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Falcon 9

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Falcon 9
Logo of the Falcon 9
Ground-level view of a Falcon 9 lifting off from its launch pad
A Falcon 9 lifting off from Kennedy LC-39A, carrying Demo-2
FunctionMedium-lift launch vehicle
ManufacturerSpaceX
Country of originUnited States
Cost per launchUS$69.75 million (2024)[1]
Size
Height
  • FT: 69.8 m (229 ft)[2]
  • v1.1: 68.4 m (224 ft)[3]
  • v1.0: 54.9 m (180 ft)[4]
Diameter3.7 m (12 ft)[2]
Mass
  • FT: 549,000 kg (1,210,000 lb)[2]
  • v1.1: 506,000 kg (1,116,000 lb)[3]
  • v1.0: 333,000 kg (734,000 lb)[4]
Stages2
Capacity
Payload to LEO
Orbital inclination28.5°
Mass
  • FT: 22,800 kg (50,300 lb)[1] when expended,
    17,500 kg (38,600 lb)[5] when landing on drone ship
  • v1.1: 13,100 kg (28,900 lb)[3]
  • v1.0: 10,400 kg (22,900 lb)[4]
Payload to GTO
Orbital inclination27.0°
Mass
  • FT: 8,300 kg (18,300 lb) when expended,
    5,500 kg (12,100 lb) when landing on drone ship,[1]
    3,500 kg (7,700 lb) when landing at launch site[6]
  • v1.1: 4,800 kg (10,600 lb)[3]
  • v1.0: 4,500 kg (9,900 lb)[4]
Payload to Mars
MassFT: 4,020 kg (8,860 lb)[1]
Associated rockets
Based onFalcon 1
Derivative workFalcon Heavy
Launch history
Status
Launch sites
Total launches
  • 366
    • FT: 346
    • v1.1: 15
    • v1.0: 5
Success(es)
  • 363
    • FT: 345
    • v1.1: 14
    • v1.0: 4
Failure(s)2 (v1.1: CRS-7, FT Block 5: Starlink Group 9-3)
Partial failure(s)1 (v1.0: CRS-1)
Notable outcome(s)1 (FT: AMOS-6 pre-flight destruction)
Landings326 / 335 attempts
First flight
Last flight
First stage
Powered by
Maximum thrust
  • FT Block 5: 7,600 kN (1,700,000 lbf)[11]
  • FT: 6,800 kN (1,500,000 lbf)[2]
  • v1.1: 5,900 kN (1,300,000 lbf)[3]
  • v1.0: 4,900 kN (1,100,000 lbf)[4]
Specific impulse
  • v1.1 SL: 282 s (2.77 km/s)[12]
  • v1.1 vac: 311 s (3.05 km/s)[12]
  • v1.0 SL: 275 s (2.70 km/s)[4]
  • v1.0 vac: 304 s (2.98 km/s)[4]
Burn time
  • FT: 162 seconds[2]
  • v1.1: 180 seconds[3]
  • v1.0: 170 seconds
PropellantLOX / RP-1
Second stage
Powered by
Maximum thrust
  • FT regular: 934 kN (210,000 lbf)[2]
  • FT short: 840 kN (190,000 lbf)
  • v1.1: 801 kN (180,000 lbf)[3]
  • v1.0: 617 kN (139,000 lbf)[4]
Specific impulse
  • FT: 348 s (3.41 km/s)[2]
  • v1.1: 340 s (3.3 km/s)[3]
  • v1.0: 342 s (3.35 km/s)[13]
Burn time
  • FT: 397 seconds[2]
  • v1.1: 375 seconds[3]
  • v1.0: 345 seconds[4]
PropellantLOX / RP-1
[edit on Wikidata]

Falcon 9 is a partially reusable, human-rated, two-stage-to-orbit, medium-lift launch vehicle designed and manufactured in the United States by SpaceX. The first Falcon 9 launch was on 4 June 2010. The first Falcon 9 commercial resupply mission to the International Space Station (ISS) launched on 8 October 2012.[14] In 2020, it became the first commercial rocket to launch humans to orbit.[15] In 2022, it became the US rocket with the most launches in history. The Falcon 9 has an exceptional safety record,[16][17][18] with 363 successful launches, two in-flight failures, one partial failure and one pre-flight destruction.

The rocket has two stages. The first (booster) stage carries the second stage and payload to a predetermined speed and altitude, after which the second stage accelerates the payload to its target orbit. The booster is capable of landing vertically to facilitate reuse. This feat was first achieved on flight 20 in December 2015. As of 20 August 2024, SpaceX has successfully landed Falcon 9 boosters 326 times.[A] Individual boosters have flown as many as 22 flights.[19] Both stages are powered by SpaceX Merlin engines,[B] using cryogenic liquid oxygen and rocket-grade kerosene (RP-1) as propellants.[20][21]

The heaviest payloads flown to geostationary transfer orbit (GTO) were Intelsat 35e carrying 6,761 kg (14,905 lb), and Telstar 19V with 7,075 kg (15,598 lb). The former was launched into an advantageous super-synchronous transfer orbit,[22] while the latter went into a lower-energy GTO, with an apogee well below the geostationary altitude.[23] On 24 January 2021, Falcon 9 set a record for the most satellites launched by a single rocket, carrying 143 into orbit.[24]

Falcon 9 is human-rated for transporting NASA astronauts to the ISS, certified for the National Security Space Launch program[25] and the NASA Launch Services Program lists it as a "Category 3" (Low Risk) launch vehicle allowing it to launch the agency's most expensive, important, and complex missions.[26]

Several versions of Falcon 9 have been built and flown: v1.0 flew from 2010 to 2013, v1.1 flew from 2013 to 2016, while v1.2 Full Thrust first launched in 2015, encompassing the Block 5 variant, which has been in operation since May 2018.

Development history

[edit]

Conception and funding

[edit]

In October 2005, SpaceX announced plans to launch Falcon 9 in the first half of 2007.[27] The initial launch would not occur until 2010.[28]

SpaceX spent its own capital to develop and fly its previous launcher, Falcon 1, with no pre-arranged sales of launch services. SpaceX developed Falcon 9 with private capital as well, but did have pre-arranged commitments by NASA to purchase several operational flights once specific capabilities were demonstrated. Milestone-specific payments were provided under the Commercial Orbital Transportation Services (COTS) program in 2006.[29][30] The NASA contract was structured as a Space Act Agreement (SAA) "to develop and demonstrate commercial orbital transportation service",[30] including the purchase of three demonstration flights.[31] The overall contract award was US$278 million to provide three demonstration launches of Falcon 9 with the SpaceX Dragon cargo spacecraft. Additional milestones were added later, raising the total contract value to US$396 million.[32][33]

In 2008, SpaceX won a Commercial Resupply Services (CRS) contract in NASA's Commercial Orbital Transportation Services (COTS) program to deliver cargo to ISS using Falcon 9/Dragon.[33][34] Funds would be disbursed only after the demonstration missions were successfully and thoroughly completed. The contract totaled US$1.6 billion for a minimum of 12 missions to ferry supplies to and from the ISS.[35]

In 2011, SpaceX estimated that Falcon 9 v1.0 development costs were on the order of US$300 million.[36] NASA estimated development costs of US$3.6 billion had a traditional cost-plus contract approach been used.[37] A 2011 NASA report "estimated that it would have cost the agency about US$4 billion to develop a rocket like the Falcon 9 booster based upon NASA's traditional contracting processes" while "a more commercial development" approach might have allowed the agency to pay only US$1.7 billion".[38]

In 2014, SpaceX released combined development costs for Falcon 9 and Dragon. NASA provided US$396 million, while SpaceX provided over US$450 million.[39]

Congressional testimony by SpaceX in 2017 suggested that the unusual NASA process of "setting only a high-level requirement for cargo transport to the space station [while] leaving the details to industry" had allowed SpaceX to complete the task at a substantially lower cost. "According to NASA's own independently verified numbers, SpaceX's development costs of both the Falcon 1 and Falcon 9 rockets were estimated at approximately $390 million in total."[38]

Development

[edit]

SpaceX originally intended to follow its Falcon 1 launch vehicle with an intermediate capacity vehicle, Falcon 5.[40] The Falcon line of vehicles are named after the Millennium Falcon, a fictional starship from the Star Wars film series.[41] In 2005, SpaceX announced that it was instead proceeding with Falcon 9, a "fully reusable heavy-lift launch vehicle", and had already secured a government customer. Falcon 9 was described as capable of launching approximately 9,500 kilograms (20,900 lb) to low Earth orbit and was projected to be priced at US$27 million per flight with a 3.7 m (12 ft) payload fairing and US$35 million with a 5.2 m (17 ft) fairing. SpaceX also announced a heavy version of Falcon 9 with a payload capacity of approximately 25,000 kilograms (55,000 lb).[42] Falcon 9 was intended to support LEO and GTO missions, as well as crew and cargo missions to the ISS.[40]

Testing

[edit]

The original NASA COTS contract called for the first demonstration flight in September 2008, and the completion of all three demonstration missions by September 2009.[43] In February 2008, the date slipped into the first quarter of 2009. According to Musk, complexity and Cape Canaveral regulatory requirements contributed to the delay.[44]

The first multi-engine test (two engines firing simultaneously, connected to the first stage) was completed in January 2008.[45] Successive tests led to a 178-second (mission length), nine engine test-fire in November 2008.[46] In October 2009, the first flight-ready all-engine test fire was at its test facility in McGregor, Texas. In November, SpaceX conducted the initial second stage test firing, lasting forty seconds. In January 2010, a 329-second (mission length) orbit-insertion firing of the second stage was conducted at McGregor.[47]

The elements of the stack arrived at the launch site for integration at the beginning of February, 2010.[48] The flight stack went vertical at Space Launch Complex 40, Cape Canaveral,[49] and in March, SpaceX performed a static fire test, where the first stage was fired without launch. The test was aborted at T−2 due to a failure in the high-pressure helium pump. All systems up to the abort performed as expected, and no additional issues needed addressing. A subsequent test on 13 March fired the first-stage engines for 3.5 seconds.[50]

Production

[edit]
See also: List of Falcon 9 first-stage boosters

In December 2010, the SpaceX production line manufactured a Falcon 9 (and Dragon spacecraft) every three months.[51] By September 2013, SpaceX's total manufacturing space had increased to nearly 93,000 m2 (1,000,000 sq ft), in order to support a production capacity of 40 rocket cores annually.[52] The factory was producing one Falcon 9 per month as of November 2013.[53]

By February 2016 the production rate for Falcon 9 cores had increased to 18 per year, and the number of first stage cores that could be assembled at one time reached six.[54]

Since 2018, SpaceX has routinely reused first stages, reducing the demand for new cores. In 2023, SpaceX performed 91 launches of Falcon 9 with only 4 using new boosters and successfully recovered the booster on all flights. The Hawthorne factory continues to produce one (expendable) second stage for each launch.

Launch history

[edit]

This section is transcluded from List of Falcon 9 and Falcon Heavy launches. (edit | history)

Rockets from the Falcon 9 family have been launched 376 times over 14 years, resulting in 373 full successes (99.2%), two in-flight failures (SpaceX CRS-7 and Starlink Group 9-3), and one partial success (SpaceX CRS-1, which delivered its cargo to the International Space Station (ISS), but a secondary payload was stranded in a lower-than-planned orbit). Additionally, one rocket and its payload AMOS-6 were destroyed before launch in preparation for an on-pad static fire test. The active version, Falcon 9 Block 5, has flown 308 times successfully.

In 2022 Falcon 9 set a new record of 60 launches (all successful) by the same launch vehicle type in a calendar year. The previous record was held by Soyuz-U, which had 47 launches (45 successful) in 1979.[55] In 2023 Falcon 9 family set a new record of 96 launches (all successful) by the same launch vehicle family in a calendar year. The previous record was held by R-7 rocket family, which had 63 launches (61 successful) in 1980.[a][56]

The first rocket version Falcon 9 v1.0 was launched five times from June 2010 to March 2013, its successor Falcon 9 v1.1 15 times from September 2013 to January 2016, and the Falcon 9 Full Thrust 346 times from December 2015 to present. The latest Full Thrust variant, Block 5, was introduced in May 2018.[57] While the Block 4 boosters were only flown twice and required several months of refurbishment, Block 5 versions were certified to sustain 10 flights and have since been recertified for 15 and then 20 flights per booster.[58] SpaceX is currently planning to further increase the Falcon re-flight certification to 40 flights per booster; the limit of 20 flights has been reached.[59]

The Falcon Heavy derivative consists of a strengthened Falcon 9 first stage as its center core, with two additional Falcon 9 first stages attached and used as boosters, both of which are fitted with an aerodynamic nosecone instead of a usual Falcon 9 interstage.[60]

Falcon 9 first-stage boosters landed successfully in 341 of 352 attempts (96.9%), with 316 out of 320 (98.8%) for the Falcon 9 Block 5 version. A total of 311 re-flights of first stage boosters have all successfully launched their payloads.

Rocket configurations

[edit]
10
20
30
40
50
60
70
80
90
100

Launch sites

[edit]
10
20
30
40
50
60
70
80
90
100
'10
'11
'12
'13
'14
'15
'16
'17
'18
'19
'20
'21
'22
'23
'24

Launch outcomes

[edit]
25
50
75
100
125
150
'10
'11
'12
'13
'14
'15
'16
'17
'18
'19
'20
'21
'22
'23
'24
  •   Loss before launch
  •   Loss during flight
  •   Partial failure
  •   Success (commercial and government)
  •   Success (Starlink)
  •   Planned (commercial and government)
  •   Planned (Starlink)

Booster landings

[edit]
25
50
75
100
125
150
'10
'11
'12
'13
'14
'15
'16
'17
'18
'19
'20
'21
'22
'23
'24
  •   Ground-pad failure
  •   Drone-ship failure
  •   Ocean test failure[i]
  •   Parachute test failure[ii]
  •   Ground-pad success
  •   Drone-ship success
  •   Ocean test success[iii]
  •   No attempt
  1. ^ Controlled descent; ocean touchdown control failed; no recovery
  2. ^ Passive reentry failed before parachute deployment
  3. ^ Controlled descent; soft vertical ocean touchdown; no recovery

Notable flights and payloads

[edit]
See also: Notable launches of Falcon 9 and Falcon Heavy
SpaceX Falcon 9 launch with COTS Demo Flight 1
Falcon 9 flight 20 historic first-stage landing at Cape Canaveral, Landing Zone 1, on 21 December 2015
  • Flight 1, Dragon Spacecraft Qualification Unit — 4 June 2010, first flight of Falcon 9 and first test of Dragon,
  • Flight 3, Dragon C2+ — first cargo delivery to the International Space Station,
  • Flight 4, CRS-1 — first operational cargo mission to the ISS, and the first demonstration of the rocket's engine-out capability due to the failure of a first-stage Merlin engine,
  • Flight 6, CASSIOPE — first v1.1 rocket, first launch from Vandenberg AFB, first attempt at propulsive return of the first stage,
  • Flight 7, SES-8 — first launch to geosynchronous transfer orbit (GTO), first non-governmental payload,
  • Flight 9, CRS-3 — added landing legs, first fully controlled descent and vertical ocean touchdown,
  • Flight 15, Deep Space Climate Observatory (DSCOVR) — first mission injecting spacecraft into Sun–Earth L1 point,
  • Flight 19, CRS-7 — total loss of mission due to structural failure and helium overpressure in the second stage,
  • Flight 20, Orbcomm OG-2 — first vertical landing of an orbital-class rocket booster,
  • Flight 23, CRS-8 — first landing vertically achieved on an autonomous spaceport drone ship at sea,
  • AMOS-6 — total vehicle and payload loss prior to static fire test (would have been Flight 29),
  • Flight 30, CRS-10 — first launch from LC-39A at the Kennedy Space Center,
  • Flight 32, SES-10 — first reflight of a previously flown orbital class booster (B1021, previously used for SpaceX CRS-8), first recovery of a fairing,[61][62]
  • Flight 41, X-37B OTV-5 — first launch of a spaceplane,
  • Flight 54 Bangabandhu-1 — first flight of the Block 5 version,
  • Flight 58 Telstar 19V — heaviest communications satellite delivered to GEO, at the time,[63][C]
  • Flight 69 Crew Dragon Demo-1 — first launch of the Crew Dragon (did not carry astronauts),
  • Flight 72, RADARSAT Constellation — most valuable commercial payload put into orbit,[65][66][67]
  • Flight 81 — Starlink launch, was a successful flight, but had the first recovery failure of a previously flown and recovered booster,
  • Flight 83 — successful Starlink launch, saw the first failure of a Merlin 1D first-stage engine during ascent, and the second ascent engine failure on the rocket following CRS-1 on flight 4,
  • Flight 85, Crew Dragon Demo-2 — first crewed launch of the Crew Dragon, carrying two astronauts,
  • Flight 98, Crew-1 — first crewed operational launch of the Crew Dragon, holding the record for the longest spaceflight by a US crew vehicle,
  • Flight 101, CRS-21 — first launch of the Cargo Dragon 2, an uncrewed variant of the Crew Dragon,
  • Flight 106, Transporter-1 — first dedicated smallsat rideshare launch arranged by SpaceX,[D] set the record of the most satellites launched on a single launch with 143 satellites, surpassing the previous record of 108 satellites held by the November 17, 2018 launch of an Antares,
  • Flight 108 — routine Starlink launch which experienced early shut-down of a first-stage Merlin 1D engine during ascent due to damage, but still delivered the payload to the target orbit,
  • Flight 126, Inspiration4 — first orbital spaceflight of an all-private crew,
  • Flight 129, DART — first planetary defense mission against near-Earth objects,
  • Flight 134, CRS-24 — 100th successful vertical landing of an orbital-class rocket, on the sixth anniversary of the first landing in 2015,
  • Flight 232 — 200th overall successful booster landing,
  • Flight 236 — first launch with a fairing half flying for the tenth time,[68]
  • Flight 300 — 200th consecutive successful vertical landing for the orbital class Falcon booster,
  • Flight 323 — B1062 becomes the first Falcon 9 booster to fly and land 20 times; this was preceded by certification of boosters to fly that often, double the initial goal,[69]
  • Flight 328 — 300th consecutive successful Falcon 9 mission.
  • Flight 354 — Starlink Group 9–3 — Second stage failed to relight, Starlink satellites deployed into lower orbit than planned. This resulted in loss of all 20 Starlink satellites.[70]

Notable payloads

[edit]

Design

[edit]

F9 is a two-stage, LOX/RP-1-powered launch vehicle.

Specifications

[edit]
First stage
Height 41.2 m / 135.2 ft
Height (with interstage) 47.7 m / 156.5 ft
Diameter 3.7 m / 12 ft
Empty Mass 25,600 kg / 56,423 lb
Propellant Mass 395,700 kg/ 872,369 lb
Structure Type LOX tank: monocoque
Fuel tank: skin and stringer
Structure Material Aluminum lithium skin; aluminum domes
Landing Legs Number: 4
Material: carbon fiber; aluminum honeycomb
Number of Merlin Engines 9 sea level
Propellant LOX / RP-1
Thrust at Sea Level 7,607 kN / 1,710,000 lbf
Thrust in Vacuum 8,227 kN / 1,849,500 lbf
Specific Impulse (sea-level) 283 sec.
Specific Impulse (vacuum sec) 312 sec.
Burn Time 162 sec.
Ascent Attitude Control – Pitch, Yaw Gimbaled engines
Ascent Attitude Control – Roll Gimbaled engines
Coast/Descent Attitude Control Nitrogen gas thrusters and grid fins
Second stage
Height 13.8 m / 45.3 ft
Diameter 3.7 m / 12.1 ft
Empty Mass 3,900 kg / 8,598 lb
Propellant Mass 92,670 kg / 204,302 lb
Structure Type LOX tank: monocoque
Fuel tank: skin and stringer
Structure Material Aluminum lithium skin; aluminum domes
Number of Merlin Engines 1 vacuum
Propellant LOX / RP-1
Thrust 981 kN / 220,500 lbf
Specific Impulse (vacuum) 348 sec
Burn Time 397 sec
Ascent Attitude Control – Pitch, Yaw Gimbaled engine and nitrogen gas thrusters
Ascent Attitude Control – Roll Nitrogen gas thrusters
Coast/Descent Attitude Control Nitrogen gas thrusters

Engine

[edit]
Main article: SpaceX Merlin
Interactive 3D model of the Falcon 9
Interactive 3D model of the Falcon 9, fully integrated on the left and in exploded view on the right

Both stages are equipped with Merlin 1D rocket engines. Every Merlin engine produces 854 kN (192,000 lbf) of thrust.[71] They use a pyrophoric mixture of triethylaluminum-triethylborane (TEA-TEB) as an engine igniter.[72]

The booster stage has 9 engines, arranged in a configuration that SpaceX calls Octaweb.[73] The second stage of the Falcon 9 has 1 short or regular nozzle, Merlin 1D Vacuum engine version.

Falcon 9 is capable of losing up to 2 engines and still complete the mission by burning the remaining engines longer.

Each Merlin rocket engine is controlled by three voting computers, each having 2 CPUs which constantly check the other 2 in the trio. The Merlin 1D engines can vector thrust to adjust trajectory.

Tanks

[edit]

The propellant tank walls and domes are made from an aluminum–lithium alloy. SpaceX uses an all friction-stir welded tank, for its strength and reliability.[4] The second stage tank is a shorter version of the first stage tank. It uses most of the same tooling, material, and manufacturing techniques.[4]

The F9 interstage, which connects the upper and lower stages, is a carbon-fibre aluminium-core composite structure that holds reusable separation collets and a pneumatic pusher system. The original stage separation system had twelve attachment points, reduced to three for v1.1.[74]

Fairing

[edit]

Falcon 9 uses a payload fairing (nose cone) to protect (non-Dragon) satellites during launch. The fairing is 13 m (43 ft) long, 5.2 m (17 ft) in diameter, weighs approximately 1900 kg, and is constructed of carbon fiber skin overlaid on an aluminum honeycomb core.[75] SpaceX designed and fabricates fairings in Hawthorne. Testing was completed at NASA's Plum Brook Station facility in spring 2013 where the acoustic shock and mechanical vibration of launch, plus electromagnetic static discharge conditions, were simulated on a full-size test article in a vacuum chamber.[76] Since 2019, fairings are designed to re-enter the Earth's atmosphere and are reused for future missions.

Control systems

[edit]

SpaceX uses multiple redundant flight computers in a fault-tolerant design. The software runs on Linux and is written in C++.[77] For flexibility, commercial off-the-shelf parts and system-wide radiation-tolerant design are used instead of rad-hardened parts.[77] Each stage has stage-level flight computers, in addition to the Merlin-specific engine controllers, of the same fault-tolerant triad design to handle stage control functions. Each engine microcontroller CPU runs on a PowerPC architecture.[78]

Legs/fins

[edit]

Boosters that will be deliberately expended do not have legs or fins. Recoverable boosters include four extensible landing legs attached around the base.[79]

To control the core's descent through the atmosphere, SpaceX uses grid fins that deploy from the vehicle[80] moments after stage separation.[81] Initially, the V1.2 Full Thrust version of the Falcon 9 were equipped with grid fins made from aluminum, which were eventually replaced by larger, more aerodynamically efficient, and durable titanium fins. The upgraded titanium grid fins, cast and cut from a single piece of titanium, offer significantly better maneuverability and survivability from the extreme heat of re-entry than aluminum grid fins and can be reused indefinitely with minimal refurbishment.[82][83][84]

Versions

[edit]
Falcon 9 rocket family; from left to right: Falcon 9 v1.0, v1.1, Full Thrust and Block 5. Also seen are the various configurations; reusable with capsule, reusable with payload fairing and expendable with payload fairing.

The Falcon 9 has seen five major revisions: v1.0, v1.1, Full Thrust (also called Block 3 or v1.2), Block 4, and Block 5.

V1.0 flew five successful orbital launches from 2010 to 2013. The much larger V1.1 made its first flight in September 2013. The demonstration mission carried a small 500 kg (1,100 lb) primary payload, the CASSIOPE satellite.[74] Larger payloads followed, starting with the launch of the SES-8 GEO communications satellite.[85] Both v1.0 and v1.1 used expendable launch vehicles (ELVs). The Falcon 9 Full Thrust made its first flight in December 2015. The first stage of the Full Thrust version was reusable. The current version, known as Falcon 9 Block 5, made its first flight in May 2018.

V1.0

[edit]
Main article: Falcon 9 v1.0
A Falcon 9 v1.0 being launched with a Dragon spacecraft to deliver cargo to the ISS in 2012

F9 v1.0 was an expendable launch vehicle developed from 2005 to 2010. It flew for the first time in 2010. V1.0 made five flights, after which it was retired. The first stage was powered by nine Merlin 1C engines arranged in a 3 × 3 grid. Each had a sea-level thrust of 556 kN (125,000 lbf) for a total liftoff thrust of about 5,000 kN (1,100,000 lbf).[4] The second stage was powered by a single Merlin 1C engine modified for vacuum operation, with an expansion ratio of 117:1 and a nominal burn time of 345 seconds. Gaseous N2 thrusters were used on the second-stage as a reaction control system (RCS).[86]

Early attempts to add a lightweight thermal protection system to the booster stage and parachute recovery were not successful.[87]

In 2011, SpaceX began a formal development program for a reusable Falcon 9, initially focusing on the first stage.[81]

V1.1

[edit]
Main article: Falcon 9 v1.1
Falcon 9 v1.0 (left) and v1.1 (right) engine configurations
The launch of the first Falcon 9 v1.1 from Vandenberg SLC-4 (Falcon 9 Flight 6) in September 2013


V1.1 is 60% heavier with 60% more thrust than v1.0.[74] Its nine (more powerful) Merlin 1D engines were rearranged into an "octagonal" pattern[88][89] that SpaceX called Octaweb. This is designed to simplify and streamline manufacturing.[90][91] The fuel tanks were 60% longer, making the rocket more susceptible to bending during flight.[74]

The v1.1 first stage offered a total sea-level thrust at liftoff of 5,885 kN (1,323,000 lbf), with the engines burning for a nominal 180 seconds. The stage's thrust rose to 6,672 kN (1,500,000 lbf) as the booster climbed out of the atmosphere.[3]

The stage separation system was redesigned to reduce the number of attachment points from twelve to three,[74] and the vehicle had upgraded avionics and software.[74]

These improvements increased the payload capability from 9,000 kg (20,000 lb) to 13,150 kg (28,990 lb).[3] SpaceX president Gwynne Shotwell stated the v1.1 had about 30% more payload capacity than published on its price list, with the extra margin reserved for returning stages via powered re-entry.[92]

Development testing of the first stage was completed in July 2013,[93][94] and it first flew in September 2017.

The second stage igniter propellant lines were later insulated to better support in-space restart following long coast phases for orbital trajectory maneuvers.[95] Four extensible carbon fiber/aluminum honeycomb landing legs were included on later flights where landings were attempted.[96][97][98]

SpaceX pricing and payload specifications published for v1.1 as of March 2014 included about 30% more performance than the published price list indicated; SpaceX reserved the additional performance to perform reusability testing. Many engineering changes to support reusability and recovery of the first stage were made for v1.1.

Full Thrust

[edit]
Main article: Falcon 9 Full Thrust
A close-up of the newer titanium grid fins first flown for the second Iridium NEXT mission in June 2017

The Full Thrust upgrade (also known as FT, v1.2 or Block 3),[99][100] made major changes. It added cryogenic propellant cooling to increase density allowing 17% higher thrust, improved the stage separation system, stretched the second stage to hold additional propellant, and strengthened struts for holding helium bottles believed to have been involved with the failure of flight 19.[101] It offered a reusable first stage. Plans to reuse the second-stage were abandoned as the weight of a heat shield and other equipment would reduce payload too much.[102] The reusable booster was developed using systems and software tested on the Falcon 9 prototypes.

The Autonomous Flight Safety System (AFSS) replaced the ground-based mission flight control personnel and equipment. AFSS offered on-board Positioning, Navigation and Timing sources and decision logic. The benefits of AFSS included increased public safety, reduced reliance on range infrastructure, reduced range spacelift cost, increased schedule predictability and availability, operational flexibility, and launch slot flexibility".[103]

FT's capacity allowed SpaceX to choose between increasing payload, decreasing launch price, or both.[104]

Its first successful landing came in December 2015[105] and the first reflight in March 2017.[106] In February 2017, CRS-10 launch was the first operational launch utilizing AFSS. All SpaceX launches after 16 March used AFSS. A 25 June mission carried the second batch of ten Iridium NEXT satellites, for which the aluminum grid fins were replaced by larger titanium versions, to improve control authority, and heat tolerance during re-entry.[82]

Block 4

[edit]

In 2017, SpaceX started including incremental changes to the Full Thrust, internally dubbed Block 4.[107] Initially, only the second stage was modified to Block 4 standards, flying on top of a Block 3 first stage for three missions: NROL-76 and Inmarsat-5 F5 in May 2017, and Intelsat 35e in July 2017.[108] Block 4 was described as a transition between the Full Thrust v1.2 Block 3 and Block 5. It includes incremental engine thrust upgrades leading to Block 5.[109] The maiden flight of the full Block 4 design (first and second stages) was the SpaceX CRS-12 mission on 14 August.[110]

Block 5

[edit]
Main article: Falcon 9 Block 5

In October 2016, Musk described Block 5 as coming with "a lot of minor refinements that collectively are important, but uprated thrust and improved legs are the most significant".[111] In January 2017, Musk added that Block 5 "significantly improves performance and ease of reusability".[112] The maiden flight took place on 11 May 2018,[113] with the Bangabandhu Satellite-1 satellite.[114]

Capabilities

[edit]

Performance

[edit]
Version v1.0 (retired) v1.1 (retired) Full Thrust[8]
Block 3 and Block 4 (retired) Block 5 (active)[115][116]
Stage 1 engines 9 × Merlin 1C 9 × Merlin 1D 9 × Merlin 1D (upgraded)[117] 9 × Merlin 1D (upgraded)
Stage 2 engines 1 × Merlin 1C Vacuum 1 × Merlin 1D Vacuum 1 × Merlin 1D Vacuum (upgraded)[100][117] 1 × Merlin 1D Vacuum (upgraded) (short or regular nozzle)
Max. height (m) 53[118] 68.4[3] 70[2][100] 70
Diameter (m) 3.66[119] 3.66[120] 3.66[100] 3.66
Initial thrust 3.807 MN (388.2 tf) 5.9 MN (600 tf)[3] 6.804 MN (693.8 tf)[2][100] 7.6 MN (770 tf)[121]
Takeoff mass 318 t (701,000 lb)[118] 506 t (1,116,000 lb)[3] 549 t (1,210,000 lb)[2] 549 t (1,210,000 lb)
Fairing diameter (m) —[b] 5.2 5.2 5.2
Payload to LEO (kg)
(from Cape Canaveral) 		8,500–9,000[118] 13,150[3] 22,800 (expendable)[1][c] ≥ 22,800 (expendable)
≥ 17,400 (reusable)[d]
Payload to GTO (kg) 3,400[118] 4,850[3] 8,300[1] (expendable)
About 5,300[124][125] (reusable) 		≥ 8,300 (expendable)
≥ 5,800 (reusable)[126]
Success ratio 5 / 5[e] 14 / 15[f] 36 / 36 (1 precluded)[g] 309 / 310
  1. ^ There was also an on-pad explosion; sometimes it is counted as a launch, resulting in 64 launches.
  2. ^ The Falcon 9 v1.0 only launched the Dragon spacecraft; it was never launched with the clam-shell payload fairing.
  3. ^ Payload was restricted to 10,886 kg (24,000 lb) due to structural limit of the payload adapter fitting (PAF).[122]
  4. ^ Heaviest explicitly confirmed payload has been 17,400 kg.[123]
  5. ^ On SpaceX CRS-1, the primary payload, Dragon, was successful. A secondary payload was placed in an incorrect orbit because of a changed flight profile due to the malfunction and shut-down of a single first-stage engine. Likely enough fuel and oxidizer remained on the second stage for orbital insertion, but not enough to be within NASA safety margins for the protection of the International Space Station.[127]
  6. ^ The only failed mission of the Falcon 9 v1.1 was SpaceX CRS-7, which was lost during its first stage operation due to an overpressure event in the second stage oxygen tank.
  7. ^ One rocket and payload were destroyed before launch, during preparation for a routine static fire test.

Reliability

[edit]

As of 20 August 2024, Falcon 9 had achieved 363 out of 366 full mission successes (99.2%). SpaceX CRS-1 succeeded in its primary mission, but left a secondary payload in a wrong orbit, while SpaceX CRS-7 was destroyed in flight. In addition, AMOS-6 disintegrated on the launch pad during fueling for an engine test. Block 5 has a success rate of 99.7% (309/310). For comparison, the industry benchmark Soyuz series has performed 1880 launches[128] with a success rate of 95.1% (the latest Soyuz-2's success rate is 94%),[129] the Russian Proton series has performed 425 launches with a success rate of 88.7% (the latest Proton-M's success rate is 90.1%), the European Ariane 5 has performed 117 launches with a success rate of 95.7%, and Chinese Long March 3B has performed 85 launches with a success rate of 95.3%.

F9's launch sequence includes a hold-down feature that allows full engine ignition and systems check before liftoff. After the first-stage engine starts, the launcher is held down and not released for flight until all propulsion and vehicle systems are confirmed to be operating normally. Similar hold-down systems have been used on launch vehicles such as Saturn V[130] and Space Shuttle. An automatic safe shut-down and unloading of propellant occur if any abnormal conditions are detected.[4] Prior to the launch date, SpaceX sometimes completes a test cycle, culminating in a three-and-a-half second first stage engine static firing.[131][132]

F9 has triple-redundant flight computers and inertial navigation, with a GPS overlay for additional accuracy.[4]

Engine-out capability

[edit]

Like the Saturn family of rockets, multiple engines allow for mission completion even if one fails.[4][133] Detailed descriptions of destructive engine failure modes and designed-in engine-out capabilities were made public.[134]

SpaceX emphasized that the first stage is designed for "engine-out" capability.[4] CRS-1 in October 2012 was a partial success after engine number 1 lost pressure at 79 seconds, and then shut down. To compensate for the resulting loss of acceleration, the first stage had to burn 28 seconds longer than planned, and the second stage had to burn an extra 15 seconds. That extra burn time reduced fuel reserves so that the likelihood that there was sufficient fuel to execute the mission dropped from 99% to 95%. Because NASA had purchased the launch and therefore contractually controlled several mission decision points, NASA declined SpaceX's request to restart the second stage and attempt to deliver the secondary payload into the correct orbit. As a result, the secondary payload reentered the atmosphere.[135]

Merlin 1D engines have suffered two premature shutdowns on ascent. Neither has affected the primary mission, but both landing attempts failed. On an 18 March 2020 Starlink mission, one of the first stage engines failed 3 seconds before cut-off due to the ignition of some isopropyl alcohol that was not properly purged after cleaning.[136] On another Starlink mission on 15 February 2021, hot exhaust gasses entered an engine due to a fatigue-related hole in its cover.[137] SpaceX stated the failed cover had the "highest... number of flights that this particular boot [cover] design had seen."[138]

Reusability

[edit]
Main article: SpaceX reusable launch system development program
Explanatory graphic of Falcon 9's first stage barge landing

SpaceX planned from the beginning to make both stages reusable.[139] The first stages of early Falcon flights were equipped with parachutes and were covered with a layer of ablative cork to allow them to survive atmospheric re-entry. These were defeated by the accompanying aerodynamic stress and heating.[87] The stages were salt-water corrosion-resistant.[139]

In late 2011, SpaceX eliminated parachutes in favor of powered descent.[140][141] The design was complete by February 2012.[81]

Powered landings were first flight-tested with the suborbital Grasshopper rocket.[142] Between 2012 and 2013, this low-altitude, low-speed demonstration test vehicle made eight vertical landings, including a 79-second round-trip flight to an altitude of 744 m (2,441 ft). In March 2013, SpaceX announced that as of the first v1.1 flight, every booster would be equipped for powered descent.[97]

Post-mission flight tests and landing attempts

[edit]
Main article: Falcon 9 first-stage landing tests
Falcon 9's first stage successfully landing on an ASDS for the first time, following the launch of SpaceX CRS-8 to the ISS

For Flight 6 in September 2013, after stage separation, the flight plan called for the first stage to conduct a burn to reduce its reentry velocity, and then a second burn just before reaching the water. Although not a complete success, the stage was able to change direction and make a controlled entry into the atmosphere.[143] During the final landing burn, the RCS thrusters could not overcome an aerodynamically induced spin. The centrifugal force deprived the engine of fuel, leading to early engine shutdown and a hard splashdown.[143]

After four more ocean landing tests, the CRS-5 booster attempted a landing on the ASDS floating platform in January 2015. The rocket incorporated (for the first time in an orbital mission) grid fin aerodynamic control surfaces, and successfully guided itself to the ship, before running out of hydraulic fluid and crashing into the platform.[144] A second attempt occurred in April 2015, on CRS-6. After the launch, the bipropellant valve became stuck, preventing the control system from reacting rapidly enough for a successful landing.[145]

The first attempt to land a booster on a ground pad near the launch site occurred on flight 20, in December 2015. The landing was successful and the booster was recovered.[146][147] This was the first time in history that after launching an orbital mission, a first stage achieved a controlled vertical landing. The first successful booster landing on an ASDS occurred in April 2016 on the drone ship Of Course I Still Love You during CRS-8.

Sixteen test flights were conducted from 2013 to 2016, six of which achieved a soft landing and booster recovery. Since January 2017, with the exceptions of the centre core from the Falcon Heavy test flight, Falcon Heavy USAF STP-2 mission, the Falcon 9 CRS-16 resupply mission and the Starlink-4, 5, and 19 missions,[148][149] every landing attempt has been successful. Two boosters have been lost or destroyed at sea after landing: the center core used during the Arabsat-6A mission,[150] and B1058 after completing a Starlink flight.[151]

Relaunch

[edit]
The first reflight of a Falcon 9, in March 2017

The first operational relaunch of a previously flown booster was accomplished in March 2017[152] with B1021 on the SES-10 mission after CRS-8 in April 2016.[153] After landing a second time, it was retired.[154] In June 2017, booster B1029 helped carry BulgariaSat-1 towards GTO after an Iridium NEXT LEO mission in January 2017, again achieving reuse and landing of a recovered booster.[155] The third reuse flight came in November 2018 on the SSO-A mission. The core for the mission, Falcon 9 B1046, was the first Block 5 booster produced, and had flown initially on the Bangabandhu Satellite-1 mission.[156]

In May 2021 the first booster reached 10 missions. Musk indicated that SpaceX intends to fly boosters until they see a failure in Starlink missions.[157][158] As of 20 August 2024, the record is 22 flights by the same booster.

Recovery of fairings

[edit]

SpaceX developed payload fairings equipped with a steerable parachute as well as RCS thrusters that can be recovered and reused. A payload fairing half was recovered following a soft-landing in the ocean for the first time in March 2017, following SES-10.[62] Subsequently, development began on a ship-based system involving a massive net, in order to catch returning fairings. Two dedicated ships were outfitted for this role, making their first catches in 2019.[159] However, following mixed success, SpaceX returned to water landings and wet recovery.[160]

Recovery of second stages

[edit]

Despite public statements that they would endeavor to make the second-stage reusable as well, by late 2014, SpaceX determined that the mass needed for a heat shield, landing engines, and other equipment to support recovery of the second stage was prohibitive, and abandoned second-stage reusability efforts.[102][161]

Launch sites

[edit]
Main article: SpaceX launch facilities
SpaceX's Falcon 9 rocket delivered the ABS-3A and Eutelsat 115 West B satellites to a supersynchronous transfer orbit, launching from Space Launch Complex 40 at Cape Canaveral Air Force Station, Florida in March 2015

By early 2018, F9 was regularly launching from three orbital launch sites: Launch Complex 39A of the Kennedy Space Center,[162] Space Launch Complex 4E of Vandenberg Air Force Base,[163][143] and Space Launch Complex 40 at Cape Canaveral Air Force Station. The latter was damaged in the AMOS-6 accident in September 2016, but was operational again by December 2017.[164][165]

On April 21, 2023, the United States Space Force, Space Launch Delta 30 granted SpaceX permission to lease Vandenberg Space Launch Complex 6 for Falcon 9 and Falcon Heavy launches.[166] SLC-6 is likely to become the fourth launch site for Falcon 9.

Pricing

[edit]

At the time of Falcon 9's 2010 maiden flight, the price of a v1.0 launch was listed from US$49.9–56 million.[4] The list price increased thereafter, to US$54–59.5 million (2012).[167] US$56.5 million (v1.1, August 2013),[168] US$61.2 million (June 2014),[169] US$62 million (Full Thrust, May 2016),[170] to US$67 million (2022).[1] Dragon cargo missions to the ISS have an average cost of US$133 million under a fixed-price contract with NASA, including the cost of the spacecraft.[171] The 2013 DSCOVR mission, launched with Falcon 9 for National Oceanic and Atmospheric Administration (NOAA), cost US$97 million.[172]

In 2004, Elon Musk stated, "Ultimately, I believe 500 per pound (1100/kg) [of payload delivered to orbit] or less is very achievable".[173] At its 2016 launch price with a full LEO payload, Full Thrust launch costs reached US$1,200/lb ($2,600/kg).

In 2011, Musk estimated that fuel and oxidizer for v1.0 cost about US$200,000.[174] The first stage uses 245,620 L (54,030 imp gal; 64,890 US gal) of liquid oxygen and 146,020 L (32,120 imp gal; 38,570 US gal) of RP-1 fuel,[175] while the second stage uses 28,000 L (6,200 imp gal; 7,400 US gal) of liquid oxygen and 17,000 L (3,700 imp gal; 4,500 US gal) of RP-1.[1]

By 2018, F9's decreased launch costs drew competitors. Arianespace began working on Ariane 6, United Launch Alliance (ULA) on Vulcan Centaur, and International Launch Services (ILS) on Proton Medium.[176]

On 26 June 2019, Jonathan Hofeller (SpaceX vice president of commercial sales) said that price discounts given to early customers on mission with reused boosters had become the standard price.[177] In October 2019, Falcon 9's "base price" of US$62 million per launch was lowered to US$52 million for flights scheduled in 2021 and beyond.[178]

On 10 April 2020, Roscosmos administrator Dmitry Rogozin, said that his outfit was cutting prices by 30%, alleging that SpaceX was price dumping by charging commercial customers US$60 million per flight while charging NASA between 1.5 and 4 times as much for the same flight.[179] Musk denied the claim and replied that the price difference reflected that the Falcon 9s were 80% reusable, while Russian rockets were single use.[180] ULA CEO Tory Bruno stated "Our estimate remains around 10 flights as a fleet average to achieve a consistent breakeven point ... and that no one has come anywhere close".[181] However, Elon Musk responded "payload reduction due to reusability of booster and fairing is <40% for Falcon 9 and recovery and refurb is <10%, so you're roughly even with 2 flights, definitely ahead with 3".[182] CNBC reported in April 2020 that the United States Air Force's launches were costing US$95 million due to extra security. SpaceX executive Christopher Couluris stated that reusing rockets could bring prices even lower, that it "costs 28 million to launch it, that's with everything".[182]

In 2024, it was stated that SpaceX's internal costs for launching a Falcon 9 were "significantly less than $20 million", achieved through the reuse rocket's first stage and payload fairings.[183]

Rideshare payload programs

[edit]

SpaceX provides two rideshare programs providing regularly scheduled Falcon 9 flights for small satellite deployment: Transporter and Bandwagon. The Transporter program, started in 2021, specializes in delivering payloads to sun-synchronous orbits, primarily serving Earth observation missions, with flights typically operating every four months. The Bandwagon program, started in 2024, offers access to mid-inclination orbits of approximately 45 degrees, with flights typically operating every six months.[184][185] Unlike traditional secondary payload arrangements, these programs do not rely on a primary mission. Instead, SpaceX provides a unique "cake topper" option for larger satellites between 500 and 2,500 kilograms (1,100 and 5,500 lb).[186]

SpaceX also offers more traditional rideshares where small satellites piggyback on the launch of a large primary payload.[184] In the past, the company has offered clients the option to mount payloads using the EELV Secondary Payload Adapter (ESPA) ring, the same interstage adapter first used for launching secondary payloads on US DoD missions that use the Evolved Expendable Launch Vehicles (EELV) Atlas V and Delta IV.[187]

Even though the Falcon 9 is a medium-lift launch vehicle, through these programs, SpaceX has become the leading provider of rideshare launches. Given the company's frequent launch cadence and low prices, operators of small-lift launch vehicles have found it difficult to compete.[186]

Public display of Falcon 9 vehicles

[edit]

SpaceX first put a Falcon 9 (B1019) on public display at their headquarters in Hawthorne, California, in 2016.[188]

In 2019, SpaceX donated a Falcon 9 (B1035) to Space Center Houston, in Houston, Texas. It was a booster that flew two missions, "the 11th and 13th supply missions to the International Space Station [and was] the first Falcon 9 rocket NASA agreed to fly a second time".[189][190]

In 2021, SpaceX donated a Falcon Heavy side booster (B1023) to the Kennedy Space Center Visitor Complex.[191]

In 2023, a Falcon 9 (B1021)[192] has been put on public display outside Dish Network's headquarters in Littleton, Colorado.[193]

See also

[edit]

Notes

[edit]
  1. ^ Landing success details at List of Falcon 9 and Falcon Heavy launches
  2. ^ Upper stage uses a different version of the engine, Merlin Vacuum, which is much larger due to nozzle extension, and cannot work at sea level
  3. ^ Jupiter 3/EchoStar XXIV has a larger mass, when comparing both initial mass (~9,200 kg vs. 7,076 kg) and dry mass (5,817 kg vs. 3,031 kg)[64]
  4. ^ The first dedicated smallsat rideshare launch was flight 64, SSO-A: SmallSat Express, arranged by Spaceflight, Inc. (a division Spaceflight Industries at the time). It carried two SHERPA dispencers and nothing else.

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