Falcon (rocket family)
The Falcon rocket family is a set of launch vehicles developed and operated by Space Exploration Technologies (SpaceX). The vehicles in this family include the flight-tested Falcon 1 and Falcon 9. The Falcon 1 made its first successful flight on 28 September 2008, after several failures on the initial attempts. The larger Evolved Expendable Launch Vehicle (EELV)-class Falcon 9 flew successfully into orbit on its maiden launch on 4 June 2010. The Falcon 9 is eventually intended to be a reusable vehicle. SpaceX is currently in production of the first Falcon Heavy launch system. Other designs for boosters with even larger payload lifting capabilities are currently being researched, but have not yet been funded.
Current launch vehicles 
Falcon 9 
On 8 September 2005, SpaceX announced the development of the Falcon 9 rocket, which has nine Merlin engines in its first stage. The design is an EELV-class vehicle, intended to compete with the Delta IV and the Atlas V rockets. Both stages were designed for reuse. A similarly designed Falcon 5 rocket was also envisioned to fit between the Falcon 1 and Falcon 9, but development was dropped to concentrate on the Falcon 9.
The company purchased the McGregor, Texas, testing facilities of defunct Beal Aerospace, where it refitted the largest test stand at the facilities for Falcon 9 testing. On 22 November 2008, the stand tested the nine Merlin 1C engines of the Falcon 9, which deliver 350 metric-tons-force (3.4-meganewtons) of thrust, well under the stand's capacity of 1,500 metric-tons-force (15 meganewtons).
The first Falcon 9 vehicle was integrated at Cape Canaveral on 30 December 2008. NASA was planning for a flight to take place in January 2010; however the maiden flight was postponed several times and took place on 4 June 2010. At 2:50pm EST the Falcon 9 rocket successfully reached orbit.
The second flight for the Falcon 9 vehicle was the COTS Demo Flight 1, the first launch under the NASA Commercial Orbital Transportation Services (COTS) contract designed to provide "seed money" for development of new boosters. The original NASA contract called for the COTS Demo Flight 1 to occur the second quarter of 2008; this flight was delayed several times, occurring at 1543 GMT on 8 December 2010. The rocket successfully deployed an operational Dragon spacecraft at 1553 GMT. Dragon orbited the Earth twice, and then made a controlled reentry burn that put it on target for a splashdown in the Pacific Ocean off the coast of Mexico. With Dragon's safe recovery, SpaceX became the first private company to launch, orbit, and recover a spacecraft; prior to this mission, only government agencies had been able to recover orbital spacecraft.
Falcon 1 
The Falcon 1 is a small, partially reusable rocket capable of placing several hundred kilograms into low earth orbit. It also functioned as a testbed for developing concepts and components for the larger Falcon 9. Initial Falcon 1 flights were launched from the US government's Reagan Test Site on the island atoll of Kwajalein in the Pacific Ocean, and represented the first attempt to fly a ground-launched rocket to orbit from that site.
On 26 March 2006, the Falcon 1's maiden flight failed only seconds after leaving the pad due to a fuel line rupture. After a year, the second flight was launched on 22 March 2007 and it also ended in failure, due to a spin stabilization problem that automatically caused sensors to turn off the Merlin 2nd stage engine. The third Falcon 1 flight used a new regenerative cooling system for the first stage Merlin engine, and the engine development was responsible for the almost 17-month flight delay. The new cooling system turned out to be the major reason the mission failed; because the first stage rammed into the second stage engine bell at staging, due to excess thrust provided by residual propellant left over from the higher-propellant-capacity cooling system. On 28 September 2008, the Falcon 1 succeeded in reaching orbit on its fourth attempt, becoming the first privately funded, liquid-fueled rocket to do so. The Falcon 1 carried its first and only successful commercial payload into orbit on 13 July 2009, on its fifth launch. No launch attempts of the Falcon 1 have been made since 2009, and SpaceX is not currently taking launch reservations for the Falcon 1 in order to concentrate company resources on its larger Falcon 9 launch vehicle and other development projects.
Falcon 1e 
The Falcon 1e is an upgraded version of the Falcon 1 with a larger fairing and payload mass, and is 6.1 metres (20 ft) longer than the Falcon 1. By December 2010, Falcon 1e replaced the services of Falcon 1 on the SpaceX product list.
The 1e version has not yet been flown and is not currently scheduled to make a flight. Continued development and use of the Falcon 1/1e have been stagnant while the company focuses on the Falcon 9/Dragon program.
Falcon 5 
Falcon 9 Air 
In December 2011 Stratolaunch Systems announced that it would contract with SpaceX to develop an air-launched, multiple-stage launch vehicle, as a derivative of Falcon 9 technology, called the Falcon 9 Air, as part of the Stratolaunch project. On 27 November 2012 Stratolaunch announced that they will partner with Orbital Sciences Corporation instead of SpaceX, effectively ending development of the Falcon 9 Air.
Under development 
Falcon Heavy 
SpaceX is currently building the first vehicle of a Heavy configuration, using a cluster of three Falcon 9 v1.1 first stages with 27 uprated Merlin 1D engines and propellant crossfeed. SpaceX is aiming for the first demo flight of the Falcon Heavy in 2013.[not in citation given]
Reusable rocket launching system 
SpaceX is developing a set of reusable orbital launch system technologies that will bring a first stage back to the launch site in minutes — and a second stage back to the launch pad, following orbital realignment with the launch site and atmospheric reentry, in up to 24 hours — with both stages designed to be available for reuse within "single-digit hours" after return.
Design was complete on the system for "bringing the rocket back to launchpad using only thrusters" in February 2012. The reusable launch system technology is under consideration for both the Falcon 9 and the Falcon Heavy, and is considered particularly well suited to the Falcon Heavy where the two outer cores separate from the rocket much earlier in the flight profile, and are therefore moving at slower velocity at stage separation.
The reusable launch system was initially announced on 29 September 2011. SpaceX indicated that they would attempt to develop powered descent and recovery of both Falcon 9 stages – a fully vertical takeoff, vertical landing (VTVL) rocket.  Included was a video said to be an approximation depicting the first stage returning tail-first for a powered descent and the second stage, with heat shield, reentering head first before rotating for a powered descent. A reusable first stage is now being flight tested by SpaceX with the suborbital Grasshopper rocket.
In March 2013, SpaceX announced that, beginning with the first flight of the stretch version of the Falcon 9 launch vehicle—the sixth flight overall of Falcon 9, currently scheduled for June 2013—every first stage would be instrumented and equipped as a controlled descent test vehicle. SpaceX intends to do propulsive-return over-water tests and "will continue doing such tests until they can do a return to the launch site and a powered landing. ... [They expect several failures before they 'learn how to do it right.'" For the early-summer 2013 flight, after stage separation, the first stage booster will do a burn to slow it down and then a second burn just before it reaches the water. When all of the over-water testing is complete, they intend to fly back to the launch site and land propulsively, perhaps as early as mid-2014. SpaceX has been explicit that they do not expect a successful recovery in the first several powered-descent tests. 
Grasshopper is an experimental technology-demonstrator, suborbital reusable launch vehicle (RLV), a vertical takeoff, vertical landing (VTVL) rocket being built in 2011 for low-altitude testing scheduled to begin in 2012. The initial test vehicle "consists of a Falcon 9 first stage tank, a single Merlin-1D engine, four steel landing legs and a support structure, plus other pressurization tanks attached to the support structure" and will stand at 106 feet (32 m) tall. Beginning in October 2012, SpaceX discussed development of a second-generation Grasshopper test vehicle, one that would have lighter-weight landing legs that fold up on the side of the rocket, would have a different engine bay, and would be nearly 50% longer than the first Grasshopper vehicle.
A multiphase, multiyear flight test program is underway for low-altitude flights up to 11,500 feet (3,500 m), for durations of up to 160 seconds (2.7 min). SpaceX "constructed a half-acre concrete launch facility" to support the Grasshopper test flight program.
SpaceX projected it would begin its flight test program in 2012, and did so. Grasshopper began flight testing in September 2012 with a brief, three-second hop at the company's Texas test site, followed by a second hop in November 2012 with an 8-second flight that took the testbed approximately 5.4 metres (18 ft) off the ground, and a third flight in December 2012 of 29 seconds duration, with extended hover under rocket engine power, in which it ascended to an altitude of 40 metres (130 ft). A fourth test was completed in March 2013, with details yet to be released by SpaceX.
Future concepts 
Merlin 2 and conceptual super-heavy lift vehicles 
In a presentation to the Joint Propulsion Conference in July 2010, SpaceX revealed preliminary, but unfunded, design concepts for a larger Merlin 2 engine which could conceivably replace the nine engine cluster used on the Falcon 9 and Falcon Heavy cores.
As of July 2010[update], the Merlin 2 could also be used on conceptual super heavy-lift launch vehicles Falcon X, Falcon X Heavy, and Falcon XX. The Falcon X could use three Merlin 2 engines, the Falcon X Heavy scaling up by tripling the first stage cores, and the Falcon XX would be an even larger in-line configuration with six Merlin 2 engines.
By mid-August 2010, SpaceX CEO Elon Musk clarified that while the Merlin 2 engine architecture was a key element of any effort they would make toward their objective of "super-heavy lift" launch vehicles, the potential launch vehicle design configurations shown by Markusic at the propulsion conference were merely conceptual "brainstorming ideas", just a "bunch of ideas for discussion," and not financed SpaceX projects.
|Merlin 2 Conceptual Launch Vehicles (2010)||F9 with Merlin 21||F9H with Merlin 21||Falcon X||Falcon X Heavy||Falcon XX|
|M2 Engines per core||1||1||3||3||6|
|Total thrust (MN)||5.3||16||16||48||45|
|Mass to LEO (tonnes)||11.5||34.0||38.0||125.0||140.0|
1Conceptual Merlin 2 versions, unrelated to normal Falcon 9 and Falcon Heavy.
"Spacex talks Falcon X Heavy for 125 tons of heavy lift and Falcon XX for 140 tons and Nuclear Thermal interplanetary Rockets". 2010-08-06. Retrieved 2012-12-26.</ref>
Launch vehicle comparisons 
|Launcher Versions||Falcon 1||Falcon 1e||Falcon 9v1.0||Falcon 9v1.1||Falcon Heavy|
|Stage 0||—||—||—||—||2 boosters with 9 × Merlin 1D each; optional propellant crossfeed for increased launch mass capability|
|Stage 1||1 × Merlin 1A (2006–2007);||1 × Merlin 1C||9 × Merlin 1C||9 × Merlin 1D||9 × Merlin 1D|
|Stage 2||1 × Kestrel||1 × Kestrel||1 × Merlin Vacuum||1 × Merlin Vacuum||1 × Merlin Vacuum|
|1.5||1.71||3.61 or 5.21||3.61 or 5.21||5.21|
|2006: 6.7 
2007: 7.0 
2008: 7.9 
|2007: 8.5 
2008: 9.1 
2010: 10.9 
|2005: 27 with 3.6m fairing, 35 with 5.2m fairing to LEO
2009: 44 to LEO or 49.5 to GTO 
2011: 54 to 59.5
|—||2011:80 to 124 |
|—||—||—||54 ||83 [Up to 6.4 ton to GTO] 
128 [Greater than 6.4 ton to GTO] 
1precise diameters are 12 feet (approximately 3.66 meters) and 17 feet (approximately 5.18 meters) (rounded for aesthetics)
See also 
- Dragon (spacecraft): A reusable space vehicle designed for operation with the Falcon 9.
- SpaceX rocket engine family, including:
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- Falcon 1 overview on SpaceX company website
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- Falcon Heavy overview on SpaceX company website
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