The turbopump used is a Merlin 1B model with only slight alterations. The Merlin 1C uses a regeneratively cooled nozzle and combustion chamber. This engine differs from the Falcon 9 first-stage variant in that it uses a larger exhaust nozzle optimized for vacuum operation and can be throttled between 60% and 100%. Finally, a Merlin 1C vacuum variant is used on the Falcon 9 second stage. The Merlin 1C engine for the Falcon 9 first stage is nearly identical to the variant used for the Falcon 1, although the turbopump exhaust assembly is not movable. The Merlin engine for Falcon 1 had a movable turbopump exhaust assembly, which was used to provide roll control by vectoring the exhaust. Three versions of the Merlin 1C engine were produced. Therefore, the Merlin 1B was never used on a launch vehicle. Due to experience from the Falcon 1's first flight, SpaceX moved its Merlin development to the Merlin 1C, which is regeneratively cooled. Initial use of the Merlin 1B was to be on the Falcon 9 launch vehicle, on whose first stage there would have been a cluster of nine of these engines. Īnother notable change over the 1A was the move to TEA– TEB ( pyrophoric) ignition over torch ignition. Turbopump weight was unchanged at 68 kg (150 lb). This model turned at a faster 22,000 rpm and developed higher discharge pressures. Slightly enlarged impellers for both RP-1 and LOX were part of the upgrade. The turbine upgrade was accomplished by adding additional nozzles, turning the previously partial-admission design to full admission. The Merlin 1B was enhanced over the 1A with a turbine upgrade, increasing power output from 1,500 kW (2,000 hp) to 1,900 kW (2,500 hp). It was intended for Falcon 1 launch vehicles, capable of producing 380 kN (85,000 lbf) of thrust at sea level and 420 kN (95,000 lbf) in vacuum, and performing with a specific impulse of 261 s (2.56 km/s) at sea level and 303 s (2.97 km/s) in vacuum. The turbopump upgrades were handled by Barber-Nichols, Inc. The Merlin 1B rocket engine was an upgraded version of the Merlin 1A engine. The turbine was a partial-admission (i.e., working fluid is only admitted through part of the rotation of the turbine an arc, not the whole circumference) impulse design and turned at up to 20,000 rpm, with a total weight of 68 kg (150 lb). The turbopump housing was constructed using investment castings, with Inconel at the turbine end, aluminum in the center, and 300-series stainless steel at the LOX end. The Merlin 1A turbopump used a unique friction-welded main shaft, with Inconel 718 ends and an integral aluminum RP-1 impeller in the middle. in 2002, who performed all design, engineering analysis, and construction the company had previously worked on turbopumps for the RS-88 (Bantam) and NASA Fastrac engine programs. The SpaceX turbopump was an entirely new, clean-sheet design contracted to Barber-Nichols, Inc. Both times the Merlin 1A was mounted on a Falcon 1 first stage. The Merlin 1A flew only twice: first on March 24, 2006, when it caught fire and failed due to a fuel leak shortly after launch, and the second time on March 21, 2007, when it performed successfully. The initial version, the Merlin 1A, used an inexpensive, expendable, ablatively cooled carbon-fiber-reinforced polymer composite nozzle and produced 340 kN (76,000 lbf) of thrust. This eliminates the need for a separate hydraulic drive system and means that thrust vectoring control failure by running out of hydraulic fluid is not possible. The turbopump also provides high-pressure fluid for the hydraulic actuators, which then recycles into the low-pressure inlet. Propellants are fed by a single-shaft, dual- impeller turbopump. The injector at the heart of Merlin is of the pintle type that was first used in the Apollo Lunar Module landing engine ( LMDE). The Merlin engine was originally designed for sea recovery and reuse, but since 2016 the entire Falcon 9 booster is recovered for reuse by landing vertically on a landing pad using one of its nine Merlin engines. Merlin engines use RP-1 and liquid oxygen as rocket propellants in a gas-generator power cycle. Merlin is a family of rocket engines developed by SpaceX for use on its Falcon 1, Falcon 9 and Falcon Heavy launch vehicles.
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