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82 degree star shape rocket motor12/24/2023 īy December 2011, 21 full-scale hot-fire ground tests had been carried out on RocketMotorTwo. News reports in early 2009 reported that the hot fire tests had been "completed" and that Spacedev (later acquired by Sierra Nevada Corporation) had been contracted by Scaled Composites to assist Scaled in developing SS2. Scaled Composites performed a series of subscale rocket hot-firings between June 2005 and April 2009, before choosing a full-scale rocket motor design. Three Scaled employees were killed and three injured, two critically and one seriously, by flying shrapnel when the nitrous oxide oxidizer spontaneously ignited and exploded (dissociation into N2 and O components, releasing energy). The test did not ignite the engine and no solid rocket fuel was involved. The test included filling the oxidizer tank with 4,500 kg (9,900 lb) of nitrous oxide, followed by a 15-second cold flow injector test. On 26 July 2007, during the early vehicle subsystem testing phase, an explosion occurred during a propellant flow test by Scaled Composites at the Mojave Air and Space Port. Sierra Nevada is also developing a similar hybrid engine, the Dream Chaser rocket engine. The company also developed the rocket engine for the first private spacecraft to reach space, SpaceShipOne, which won the Ansari X-Prize in 2004. Background Īs of March 2013, Sierra Nevada had performed over 300 hybrid rocket test firings. The design makes use of lessons learned during the development of the SpaceShipOne hybrid rocket motor. RocketMotorTwo is a hybrid rocket engine utilizing solid hydroxyl-terminated polybutadiene (HTPB) fuel and liquid nitrous oxide oxidizer – sometimes referred to as an N 2O/ HTPB motor – providing 70,000 pounds-force (310 kN) of thrust. 3.3.2 Related airframe and subsystem modifications to support the new engine.3.2.2 Extended delays in flight testing.The second-generation engine is now made in-house by Virgin Galactic rather than by SNC. It experimented with using a polyamide plastic fuel and nitrous oxide oxidizer in 2014, but switched back to using its original hydroxyl-terminated polybutadiene (HTPB) fuel and liquid nitrous oxide oxidizer in 2015. The second-generation RocketMotorTwo engine is a variant of the earlier SNC basic design. SNC was a subcontractor to Scaled Composites through May 2014 when their involvement in the program ended after Virgin Galactic elected to replace SNC's version of RocketMotorTwo powered by HTPB rubber fuel, with its own internally developed hybrid motor for SpaceShipTwo. ![]() This engine design was subsequently flown in only two additional flight tests during 2013 and January 2014. It was first ignited in flight during a SpaceShipTwo test launch in April 2013. The first-generation engine was developed by Sierra Nevada Corporation (SNC), from the late 2000s to May 2014. RocketMotorTwo ( RM2) is a family of hybrid rocket engines developed for the Scaled Composites SpaceShipTwo suborbital spaceplane. Nitrous oxide / Hydroxyl-terminated polybutadiene Family of hybrid rocket engines RocketMotorTwo Country of origin
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