Scaled Composites conducted a fourth test of the engine for its SpaceShipTwo vehicle on March 30, according to a log on the company’s website. The “full scale flight design RM2 hot-fire” was the first test done since May 20 of last year – a 10-month gap.
The test log says the firing was a success:
All objectives completed. Performed successful hot-fire, including oxidizer flow and pressurization systems, data acquisition system measurements, structural evaluation, nozzle ablation, and fuel regression rate data collection. Determined stability levels.








