NP-915 ICARUS

Icarus was the largest and most powerful hybrid engine built and tested by SRT. There are two versions distinguished by the injector design used. The engine features a light-weight composite tank (Luxfer), custom ball-valve actuation system, removable coin injector system with vortex injection, and a cubic graphite nozzle. All fittings are 304/316 Stainless Steel, while the injector and combustion chamber are made from 6061-T6 Aluminum.
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NP-915 Icarus II Engine
​Design Team: SRT-3 (2015-2016)
Build Team: SRT-3 (2015-2016)
Modified: SRT-3 (2015-2016)
                   SRT-4 (2016-2017)
                   SRT-5 (2017-2018)
Versions: I & II
Vehicle: Daedalus 

​Engine Type: Hybrid
Oxidizer: Nitrous Oxide (N2O)
Fuel: Hydroxyl-terminated polybutadiene (HTPB)
Pressurization Method: Self-pressurized
Injection Method:  Swirl Injection; Axial Injection 
​
Operating Peak Thrust: 560 lbf
Operating Impulse: 3550 lbf-sec
Operating Specific Impulse: 212 sec

Peak Thrust Prediction Efficiency: 0.95-0.99
Impulse Prediction Efficiency: 0.95-0.98

Hydrostatic Tests: 20+
Cold Flow Tests: 3
Static Engine Tests: 8