Aerotech J615ST-20A

The J615 is the first high-power hobby rocket motor featuring an “Aerospike” nozzle and designed to use the two-grain RMS-54/852 hardware.Theoretically, an Aerospike nozzle expands the rocket motor exhaust gases around a centre body rather than internally in the exit cone of a conventional nozzle. Aerospike nozzles have the advantage of being self-adjusting to the rocket’s ambient pressure in flight and therefore can be more efficient than a traditional fixed-expansion ratio nozzle when used at a wide range of altitudes. In consumer applications, however, the Aerospike nozzle is utilized more for its unique appearance and novelty rather than for performance reasons. The Aerospike nozzle does produce a rather novel exhaust plume.

Specs:

Profile: RMS (Reloadable Motor System)
Propellant: Super Thunder (burn rate between Blue Thunder and Warp 9)
Diameter: 54 mm
Delays: 4,8,12,16,20 (adjustable using the Universal Delay Drilling Adaptor)
Length: 240 mm
Total Weight: 802 g
Prop. Weight: 371 g
Avg. Thrust: 615.1 N
Max. Thrust: 933.9 N
Total Impulse: 745.5 Ns
Burn Time: 1.2 s
ISP (est)*: 205 s
Motor Case: RMS-54/852

Certified by the Tripoli Rocketry Association (TRA), the National Association of Rocketry (NAR) and the Canadian Association of Rocketry (CAR).