J615ST-20A
746 N·s · 615 N avgAeroTech RMS · class J · Super Thunder · delay 4, 8, 12, 16, 20 s, adjustable · built for the RMS-54/852 case
240 mm long · 802 g loaded · 371 g propellant
Muster is a shopping aid, not an assembly guide. Build only to the reload's printed instructions — always the authority — and confirm every part with the manufacturer before you buy or fly.
What you need to fly it
The simplest build — in its own RMS-54/852 case. Reusable hardware you buy once, plus the single-use reload.
Reusable hardware to own
- RMS-54/852 case5485C
54 mm reusable motor case
Source: aerotech-rocketry.com
- 54 mm forward closure54FCC
Reusable; shared across every case length in this diameter
Source: aerotech-rocketry.com
- 54 mm aft closure54ACC
Reusable; holds the reload's single-use nozzle
Source: aerotech-rocketry.com
Single-use reload to buy
Single-use: grains, liner, nozzle, o-rings, delay element, igniter, and ejection charge
Source: thrustcurve.org
- A dab of high-temperature o-ring grease is needed on assembly (it comes with most hardware sets).
Cases that fly it
Its own case is the simplest; a longer case flies it too, with the adapter and spacers.