Fusion SpaceMuster

Motor-hardware compatibility for high-power rocketry

660J381-15A

660 N·s · 381 N avg

Cesaroni Pro · class J · Skidmark · delay 6, 8, 10, 12, 15 s, adjustable · built for the Pro38-6G case

419 mm long · 688 g loaded · 396 g propellant

TRA certifiedSparky
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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 Pro38-6G case. Reusable hardware you buy once, plus the single-use reload.

Reusable hardware to own

Single-use reload to buy

660J381-15A reload cartridge

Single-use cartridge: preassembled grains, liner, nozzle, and forward closure — loads as one piece, and ejection charge

Source: thrustcurve.org

  • Sparky (metal-loaded) propellant: many ranges restrict these for fire risk. Check your field's rules before flying.
  • A little high-temperature grease on the closure threads and o-rings helps on assembly.

Cases that fly it

Its own case is the simplest; a longer case flies it too, with the adapter and spacers.