Fusion SpaceMuster

Motor-hardware compatibility for high-power rocketry

J525-LW

1113 N·s · 525 N avg

Loki Research · class J · Loki White · delay Plugged (no ejection charge) · built for the 54/1200 case

330 mm long · 1.24 kg loaded · 625 g propellant

TRA certifiedPlugged
Open in the interactive toolFind it in stockView on ThrustCurve

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 54/1200 case. Reusable hardware you buy once, plus the single-use reload.

Reusable hardware to own

Single-use reload to buy

J525-LW reload kit

Single-use: liner, propellant grains, o-rings, and the delay or smoke element (the nozzle and closures are reusable, not in the reload) (no ejection charge)

Source: thrustcurve.org

  • This reload is plugged — it carries no ejection charge and must be flown with electronic deployment (a timer or altimeter) and a plugged forward closure.
  • Loki's graphite nozzle is reusable and sold by throat number — the correct throat for this reload is in its instructions, and the wrong one can cause a failure.
  • 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.