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Manufacturer | Notes |
|---|---|
| Aerotech | Manufacturer of motors ranging in impulse form D through N (18-98mm). Parent company is RCS. Cases are threaded. |
| CTI | Manufacturer of E through O motors (24-161mm). Cases are threaded |
| Loki Research | Has a 38mm 'K' and a 54mm 'M'. Their cases are also very good for EX work due to their use of snap ring closure retention. |
| Estes | Produces mainly low power black powder rocket motors. |
| Hypertek | Produces several sizes of hybrid rocket motors |