64 mm

908 mm

11,660 g

1,672 g

463.0 N

261.8 N

853.0 N

1,861.0 Ns

3.9 s

Tribrid: ABS/Alcohol/Nitrous


K463 (45% K)



Compared with all 168 K motors:

Total Impulse

Average Thrust

Maximum Thrust

Burn Time

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Simulator Files

Format Source Updated Contributor
RASP mfr November 7, 2021 Mike Caplinger

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Motor Notes

Cert notes John Coker May 25, 2010

These motors are called Tribrids, specifically for their ability to use both a nitrous oxide oxidizer, solid ABS grains, and now certified for the first time, liquid alcohol as fuels.

The K350TR-P is a 45% K motor, 1861 total NS, 853 NS max (at the start of the Tri-propellant mode), a 463 N average and a 3.89 second burn time. The thrust profile is a typical hybrid profile, albeit with an atypical difference in the initial rise to about 120 pounds for about .1 seconds, then a transition to the Tribrid phase (alcohol introduction) for a second rise to 175 pounds. From there it is straight line regressive to the 3 second point and 100 pounds, where it enters vapor phase, dropping to 40 pounds. It then does a typical hybrid tail-off to zero at the 4.6 second point. The motor total weight (pre-nitrous) is 5.3 pounds with 290 ml alcohol (.645 lbs.), .115 lbs ABS grain weight, and 1170 cc of nitrous oxide capacity. Post weight is 4.54 lbs.

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