K Class Rocket Motor

Loki K690-SF

Loki Research
Spitfire
Ø 54mm
Total Impulse
1616.0Ns
Burn Time
2.35s
Avg Thrust
687.0N
Max Thrust
910.0N

Thrust Profile (N)

2.35s Burn Window

Engineered by Loki Research, the K690-SF is a 54mm solid rocket motor designed for high-power rocketry (HPR). As an official K-class motor, it delivers a total impulse of 1616.0 Ns over a 2.35 second burn window.

With an average thrust of 687.0 N and a peak of 910.0 N, it features a neutral thrust curve optimal for general sport flying. It utilizes the Spitfire propellant formulation, dictating its specific impulse and exhaust signature.

Technical Specifications

Tripoli Rocketry Association, Inc.
Diameter 54 mm
Length 498 mm
Hardware 54/2000
Delays (s) P
Specific Impulse 117.7 s
Peak Thrust 807.39 N
Peak Time T+ 1s
T/W Ratio 29.18
Propellant Spitfire
Profile neutral
Type reload
Sparky Yes

Mass Budget

2400g Total
Casing (Dry)
1000.0g
41.7%
Propellant
1400.0g
58.3%
Live Sizing
Flight Envelope

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Comparable K-Class Alternatives

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