I Class Rocket Motor

Gorilla I389GT

Gorilla Rocket Motors
Green Tornado
Ø 38mm
Total Impulse
553.1Ns
Burn Time
1.42s
Avg Thrust
389.0N
Max Thrust
454.9N

Thrust Profile (N)

1.42s Burn Window

Engineered by Gorilla Rocket Motors, the I389GT is a 38mm solid rocket motor designed for high-power rocketry (HPR). As an official I-class motor, it delivers a total impulse of 553.1 Ns over a 1.42 second burn window.

With an average thrust of 389.0 N and a peak of 454.9 N, it features a neutral thrust curve optimal for general sport flying. It utilizes the Green Tornado propellant formulation, dictating its specific impulse and exhaust signature.

Technical Specifications

Tripoli Rocketry Association, Inc.
Diameter 38 mm
Length 370 mm
Hardware 38/640
Delays (s) P
Specific Impulse 186.1 s
Peak Thrust 454.85 N
Peak Time T+ 0.683s
T/W Ratio 57.22
Propellant Green Tornado
Profile neutral
Type reload
Sparky No

Mass Budget

693g Total
Casing (Dry)
390.0g
56.3%
Propellant
303.0g
43.7%
Live Sizing
Flight Envelope

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Comparable I-Class Alternatives

I235WC

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I
No Curve Data
Total: 324 Ns
Ø 38mm

I200W

AeroTech

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regressive
Total: 325 Ns
Ø 29mm

I180W

AeroTech

I
dual-peak
Total: 326 Ns
Ø 38mm

I385F

Kosdon

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No Curve Data
Total: 326 Ns
Ø 29mm

I223GT

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I
neutral
Total: 328 Ns
Ø 38mm

I161W

AeroTech

I
dual-peak
Total: 329 Ns
Ø 38mm
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