I Class Rocket Motor

Contrail I250-HP

Contrail Rockets
Unknown
Ø 38mm
Total Impulse
430.0Ns
Burn Time
1.70s
Avg Thrust
255.0N
Max Thrust
736.0N

Thrust Profile (N)

1.70s Burn Window

Engineered by Contrail Rockets, the I250-HP is a 38mm solid rocket motor designed for high-power rocketry (HPR). As an official I-class motor, it delivers a total impulse of 430.0 Ns over a 1.70 second burn window.

With an average thrust of 255.0 N and a peak of 736.0 N, it features a regressive thrust curve optimal for heavy rockets requiring high off-the-pad acceleration.

Technical Specifications

Tripoli Rocketry Association, Inc.
Diameter 38 mm
Length 719 mm
Hardware Single Use
Delays (s) P
Specific Impulse 398.5 s
Peak Thrust 622.75 N
Peak Time T+ 0.004s
T/W Ratio 35.9
Propellant Standard
Profile regressive
Type hybrid
Sparky No

Mass Budget

724g Total
Casing (Dry)
614.0g
84.8%
Propellant
110.0g
15.2%
Live Sizing
Flight Envelope

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Comparable I-Class Alternatives

I235WC

Gorilla

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No Curve Data
Total: 324 Ns
Ø 38mm

I200W

AeroTech

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regressive
Total: 325 Ns
Ø 29mm

I180W

AeroTech

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dual-peak
Total: 326 Ns
Ø 38mm

I385F

Kosdon

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No Curve Data
Total: 326 Ns
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I223GT

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neutral
Total: 328 Ns
Ø 38mm

I161W

AeroTech

I
dual-peak
Total: 329 Ns
Ø 38mm
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