I Class Rocket Motor

Contrail I155-HP

Contrail Rockets
Unknown
Ø 38mm
Total Impulse
541.0Ns
Burn Time
3.50s
Avg Thrust
155.0N
Max Thrust
355.0N

Thrust Profile (N)

3.50s Burn Window

Engineered by Contrail Rockets, the I155-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 541.0 Ns over a 3.50 second burn window.

With an average thrust of 155.0 N and a peak of 355.0 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 501.3 s
Peak Thrust 222.41 N
Peak Time T+ 0.011s
T/W Ratio 21.79
Propellant Standard
Profile regressive
Type hybrid
Sparky No

Mass Budget

725g Total
Casing (Dry)
615.0g
84.8%
Propellant
110.0g
15.2%
Live Sizing
Flight Envelope

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Comparable I-Class Alternatives

I235WC

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No Curve Data
Total: 324 Ns
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I200W

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I180W

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I385F

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No Curve Data
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I223GT

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neutral
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I161W

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dual-peak
Total: 329 Ns
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