I Class Rocket Motor

Contrail I747-HP

Contrail Rockets
Unknown
Ø 38mm
Total Impulse
431.0Ns
Burn Time
0.59s
Avg Thrust
732.0N
Max Thrust
464.0N

Thrust Profile (N)

0.59s Burn Window

Engineered by Contrail Rockets, the I747-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 431.0 Ns over a 0.59 second burn window.

With an average thrust of 732.0 N and a peak of 464.0 N, it features a neutral thrust curve optimal for general sport flying.

Technical Specifications

Tripoli Rocketry Association, Inc.
Diameter 38 mm
Length 719 mm
Hardware Single Use
Delays (s) P
Specific Impulse 264.7 s
Peak Thrust 1917.34 N
Peak Time —
T/W Ratio 88.94
Propellant Standard
Profile neutral
Type hybrid
Sparky No

Mass Budget

839g Total
Casing (Dry)
673.0g
80.2%
Propellant
166.0g
19.8%
Live Sizing
Flight Envelope

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Comparable I-Class Alternatives

I235WC

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No Curve Data
Total: 324 Ns
Ø 38mm

I200W

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regressive
Total: 325 Ns
Ø 29mm

I180W

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dual-peak
Total: 326 Ns
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I385F

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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

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I
dual-peak
Total: 329 Ns
Ø 38mm
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