I Class Rocket Motor

Contrail I727-HP

Contrail Rockets
Unknown
Ø 38mm
Total Impulse
611.0Ns
Burn Time
0.84s
Avg Thrust
725.0N
Max Thrust
1662.0N

Thrust Profile (N)

0.84s Burn Window

Engineered by Contrail Rockets, the I727-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 611.0 Ns over a 0.84 second burn window.

With an average thrust of 725.0 N and a peak of 1662.0 N, it features a neutral thrust curve optimal for heavy rockets requiring high off-the-pad acceleration.

Technical Specifications

Tripoli Rocketry Association, Inc.
Diameter 38 mm
Length 922 mm
Hardware Single Use
Delays (s) P
Specific Impulse 375.2 s
Peak Thrust 1661.69 N
Peak Time T+ 0.036s
T/W Ratio 79.55
Propellant Standard
Profile neutral
Type hybrid
Sparky No

Mass Budget

929g Total
Casing (Dry)
763.0g
82.1%
Propellant
166.0g
17.9%
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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I180W

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I385F

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No Curve Data
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I223GT

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Ø 38mm

I161W

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dual-peak
Total: 329 Ns
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