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

Design wings in your spreadsheet

AeroSheet loads airfoils directly into Google Sheets. Polars, 3D splines, Fusion 360 export, without leaving your spreadsheet.

Google Sheets Install in Google Sheets
Comparable I-Class Alternatives

I235WC

Gorilla

I
No Curve Data
Total: 324 Ns
Ø 38mm

I200W

AeroTech

I
regressive
Total: 325 Ns
Ø 29mm

I180W

AeroTech

I
dual-peak
Total: 326 Ns
Ø 38mm

I385F

Kosdon

I
No Curve Data
Total: 326 Ns
Ø 29mm

I223GT

Gorilla

I
neutral
Total: 328 Ns
Ø 38mm

I161W

AeroTech

I
dual-peak
Total: 329 Ns
Ø 38mm
Veenie Kit

Need a custom engineering simulator?

The 3D engine on this page is built by Veenie Aerospace. We build bespoke, browser-native digital twins, aerodynamic simulators, and AI physics tools for UAV startups and defense contractors.

ivan@veenie.space
Loading calendar...
ivan@veenie.space