Total Impulse
172.0Ns
Burn Time
0.60s
Avg Thrust
283.0N
Max Thrust
752.0N
Thrust Profile (N)
0.60s Burn WindowEngineered by Contrail Rockets, the H303-PVC is a 38mm solid rocket motor designed for high-power rocketry (HPR). As an official H-class motor, it delivers a total impulse of 172.0 Ns over a 0.60 second burn window.
With an average thrust of 283.0 N and a peak of 752.0 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 508 mm
Hardware 48 20 F PVC (185CC)
Delays (s) P
Specific Impulse 140.3 s
Peak Thrust 780.15 N
Peak Time T+ 0.045s
T/W Ratio 48.98
Propellant Standard
Profile neutral
Type hybrid
Sparky No
Mass Budget
589g TotalCasing (Dry)
464.0g
78.8%
Propellant
125.0g
21.2%
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.
Install in Google Sheets coming soon Comparable H-Class Alternatives
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.