Total Impulse
648.5Ns
Burn Time
3.47s
Avg Thrust
270.0N
Max Thrust
427.6N
Thrust Profile (N)
3.47s Burn WindowEngineered by Ellis Mountain, the J270 is a 38mm solid rocket motor designed for high-power rocketry (HPR). As an official J-class motor, it delivers a total impulse of 648.5 Ns over a 3.47 second burn window.
With an average thrust of 270.0 N and a peak of 427.6 N, it features a regressive thrust curve optimal for general sport flying.
Technical Specifications
Tripoli Rocketry Association, Inc.Diameter 38 mm
Length 384 mm
Hardware 38X438.1 38X467(D)
Delays (s) 20,P
Specific Impulse 190.5 s
Peak Thrust 386.52 N
Peak Time T+ 0.175s
T/W Ratio 38.66
Propellant Standard
Profile regressive
Type reload
Sparky No
Mass Budget
712g TotalCasing (Dry)
364.9g
51.2%
Propellant
347.1g
48.8%
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 J-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.