J Class Rocket Motor

Contrail J642-BG

Name: Contrail Rockets J642-BG Rocket Motor
Creator: Veenie Aerospace
License: https://creativecommons.org/licenses/by/4.0/

Contrail Rockets

Unknown

Ø 54mm

Total Impulse

1092.6Ns

Burn Time

1.72s

Avg Thrust

633.7N

Max Thrust

1493.9N

Thrust Profile (N)

1.72s Burn Window

Engineered by Contrail Rockets, the J642-BG is a 54mm solid rocket motor designed for high-power rocketry (HPR). As an official J-class motor, it delivers a total impulse of 1092.6 Ns over a 1.72 second burn window.

With an average thrust of 633.7 N and a peak of 1493.9 N, it features a regressive thrust curve optimal for heavy rockets requiring high off-the-pad acceleration.

Technical Specifications

Tripoli Rocketry Association, Inc.

Diameter 54 mm

Length 922 mm

Hardware Single Use

Delays (s) P

Specific Impulse 247.5 s

Peak Thrust 1482.74 N

Peak Time T+ 0.007s

T/W Ratio 36.07

Propellant Standard

Profile regressive

Type hybrid

Sparky No

Mass Budget

1791g Total

Casing (Dry)

1341.0g

74.9%

Propellant

450.0g

25.1%

Live Sizing

Flight Envelope

Body Diameter 38 mm

Motor Mount 29 mm

Dry Mass 500 g

Target Apogee 1000 m

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

J245-BG

Contrail

regressive

Total: 644 Ns

Ø 54mm

440CC076J-J115

Hypertek

regressive

Total: 674 Ns

Ø 54mm

J355-BG

Contrail

dual-peak

Total: 679 Ns

Ø 54mm

683J250-15A

Cesaroni

dual-peak

Total: 683 Ns

Ø 54mm

699J145-19A

Cesaroni

regressive

Total: 699 Ns

Ø 54mm

J250W

AeroTech

dual-peak

Total: 704 Ns

Ø 54mm

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