Total Impulse
1569.9Ns
Burn Time
4.89s
Avg Thrust
320.5N
Max Thrust
738.0N
Thrust Profile (N)
4.89s Burn WindowEngineered by Contrail Rockets, the K321-BG is a 54mm solid rocket motor designed for high-power rocketry (HPR). As an official K-class motor, it delivers a total impulse of 1569.9 Ns over a 4.89 second burn window.
With an average thrust of 320.5 N and a peak of 738.0 N, it features a neutral thrust curve optimal for heavy rockets requiring high off-the-pad acceleration.
Technical Specifications
Tripoli Rocketry Association, Inc.Diameter 54 mm
Length 1220 mm
Hardware 54 48 M BG (1490CC)
Delays (s) P
Specific Impulse 355.6 s
Peak Thrust 732.25 N
Peak Time T+ 0.99s
T/W Ratio 15.99
Propellant Standard
Profile neutral
Type hybrid
Sparky No
Mass Budget
2043.0000000000002g TotalCasing (Dry)
1593.0g
78.0%
Propellant
450.0g
22.0%
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.
Comparable K-Class Alternatives
1176K1720-P
AMW
K
dual-peak
Total: 1176 Ns
Ø 54mm
1281K360-13A
Cesaroni
K
neutral
Total: 1281 Ns
Ø 54mm
K456DM
AeroTech
K
regressive
Total: 1281 Ns
Ø 54mm
835CC125J-K240
Hypertek
K
regressive
Total: 1292 Ns
Ø 54mm
SK-54-1750
AMW
K
neutral
Total: 1300 Ns
Ø 54mm
K400C
AeroTech
K
regressive
Total: 1304 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.