B Class Rocket Motor

Quest B4-4

Quest Aerospace
black powder
Ø 18mm
Total Impulse
3.8Ns
Burn Time
0.91s
Avg Thrust
4.2N
Max Thrust
12.8N

Thrust Profile (N)

0.91s Burn Window

Engineered by Quest Aerospace, the B4-4 is a 18mm solid rocket motor designed for model rocketry. As an official B-class motor, it delivers a total impulse of 3.8 Ns over a 0.91 second burn window.

With an average thrust of 4.2 N and a peak of 12.8 N, it features a neutral thrust curve optimal for heavy rockets requiring high off-the-pad acceleration. It utilizes the black powder propellant formulation, dictating its specific impulse and exhaust signature.

Technical Specifications

National Association of Rocketry
Diameter 18 mm
Length 70 mm
Hardware Single Use
Delays (s) 4
Specific Impulse 37.6 s
Peak Thrust 12.81 N
Peak Time T+ 0.258s
T/W Ratio 25.91
Propellant black powder
Profile neutral
Type SU
Sparky No

Mass Budget

16.6g Total
Casing (Dry)
6.2g
37.3%
Propellant
10.4g
62.7%
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 coming soon
Comparable B-Class Alternatives

B6

Estes

B
neutral
Total: 4 Ns
Ø 18mm

B6

Quest

B
regressive
Total: 5 Ns
Ø 18mm

B2

Apogee

B
regressive
Total: 5 Ns
Ø 10.5mm

SCR-B6

SCR

B
regressive
Total: 5 Ns
Ø 18mm

B4

Quest

B
dual-peak
Total: 5 Ns
Ø 18mm

B6W

Quest

B
neutral
Total: 5 Ns
Ø 18mm
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