E Class Rocket Motor

Roadrunner E25

Roadrunner Rocketry
Rapid propellant
Ø 29mm
Total Impulse
39.0Ns
Burn Time
1.50s
Avg Thrust
25.0N
Max Thrust
40.0N

Thrust Profile (N)

1.50s Burn Window

Engineered by Roadrunner Rocketry, the E25 is a 29mm solid rocket motor designed for model rocketry. As an official E-class motor, it delivers a total impulse of 39.0 Ns over a 1.50 second burn window.

With an average thrust of 25.0 N and a peak of 40.0 N, it features a dual-peak thrust curve optimal for general sport flying. It utilizes the Rapid propellant propellant formulation, dictating its specific impulse and exhaust signature.

Technical Specifications

Tripoli Rocketry Association, Inc.
Diameter 29 mm
Length 76 mm
Hardware SU 29x76
Delays (s) 4,7,P
Specific Impulse 193 s
Peak Thrust 38.66 N
Peak Time T+ 0.315s
T/W Ratio 32.67
Propellant Rapid propellant
Profile dual-peak
Type SU
Sparky No

Mass Budget

78g Total
Casing (Dry)
57.4g
73.6%
Propellant
20.6g
26.4%
Live Sizing
Flight Envelope

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Comparable E-Class Alternatives

24E22-13A

Cesaroni

E
dual-peak
Total: 24 Ns
Ø 24mm

25E75-17A

Cesaroni

E
dual-peak
Total: 25 Ns
Ø 24mm

26E31-15A

Cesaroni

E
regressive
Total: 26 Ns
Ø 24mm

E12

Estes

E
regressive
Total: 27 Ns
Ø 24mm

E26W

AeroTech

E
dual-peak
Total: 28 Ns
Ø 24mm

E9

Estes

E
regressive
Total: 28 Ns
Ø 24mm
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