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More power to you!!
Genesis of LMR & HPR.

US Rockets Expendable Motors
daybreak
USR 40 E 10 liftoff at daybreak in a Space Shuttle model.

18mm compare
USR 20 D 5 or 20 D 16 compared with Estes 9 C 6 motors.
Estes 18mm motors are the most popular solid
rocket motors in the world by a large margin.


18mm SU USR 40 E 10 (E10-8) seen in the wild!

18mm Expendable Solid Rocket Motors
Motor Dimensions Thrust
Pounds
Time Power Propellant
Weight
Grain Cost
B4-2,4,8
0.69 x 1.75" 0.9 1.25 5 Ns 5 g E 5.95
C4-2,4,8
0.69 x 1.75" 0.9 2.5 10 Ns 6 g E 6.45
D5-0,4,8
0.69 x 2.75" 1.1 4.0 20 Ns 12 g D 6.95
D16-0-4,8,12
0.69 x 2.75" 3.6 1.25 20 Ns 12 g D 6.95
E10-0,4,8
0.69 x 4.75" 2.2 4.0 40 Ns 24 g D 10.95
F15-0,4,8
0.69 x 6.75" 3.3 4.0 60 Ns 30 g D 14.95
F20-0,4,8
0.69 x 8.75" 4.4 4.0 80 Ns 48 g D 19.95
G30-0,4,8,12
0.69 x 12.75" 6.6 4.0 120 Ns 72 g D 29.95
18mm Diameter = 0.69" = 11/16". Delay times are 2, 4, 8, 12 seconds, i.e.: B4-4 or G30-12.
"ILP Method" = 80F20-8; 80= total impulse Newton seconds, F= NAR letter class, 20= Average
thrust Newtons, 8= delay time from burnout to ejection in seconds, All motors include 12 volt
electrical igniter.

Compare USR and Estes motors (2001 prices)


2010: Estes C 3/$11.99 or $0.444-/N-s
USR E $0.273/N-s, USR F $0.249/N-s
or a 43.9% discount on power.
More power to you!!


24mm Motors 29mm Motors 38mm Motors


| 18mm SU | 24mm SU | 29mm SU |
| 38mm SU | 54mm SU | IGNITERS |


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