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Information > Engine > The Numbers

All the technical numbers and figures you may want to look up.


Engine Power Table

All engines within amateur rocketry are classified by letter. The letter denotes the power band in which the motor falls. As you can see each power category is double the previous one, so don't be misled, the higher letters are much much more powerful.

Low Limit
(Ntsec)
High Limit
(Ntsec)
Low Limit
(lbsSec)
High Limit
(lbsSec)
Propellant Weight
(grams) (lbs)
A 1.26 2.5 0.28 0.56 1.3 0.0028
B 2.51 5.0 0.56 1.12 2.5 0.0056
C 5.01 10.0 1.13 2.25 5 0.0112
D 10.01 20.0 2.25 4.5 10 0.02
E 20.01 40.0 4.5 9 20 0.04
F 40.01 80.0 9 18 41 0.09
G 80.01 160.0 18 36 82 0.18
H 160.01 320.0 36 72 163 0.36
I 320.01 640.0 72 144 326 0.72
J 640.01 1,280.0 144 288 652 1.44
K 1280.01 2,560.0 288 575 1,305 2.88
L 2560.01 5,120.0 575 1,151 2,609 5.75
M 5120.01 10,240.0 1,151 2,301 5,219 11.5
N 10240.01 20,480.0 2,301 4,602 10,438 23.0
O 20480.01 40,960.0 4,602 9,204 20,875 46.0
P 40960.01 81,920.0 18,408 36,816 41,751 92.0
Q 81920.01 163,840.0 36,816 73,632 -- --
R 163,840.01 327,680.0 73,632 147,264 -- --
S 327,680.01 655,360.0 147,264 294,528 -- --

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