Information > Motors > Motor Impulse Classes
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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Educational Discount Program |
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