I motori per razzimodellismo sono classificati con il valore dell'impulso totale designato con una lettera, da A (il più piccolo, ½A, ¼A, ⅛A) fino a O, il più grande. La classe A va da 1.26 Ns a 2.5 N·s, ogni classe successiva ha un valore doppio della precedente, per esempio classe B tra 2.51 a 5.00 N·s. Motori oltre la O sono al di fuori del campo amatoriale, e sono utilizzati da organizzazioni commerciali o governative.TRA website: .

Esempio, la lettera M rappresenta un impulso totale compreso tra 5,120.01 e 10,240.00 N·s.

Impulsi secondo la classe   Classe Impulsi totali(SI) Impulsi totali(Sistema imperiale britannico) Veicoli aerospazialio Razzi Regolamenti US A 1.26–2.5 N·s 0.28–0.56 lbf·s B 2.51–5.0 N·s 0.56–1.12 lbf·s C 5.01–10.0 N·s 1.13–2.25 lbf·s D 10.01–20.0 N·s 2.25–4.50 lbf·s E 20.01–40.0 N·s 4.50–8.99 lbf·s F 40.01–80.0 N·s 8.99–17.98 lbf·s G 80.01–160.0 N·s 17.99–35.97 lbf·s H 160.01–320 N·s 35.97–71.94 lbf·s I 320.01–640 N·s 71.94–143.88 lbf·s J 640.01–1,280 N·s 143.88–287.76 lbf·s K 1,280.01–2,560 N·s 287.76–575.51 lbf·s L 2,560.01–5,120 N·s 575.51–1,151.02 lbf·s M 5,120.01–10,240 N·s 1,151.02–2,302.04 lbf·s N 10,240.01–20,480 N·s 2,302.05–4,604.09 lbf·s O 20,480.01–40,960 N·s 4,604.09–9,208.17 lbf·s P 40,960.01–81,920 N·s 9,208.18–18,416.35 lbf·s Q 81,920.01–163,840 N·s 18,416.35–36,832.70 lbf·s R 163,840.01–327,680 N·s 36,832.70–73,665.39 lbf·s S 327,680.01–655,360 N·s 73,665.40–147,330.79 lbf·s T 655,360.01–1,310,720 N·s 147,330.79–294,661.58 lbf·s U 1,310,720.01–2,621,440 N·s 294,661.58–589,323.16 lbf·s Apollo launch escape rocket V 2,621,440.01–5,242,880 N·s 589,323.16–1,178,646.31 lbf·s W 5,242,880.01–10,485,760 N·s 1,178,646.31–2,357,292.62 lbf·s X 10,485,760.01–20,971,520 N·s 2,357,292.63–4,714,585.25 lbf·s Y 20,971,520.01–41,943,040 N·s 4,714,585.25–9,429,170.49 lbf·s Delta II Z 41,943,040.01–83,886,080 N·s 9,429,170.50–18,858,340.99 lbf·s 2Z 83,886,080.01–167,772,160 N·s 18,858,340.99–37,716,681.97 lbf·s 3Z 167,772,160.01–335,544,320 N·s 37,716,681.97–75,433,363.94 lbf·s 4Z 335,544,320.01–671,088,640 N·s 75,433,363.94–150,866,727.88 lbf·s 5Z 671,088,640.01–1,342,177,280 N·s 150,866,727.89–301,733,455.77 lbf·s Space Shuttle SRB 6Z 1,342,177,280.01–2,684,354,560 N·s 301,733,455.77–603,466,911.54 lbf·s

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