Letter Class	Pound Seconds Total Impulse
A	.283 - .562
B	.562 - 1.125
C	1.125 - 2.25
D	2.25 - 4.5
E	4.5 - 9
F	9 - 18
G	18 - 36
H	36 - 72
I	72 - 144
J	144 - 288
K	288 - 575
L	575 -1,151
M	1,151 - 2,301
N	2,301 - 4,602
O	4,602 - 9,204
P	9,204 - 18,409
Q	18,409 - 36,818
R	36,818 - 73,636
S	73,636 - 147,272
T	147,272 - 200,000*
*	FAA max Amateur