IMG20101009_001.jpg398d_3.jpgHi LEO0526,
I believe the BMP rounds are like the PG-9 rounds that have a flair in the motor body ahead of the tail fins/venturi section. The pg-18 is more like the M72 LAW rocket motor and has a straight tube before the fins/venturi. The later RPGs, 20, 22 etc have a similar motor, maybe larger diameter. PG-22 on left, PG-9 on right
Regards,
Bill



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