RE: The RCFW Hellcat Group Build
I know the RCS SV 17 cc is 33 oz without ignition and battery i believe the total package depending on battery choice is approx. 41 oz
the proto type flew with a OS 61fx, plus 7-8 oz of nose weight.
acording to tower the OS 61 weights 23.6 oz with muffler
RCGF or aerovate makes a 15cc also this might also be a good choice though i have not looked into it yet