J3 Cub CG recommendation
11-13-2008 | 09:49 PM
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From: Richmond,
MO
J3 Cub CG recommendation
Hey everyone!
Got a new bird ready to fly other than the CG instructions call for a cg of 100 to 120 MM from leading edge. plane is a 81" j3 piper cub. os 91 surpass power, was wondering where someone other than me would start with the CG and where to balance IF it determined to CG at 100MM then should the plane hang level or nose down slightly? Have never had a high wing before there a new breed to me.
thanks a lot
Oh BTW it is a will hobby 90 size j3 cub. after a few mods it turned out to be OK other than the cheap-ass covering they used. melts at 200*f. [&:]talkin about LOW temp covering.
once again
thanks
Big-Mo
Got a new bird ready to fly other than the CG instructions call for a cg of 100 to 120 MM from leading edge. plane is a 81" j3 piper cub. os 91 surpass power, was wondering where someone other than me would start with the CG and where to balance IF it determined to CG at 100MM then should the plane hang level or nose down slightly? Have never had a high wing before there a new breed to me.
thanks a lot
Oh BTW it is a will hobby 90 size j3 cub. after a few mods it turned out to be OK other than the cheap-ass covering they used. melts at 200*f. [&:]talkin about LOW temp covering.
once again
thanks
Big-Mo
11-13-2008 | 10:18 PM
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From: Warialda NSW, AUSTRALIA
RE: J3 Cub CG recommendation
G'day Mo,
I would start at 110mm from leading edge, it should hange so the the tailplane is level, or as you would call it, the horizontal stabilizer.
Make sure you use the recommended elevator throws, on low rate, & set high rate to 30% more, in case you need the extra control, I do the same for the ailerons, the rudder throw should be low enough throw to allow taxiing, but not too much to cause ground looping, Cubs are notorious for that, always & I mean ALWAYS, hold full UP elevator, until the plane is moving then release, & add power slowly & SMOOTHLY, when taking off, & steer with rudder.
I would start at 110mm from leading edge, it should hange so the the tailplane is level, or as you would call it, the horizontal stabilizer.
Make sure you use the recommended elevator throws, on low rate, & set high rate to 30% more, in case you need the extra control, I do the same for the ailerons, the rudder throw should be low enough throw to allow taxiing, but not too much to cause ground looping, Cubs are notorious for that, always & I mean ALWAYS, hold full UP elevator, until the plane is moving then release, & add power slowly & SMOOTHLY, when taking off, & steer with rudder.
