Aircraft usually have a CG range, not just one particular spot. Cubs, scale or not, have a wide CG range. Sailplanes usually do not. Our wide CG range makes it easy to modify and fly the plane. I wouldn't doubt if this model has a range of an inch or slightly more! In model aviation, that's huge. My giant slope delta Messerschmitt P.1111 has a CG range of about 3/8".
If your aircraft is more rear-CG heavy, ie. you make a nifty airplane balancer thingy as seen in previous posts and your ship balances about 2" back, your Cub will be quite lively and maneuverable, ie unstable. If you move the CG forward by adding nose weight or removing weight near the tail, ie tailwheel or battery mods, you'll find her to be nice and sedate.
100% scale example: when we test fly our production aircraft, we do cross-control (full OPPOSITE rudder and aileron) stalls at most forward CG and most aft CG, power on and power off, with flaps at all three settings! Full aft CG, 40 degrees of flaps, power on stalls are the most violent. An aircraft is considered "out of tolerance" if (follow closely) pitch, yaw OR roll changes by... 90 degrees.
I flew back seat during one of these test flights because they needed the aft weight and we ran out of 25 lb shot bags. The plane stalled, immediately dropped the nose 40 degrees, rolled onto it's right side 85 degrees, and yawed 77 degrees.
Barf bags: don't leave home without them!
Win if you can, lose if you must, but always cheat.
Post by sackohammers on Dec 24, 2007 4:01:06 GMT 1
Unfortunately I haven't been able to fly it yet... so frustrating. Everytime I go to fly there is too much wind. I fly the cub instead... I don't mind the wind with that thing - its fun. But I'm trying to wait for a good day for the TM maiden. I think I've taken it to go flying about 8 times now and still haven't gotten it up yet. Hehe, I hope my patience pays off.
Have you maidened it yet?