ORIGINAL: rtn9105
raideron
After reading your post I went back and checked my CG again and I found that I was wrong the first time, my CG is at 5.5 back with the S-100. I don't think my problem has anything to do with to much air from the prop not letting it get flat because I've tried it with all different throttle settings from 0-full throttle and the only result being it spins faster with more throttle. I've also tried the ailerons from 0 aileron input to full input the same direction as the spin as well as 0 to full input the opposite direction as the spin. I've also tried all of this both inverted and up write. It won't even flatten out at the end of a blender, it just slows down but the elevator won't push it flat.
Maybe this particular plane just won't do a flat spin[
] It's just frustrating because my last one would do them so nice and I've heard you guys all talking about how well the Do does them.
That is so weird. A UCD that won't flat spin. Mine does them so nice and both sizes will do rising flat spins. Not many planes will do that.
You must have something wrong. I think maybe it could be too much throw. Try it on lower rates. I have all three surfaces on dual rates. I never use the ailerons on high rates when doing flat spins. I usually have the rudder and elevators on high but the ailerons on low. That might help.
The other thing I thought about was your rudder servo. That one needs to be high torque. Is it?
Another thing that helps me is patience. When you have the rudder in the right corner and the aileron in the left corner and the elvators full down, just hold, hold, hold, and then start sliding the aileron stick slowly to the right. Mine ends up about center. I usually start the flat spin at an idle and then transition to the aileron about center and then pick up the throttle and jockey the rudder and ailerons to keep in flat and start the infamous, envious, rising flat spin.
Just a couple of thoughts. I hope one of them will help you. All 8 of my collectively owned UCDs have done a beautiful flat spin. The verdict is still out on the Giant as I haven't really tried one with it yet.
Good luck.
thanks
Barry