Gator Giles G202gt

[Mike Hester]

That's wierd indeed.

What kind of linkage are you using? There could be slop in the gear train, or between the output gear and the arm itself.

But most likely the culprit might be slop in the linkage itself. If airframe vibration was the problem, a lot more would be vibrating than one control surface.

If it were me.....I'd begin by checking for ANY play in the linkage, then replacing worn or ill fitting parts until it's rock solid.

If it vibrates while flying, then I'd also check the gap between the surface and the wing: seal them. I'd do that anyway, as it makes flying more consistent.

Also be sure the hinges are tight and not allowing the surface to flex too much at the hinge line. 

Also make sure the prop is balanced. APC props are hit and miss in this regard. I've gotten props from them where the hole is off center, and they were impossible to balance. Before I found this, I ran it 3 times and the plane developed several stress cracks. Ungood, so now I balance EVERY prop before installing it. (Which I should have been doing all along, stupid me). 

And lastly, some airframes (particularly the Gator planes) seem to be a flying tuning fork, and resonate badly at certain RPMs. Not much you can do here.

Good luck,
-Mike

  ----- Original Message ----- 
  From: Dave Smith 
  To: discussion at nsrca.org 
  Sent: Monday, May 31, 2004 9:31 AM
  Subject: Gator Giles G202gt


  Mike:   I agree with your comments,having built two of them. The first being a tad heavy at 12 pounds! That was 4 years ago.
  The current one is 10 pounds,six ounces which includes 2 oz.of tail weight. Some of which may be removed as I have only 26 flights on it.
  OS 140Rx,17x12 APC with Greve pipe,O.S.(Hatori?) header,and each wing is shortened 1" by clipping the tip. Flies very well,even snaps pretty good.
  There always seems to be a "but".....    The left aileron at about 3 or 4 clicks of throttle vibrates worse than anything I have seen in this regard,yet the right aileron is quite smooth. At other RPMs all seems good.  I have had to replace the out put gear in a new Futaba 9150,as the wheel would rock back and forth. Have not flown since.
  Mount is a Hyde,the one with aluminum beams and built in nose ring.

  Any suggestions as to how to eliminate the vibration in the left aileron,as I am not sure I can fly it as is.Will at least have to try to avoid that particular position on throttle stick.

  Thanks,,,,,,,,,,,,,,,,,,,,,,,Dave   #943
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