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Old 01-27-2006 | 12:41 PM
  #420  
skypix
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From: Old Chatham, NY
Default RE: Air Hogs Aero Ace!

I entered the world of microbuilder and other stalwart DIY aerodynamicists and extended the top wings on my AA, as the pics should show. The Slow Stick Cub from GWS had an identical leading edge curve, so taping it onto the AA was a breeze.

The extra weight was about .1 oz., all up weight now is still under .7 oz according to my scale. I think the wing addition added about .115 oz. Pretty doggone negligible.

FLIGHT REPORT!:

Well, it was just abit breezy, but that was enough to require a couple c-clamp on a line retrieves from the local trees in my back yard. So more experimenting and adjusting is required in calmer air.

THE GOOD:
1. Climbs like a super sailplane...if I put it in a turn, it climbs in the turn.
2. floats floats floats...at the lowest throttle setting, flies straight and level or slight climb...wind made it hard to tell
3. Clearly has thermal potential, which means I better not take it anywhere I don't have the possibility of a long retrieve. This little baby would corkscrew out of sight in a heartbeat.
4. Flies even SLOWER than the AA...really floats around...or maybe it's my imagination, since it's a bigger-winged bird now, perhaps it's scale illusion. But sure seems to be noticeably slower.

THE BAD:

1. I think it's pretty badly out of CG now. I'd thought to have a little more trailing edge sticking back to move the center of pressure back and improve tail heaviness. (I only have a couple t-pins in the nose which helps the stock config mostly at minimum throttle...still porpoises on higher throttle settings, with neutral tailfeathers. SYMPTOMS: Even with down elevator, still climbs. In a bit of little gustiness, pitches up radically, enters into a PIO (pitch induced oscillation), which leads quickly to loops! I haven't dared get it very high to see how many I could do because it's so hard to control.

2. Rather resistant to turn input, I'm guessing because the engines need to be further out. Guess I'll solder some wire onto what's there now and move the engines outboard.
It also might need another dihedral to stabilize, i.e. more bend at the joint. It gets spirally instable pretty quickly. Which means I should probably extend the tailfeathers.

3. The extra wings are thicker than the AA's stock wings at the TE...I didn't mess with it too much, although I did heat it up with an iron and squish it down some, but it needs more attention.

THE UGLY: Throttle off it goes into a spiral dive for the ground...adding throttle to save the day sends it into a radical pitch up and loop, or half loop...hard to get control back. This is probably because I had down elevator to counteract the increased pitch under control...not sure, I need master builder MICROBUILDER to puzzle this one out, I'm a rank newbie at knowing what to do for sure.

But...it flies.

Possible remedies in addition to above:

1. I may move the additions slightly forward and see how that affects CG...
2. Should move battery forward as reported here before, that seems to be a good mod.
3. might make the tailfeathers bigger too
4. might just design a whole new airplane...but it's fun to have a soarable bipe, because it certainly is a featherweight thermal climber now...once I get it under control![&:]
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