Jao.
Welcome to RC Groups. I am not an expert but I can suggest that you may have developed a bad warp in the wing. Look very close at the wing from straight on and from the side. if you use wood for spars on foam it is likely it warped. Temperature, sun, and moisture can attack foam also. Use of carbon fiber will generally hold a wing straighter for a longer period. I use Carbon fiber arrow shaft in all my planes. They are straight and very stiff.. This is only a starting point to look for your problems.

Next is the motor should have a degree down thrust and right thrust.

Next . Check the elevator to make sure it is truly straight. Measure from the wing tip to the elevator and the measure should be close for each tip measure. Make sure the incedance is straight on the same centerline as the wing and a line drawn from the motor centerline to the elevator line on the tail end.

Check lateral balance again to make sure one side of the wing is not heavier than the opposite side.

Maybe someone else may have more ides to check also.

Good Luck,
**Neons** Bob

You might have a slight warp in the wings. A large ruler across the wingtip at each end and then look down the wing to see if the rulers are parallel may help you check it. What you have described is not a common or known fault. Another remote possibility is that the servo may not be centreing correctly.

Originally Posted by joaopaul0

my Das Ugly Stik is tending to roll right.

I don't know why this is happening, because wing is balanced, ailerons are center trimmed, rudder is perfectly centered.

I need almost full left aileron trimming to stop rolling, it is very visible the diference after trimmed ailerons they are no longer centered.

Im lost, no ideia what to do now.

might be the positioning of the electronics inside the fuse. Hold it by the tip of the prop nut and a center point on the tail and see if it is balanced on it's centerline. re-install electronics to get it to balance.

BTW, mine needed a little right trim to fly right, but not full trim

thanks for the help.
the problem was cambered foam at elevator .
Now with little trimming it flies nice.
tired of belly landings, I gave it floats.



Floats maiden flight

Hidro Das Ulgy Stik (9 min 1 sec)

Motor Turnigy Aerodrive XP D2830
Propeller APC-E 9x6
Batery Turnigy 1600mah 20-30 C
ESC Birdie 30A
Wing 1 meter NACA 2412 , hot wire cut foam
AUW 560g (19.8oz)

This is my second build in RC models.

Thanks for the wonderful plans. I hope to get started on m build in a week or so. Newbie at building, but with the cheap price of foam, thought I would give it a shot.

on a side note, to the gentleman with the zip questions, if you don't want to download a program, just use windows internet explorer. if you have the latest version it should unzip it for you, that's what I use. hope that helps you some.

again thanks for taking the time to post the plans, and tutorial on the build.

Hi,
I've been helping a buddy build one for a trainer. He has done some flying on his own and this plane should help him along with building flying skills quite well. I'll take some pics next build sesion