edge 540 with a bad snap
 

I have built a 23% edge 540 from powerline hobbies, i have hitec servos with a evo 26 gt gas engine, she is balanced great, aslo lateraly balanced as well. She flys great but i have a problem with turns, i bank the plane to the left and give it elevator and it snap roles to the right, and when i take a right hand turn and give it elevator it roles in more and dives a little bit, does anyone have any suggestions...The elevators are dead center all the way throw the flows...im dumb founded... Help please
thank you

RE: edge 540 with a bad snap
 

The snap roll to the right in a left turn sounds like the right wing is stalling. This can be due to washin on that side, or more down aileron movement on that side.
Dropping the nose to the right in right turns is relatively normal, if no elevator is used to pull the nose up.
Check the right wing for alignment with the left wing, from root to tip.
These need to be identical.

RE: edge 540 with a bad snap
 

I will check that today, i am not sure if its a stall because its at high speeds or at least from half throttle to full throttle, the alirons were in sink with each other, i will try to give the right a little down in it, thanks for the fast responce
jesse

RE: edge 540 with a bad snap
 

Sounds to me like you have too aft of a CG or too much up elevator or both. Recheck the manufacturers specs or call them and confirm the CG. I have had several planes do the same thing. The problem was always an incorrect CG..and taking out too much elevator throw to make the plane fly smooth and not snap, will make it harder to flare upon landing if you don't have enough elevator. Kevin

RE: edge 540 with a bad snap
 

Block the airplane up on a level floor and do some measuring. Check the incidences.

Also, in both turn directions, the right wing is the one stalling and "falling". And in turns, the AOA is increased and it's AOA that causes stalls. If your right wing is set with more incidence than the left, it'll naturally stall sooner. In a turn or in a straight line. You'll more often see it in the turn, because we do that twice every lap, right.

When you slow the model down as slow as it'll go until it stalls, which way does it stall? I bet it's to the right almost always.

A lateral balance check is also a good idea..... and you've done that. With a low wing, however, the cg can have a bit more effect in the air than we might see in our lateral balance check.

Have you measured the aileron deflection of each side? One moving more than the other will act as described. And if you've got a weak servo on one side, it'll do that. Or a servo with some teeth missing. If you don't have the same servos side-to-side, one side will be weaker.

Also, aileron gap will do that. Seal the gaps on both sides. Do that no matter what the measuring and checking show. It'll take no more than a half hour and you just might be amazed at the results. I use clear Ultracote and it's dead simple to do. I iron it into the gap and then just trim it. Don't need to iron it out onto the wing or aileron. And then run the iron along the seam and they smooth out perfectly. Ultracote in the gap is quiet an strong. No wrinkling sounds or anything. It's like it wasn't there.... until you fly.

RE: edge 540 with a bad snap
 

23% model with a 26 gasser .
As a guess - you are really maxed out on usable wing loading
so get it as straight as you can - keep the CG at 25%-do not exceed 30%-
keep speed up and balance throws to your needs only-
My own experience in this problem is that the model can be letter perfect in all alignments and cg - and you can use ANY airfoil you desire plus any amount of wash out/ wash in you may assume will help--
the real problem?
at this scale, wing loading is a critical factor .
You will need to readjust the flight envelope to accommodate the loading .
keep all pitching maneuvers smooth and well radiused .
In short --there is no fix for high wing loadings --other than keeping speed up and angle of attack down.

RE: edge 540 with a bad snap
 

I have a NIB Power-line Hobbies 23% Edge 540 but I do not have a manual with it. If you have one could I get a copy of it?

Thanks
Tom