I build the Dash Stick and at high speed it has a flutter and pull of to one side. When you slow down it stops it is a great flying plane i trimed the trailing edge back 5" from the end of the Ailerons no help.I changed the Incedence on the Wing this still didn,t help i was thinking that the air was hitting the wing at to great of a angle i think it fly better with zero of incedence it trim much easyer at zero . Can someone tell me how to find and stop this flutter.BUT IF IT WAS NOT FOR THE FLUTTER THIS WOULD BE ONE OF THE NICE,S PLANE I,VE EVER FLOWN.
Thank you
Vic.
WHJLT

my debonair did the same thing. someone told me to trim the aileron down by a couple flutes. i cut 2 flutes off right at the field. no more flutter.

You can CA a yardstick to the aileron. I never use Coro for the control surface. I ALWAYS use wood. Coro is too flexible for planes with more than a .30 size engine.

Captain,

Please don't make blanket statements like that. Especially when they aren't correct. Coro isn't too flexible for control surfaces larger than 30 size. If i were in the mood, i'd post a few pics of large planes with all coro surfaces with gas engines on the nose.

Flutter isn't always caused by the coroplast, alot of times its caused by slop in the control rod setup. Making sure there isn't any slop is usually the key, as well as using a servo with enough torque. A control horn that spans the whole chord of the surface does wonders as well. If all else fails, you can polyglue bamboo skewers through a few flutes to stiffen things up. Trimming the last 4 or 5" down at the tips helps as well.

At any rate, with spads ranging from .010 to 2.3 cu inches in displacement, they all have coro for control surfaces. The really big ones are a piece of 2 mil folded and glued over a piece of 4 mil, some have 2 pieces of 4 mil glued together, some have bamboo skewers stuck in the flutes, most have nothing at all. They all have full chord control horns, though, and most have servo torque at around 1 oz/inch of movable surface area, and all are slop free. They don't flutter.

Victor, if its turning one way or the other, its more than likely either an aileron, or the rudder. If its the rudder, you may need to add flying wires between the vert. and hor. stabs. If its the ailerons, you may need to go to dual servos, fix any slop, and trim the last 5" down, and use full chord horns, and or add some skewers in the flutes. I'd bet that you'll find slop in the control linkage setup, though, and possibly a stripped servo gear.

yep,what Chris said! I to use full chord control horns and have very little problem with flutter.If you have flutter check your control rods and servo arms for excessive wear or slop.I have had flutter before and changed a servo arm and it fixed the problem.I recently found thick bamboo skewers in the grill section at K-Mart.They are the Martha Stewart brand and are a snug fit in 4mm flutes.Listen to Chris,he has given me alot of advice and 99% of it worked!

I,ve all ready cut the edge on the ailron down no help i,ve already put rods in the cora opens no help the linkage is tight.It could be the servo i have not checked it yet i thought about going to two servo but at the time i didn,t have a y harness on hand.I wish when it was fluttering i would have thought to have took note of which way the plane was wanting to turn at lease that would have gave me a lead on which aliron was fluttering or what ever was going on.And i say thanks for the help from all of you i,m glad that the guy said that he used wood for the ailron becouse he could not get rid of the flutter problem if it,s the way he fixed the problem and it work for him thats sounds like the right thing for him to do.We all don,t fix the same problem the same way .
Thanks Vic.
WHJLT