Ailerons as big as possible?

[mikejbb]

I'm about to start cutting, probably tomorrow or wed at the latest. I've read all the aileron posts and my ? is should I make the ailerons as wide as possible. I've decided and marked the wing so I'll have 1.75" ailerons. But how wide, 12", 14", 16"? Is there a down side to a larger aileron? I've read here that if they are too small, they don't do enough. But can you go too large and make the sc not controllable? Or maybe make the wing to weak? I've taped on 2 very thin cf rods on the bottom already since I snapped the wing a while ago.

Thanks
Mike

[av8tor]

The only possible problem I can think of with ailerons that are too long is too much adverse yaw occurring when you try and turn. Adverse yaw is the tendency for the nose to go in the opposite direction of the turn as a result of the increased drag from the down aileron. I would use what other people have had success with - hard to argue with success *S*

[mikejbb]

Thanks, good point re *S*.

Mike

[flyinghigh]

You could add in differential on the ailerons. That limits the adverse yaw.

Depends if you got a computer radio or not.

[mikejbb]

No computer radio, just an old 4ch futaba. Thanks for the idea.

Mike

[cvrcmember]

Probably just go with what everyone else is doing and be on the safe side.

[mikejbb]

Reporting back, they work great and will never fly without ailerons again if at all possible. I fly slow a lot so bigger would be better I think.

Next time I'll make them as big as possible, if there is a next time. This wing is already snapped in half and glued and cf stripped so I guess if I loose my sc (like I almost did 2 times already) then I'll make them 2" and full length.

They are currently 1.75" x 12". I'll also add to the rudder some day. Hopefully the 9gm servo's will be ok with that.

Mike

[flyer88]

There is a proper measure for ailerons that should be followed.

For a full length strip aileron ( which is only 80% of the trailing edge) it's recommended you go 10% of your wing cord (wing thickness) for the aileron thickness. These actually produce less adverse yaw than other ailerons due to there location close to the CG. ( 15" x .75" )

Ailerons on the outboard edge of the wing are only 40% of the trailing edge long and 25% of the wing cord thick. These have a tendency of producing a little more adverse yaw due to their outboard location, which pulls the plane when they are used producing adverse yaw. You might have to compensate for this in your radio setup. ( 7.75" x 1.75" )

[mrmugen]

supercubclub.proboards78.com/index.cgi?board=aelrns&action=display&thread=1096&page=1

Check out my 2nd wing. It works flawlessly. I have been flying it ever since I built it and never had a single issue with adverse yaw. This may be partially due to the other mods on this plane that add weight in the front.
Kevin

[flyer88]

mrmugen:

If you look closely at your control horn with relation to your hinge point, you will notice that they are not lined up on the same plain. You have created a differential offset (mechanically) without knowing it.

[mrmugen]

RIght indeed. I fixed that on my 2nd wing. Learning comes at a cost usually.... No biggie though. I see I didn't put up a pic of the 2nd one in depth at all. Will see if I have one or just take another one.

Kevin