Ok guys, maybe you can help out, I am building a profile bipe that the top wing is farther forward of the bottom wing.
The problem I am having is when I link the upper and lower Ailerons together. Up they both move the same, but when the ailerons are deflected down the lower aileron barely moves.

I tried putting them both in line at a 90 degree angle but they bind that way.
I hope I don't need to put a servo on both, I have spent alot of hours and used alot of foam getting this thing to where I want it. Attached files

 

Do you have the servos driving a separate horn? The couplings between upper and lower ailerons should be separate from where the servo horn is and placed and should be on the trailing edges of the ailerons, at least that's how all my bipes are setup. Send some photos, maybe I am not understanding the effect of the stagger.

 

The Servo horn is separate, the problem I am having is linking upper and lower ailerons together.
On the bottom picture you can see the servo horn on top of the wing.

 

Jeff you are quick! I just saw the photos are now posted and see your problem right away, you can't use control horns, use a narrow tongue that has its center axis and hole right in line with the middle of the ailerons, the hole should be right on center too and behind the trailing edge of the aileron. Here are some photos of a few of my bipes showing what seems to work best, the first photo below is a S.E.5a bipe and has offset lower and upper wings just like yours, the second is a Divo bipe and has even upper and lower wings, the set up works well on both types, hope this helps out:

Attached files

 

Ok, I see what you are saying, my fuel Ultimate has them linked at the rear of the ailerons, but the wings are right on top of each other.

 

meistertek, I'm sure that your S.E. 5 bipe suffers form that problem as well, maybe not to the same extend, but it has it none the less. The problem is that when the lower aileron goes down it's TE goes further away form the TE of the upper aileron. Since the connecting rod is of a fixed length, something has to give and in this case the lower aileron deflects less down. This type of interlinking works correct only when the hinge line and the interlinking are exactly above each other. Any deviation will affect the ratio of deflection.

 

I think I am just going to move the bottom wing forward, i'm tired of goofing with it.
The only remedy I could see is to make a connector rod that goes down 90 degrees the across and back down to keep everything straight.
Easier just to move the bottom wing forward.

 

Yoram and Jeff,

I think the stagger wing will work and perform really well with a few mods, I really liked the performance of some of the stagger wing bipes I have had in the past.

I took a look at the S.E. 5 bipe with the ailerons actuated and it looks pretty even up and down top and bottom, see photos below. I also had a Great Planes Riot 3D which had the same aileron connections, was stagger winged, and it flew awesome with super axial rolls. http://www.electrifly.com/discontinued/gpma1570.html
The Great Planes Reactor Bipe is also set up the same way also with staggered winds and seems to fly very well with very axial rolls: http://vimeo.com/779197 All these planes have the servo horn at the leading edge of the lower aileron and the connecting rod holes for the upper and lower ailerons at or just behind the trailing edge of the ailerons. Attached files

 

Wow! Never thought it was this complicated. I have built quite a few bipes. Many of them had ailerons on only the upper and sometimes the lower wing. They flew fine, including nice rolls. It seems to me differences in deflection between the upper and lower aileron will not seriously affect the planes performance as long as the deflections are the same on both por and starboard sides. I have built a few of the foamie Ultimate Bipe which was cut on the Phlatprinter. I attach a connecting rod using micro control horns glued in at the trailing edge of the aileron and these planes fly awesome. Maybe I need to pay closer attention after reading these posts. Lots of good information here. Thanks for sharing thoughts and photos.

Chuck
...somewhere in Indiana...

 

Ok, I know this is way late, but I feel I must chime in here for future builds and builders. This is really just simple geometry. when you look at the side view all lines MUST form a proper parallelogram.

What this means is: the distance from hinge center to hinge point on edge of the ailerons MUST be the same length and the distance from top hinge to bottom hinge MUST be the same as the distance from aileron edge hinges.

Because Jnida63 used control horns facing each other, The distance between control horn hinge points is shorter then the distance between the hinges. Make sense? So a trapazoid is formed between the 4 points