[rcart]

Hey fellas, Art here. Wing warping is a very interesting subject. My project, 1/3 scale Fok EI, was inspired by Bob Holman plans for a 1/4 scale Fok EIII. This was a Dana Lockwood design, I think, from the late seventies maybe early 80's.....I forget exactly when. Any way, since Lockwood's design was very similar to Anthony Fokker's design, it looked like it would work ok, eventhough I had never before done anything like it. I figured anyone building an eindecker would build the EIII, so I changed mine to an EI. There are a lot of suttle differences between those two aircraft.
The wing moves about 1 & 3/4 inches each way, up and down. Maybe a little less. When I was building and first hooked up the warping mechanism, I had a lot more movement in the wing panels. In fact I heard wood and glue joints breaking...... I put on smaller servo arms and have not experimented with increased movement since. I have wanted to, but if it ain't broke - don't fix it!
The plane flies very well, but the contols are not balanced at all! By that I mean that the same movement of the control stick for each axis gives a differing amount of roll, pitch or yaw. The rudder and elevator are very responsive and the wing warp is extremely sluggish in comparison. Wing warp is effective, but SLOW ! To turn, I imput both rudder and wing warp to start the turn and then finish the turn with rudder and fly the wing warp in the opposite direction to bring the wings back to level. Like Lee already mentioned, the hard manuvering is done with the tail feathers. It is difficult to get it all working in harmony and also keep your flying smooth. This is my third full season flying it and I think I have got the hang of it now. It is fun and a great flyer, but limited in its flight capabilites - much like the original must have been.
This project was my first attempt at a competition scale model. It has abtained static scores of 88.5 all the way up to 95 at various contests. I am very satisfied with the project.
Fire away ...... I will attempt to answer any questions you guys might have.
I have not experienced any control reversal or adverse yaw. Nor have I had trouble with slow speed or high angle of attack inputs leading to a stall. Every plane has its own unique slow flight/stall envelope to learn. Nothing really different here for me. Maybe sometimes when I try to roll it and when it is upside down, these things happen.....it is hard to say as it is not predictable in this attitude. It will barrel roll and sort of snap roll, but it will not wing warp roll.