Hinging or wing drop

[Chuck Feldman]

I am in the process of getting a Veco Chief to fly as good as it can be.  The problem is hinging on inside corners. Outside it is fine. Now to tell you what I have. It is a stock Chief but the wing is foam. The model was built by Tom Dixon. It looks very nice and it flies very nice but for the above. It has a Double Star classic 40 equipped with a Randy Smith needle valve assembly and the engine runs a very Nice 4 2 4 run. The flap area has been reduced on the inside wing so that the flap area inside and out are the same. I am flying it on 60" line using a kaz handle. The wing tip weight two chips (1/2 ounce total) There is some engine offsett and a small amount of rudder offset. The controls are smooth and the alignment appears to be good. When I do loops I can see the wing top and the bottom also. So it does not stay flat as it should. The line tension is good even in the top.   OK there it is can anyone offer a method to go through to identify and correct the problems. This model is a pure joy to fly and I would like very much to get it into trim.  Thanks Chuck Feldman

[jim ivey]

you say you reduced the inside flap area? theres your problem right there. sounds loke the outboard wing is over flying the inboard wing. you see top of outboard on inside manuevers and bottom of outboard on outside manievers? Hi butchered a couger of mine like that. Flew the same way. He also had me put both ltadouts through thru same tube on the c/g!!  2 bad ideas on thr same airplane. Oh this was in 1955 , but the new chevys were cool that year    jim

[Brett Buck]

I am in the process of getting a Veco Chief to fly as good as it can be.  The problem is hinging on inside corners. Outside it is fine. Now to tell you what I have. It is a stock Chief but the wing is foam. The model was built by Tom Dixon. It looks very nice and it flies very nice but for the above. It has a Double Star classic 40 equipped with a Randy Smith needle valve assembly and the engine runs a very Nice 4 2 4 run. The flap area has been reduced on the inside wing so that the flap area inside and out are the same. I am flying it on 60" line using a kaz handle. The wing tip weight two chips (1/2 ounce total) There is some engine offsett and a small amount of rudder offset. The controls are smooth and the alignment appears to be good. When I do loops I can see the wing top and the bottom also. So it does not stay flat as it should. The line tension is good even in the top.   OK there it is can anyone offer a method to go through to identify and correct the problems. This model is a pure joy to fly and I would like very much to get it into trim. 

   I would guess there is a problem with the leadout position and/or the rudder offset. Any sort of yaw motion in the corners will cause it to roll also, particularly so with no taper in the wing. Are the leadouts widely separated, where are they relative to the CG, and how much rudder offset does it have?

    Making the flaps equal chord should be a step in the right direction, the differential flap areas create as many problems as they solve.

   Brett

[jim ivey]

well if you have more flap on outboard wing it would do that in the 50s when i flew models.  I seem to remember bob doing that to one of his T'birds.   trimming the back of the inside flap.he didnt like rhe results so he trimmed the outboard to match. I didnt use much leadout back angle, moved belcrank pivot to c/g as well. mine flew better. even bob thought so.  jim OOPS i just had a brain-fart! are you bending the flap wire to adjust a washout condition? rhat also can cause that. That last airplane I built had a warp and I used the flap to compensate, it did that.  After i removed the warp and zeroed rhe flaps again it went away. Hmmmm ijust remembered that . What happens when you use the flaps for trim purposes it distorts the laminar flow of that wing which doesn't  make any difference to you in level flight , but in manuevers it becomes exagerated. I dont know that this is your problem and the only knowledge I have was my experieces over the years. check youralignment I've never used a foam wing . but I bet they could be warped.    jim