I just got my Modeltech Luckystick up and flying, but when I go to do a loop it does a corkscrew instead, but everything else checks out, it tracks straight with hands off in flying, banks great, and will spiral with no problem, its just my loops that are acting funny, what could it be and what should I do to correct it?

too much throw in elevetor maybe?

might be applying ailerons by accident,or could have aileron rudder trim fighting each other, will fly hands off level then corkscrew in loops,wing tip may be heavy. go to:www.nsrca.org,click on technical,click on airplane trimming, hope this helps

could the rudder be out of trim? One of the ways I learned to trim the rudder was by doing loops and correcting with rudder trim until loop looks right

Zee

Check that both sides of the elevator go up the same amount when you pull back on the stick. If they are on seperate pushrods, one could be going up more than the other. Also sight forward from the back end and make sure that the tail is not scewed from the wing. Look forward and make sure that the tail is straight with the wing in reguards to twist is maybe another way to say it.

You also may want to try a BIGGER loop. A bigger loop will eliminate any "snapping" tendancy and also allow you to adjust as it loops.

Just be careful on the bottom of the loop. Try it high, so you aren't going to have to tighten it up on the bottom. If your plane has a snapping tendancy, you don't want to find that out 30 feet off the ground.

Mike

have you balanced the plane also? one wing being heavier could cause that...

You either have too much elevator throw or your throw is not balanced. Make sure that each side of the elevator moves the same.

A buddy of mine who is an experienced pilot with over 20 years of experience had this happen with a Golberg Extra 300S. It had been balanced both longitudinally as well as laterally and the throws checked and rechecked.

He was flying along at full throttle and had been doing loops and rolls decided to do a tight loop. The plane pulled up and then it snapped and went real crazy on him. Fortuantely all those years of experience and the fact that he was about 3 or 4 mistake levels high (because it was a new plane) and he was able to save it.

We determined that it was a type of high speed stall, the name of which escapes me right now. Basically the plane is flying straight and level and you pull up so fast the you loose the laminar air flow over the wings and then gravity takes over until you can get it straightened out (if you have enough altitude to straighten it out).

Andy

Definetly sounds like an out of trim rudder to me. As was suggested before try bigger loops to be sure it's not stall induced. A lot of people trim their new planes with ailerons only. If your ailerons are set with a lot of travel, be sure your not inducing corkscrew with their movement. In the following, do all loops into the wind. Get your plane up on a fairly calm day, after each loop adjust the rudder in the opposite way it corkscrews, then re-adjust aileron for straight and level flight. When it loops straight, it is properly trimmed.

I'll bet that it always corkscrews to the left doesn't it? I'm betting that it needs a little right thrust. That is, assuming that all flying surfaces are relatively straight and that it flies ok on a straight and level course.
You can verify it if you pull straight up at full power and release all controls. If it pulls to one side consistently, that's generally a thrust issue. If it pulls left, more right thrust. If it pulls right, a little less right thrust.
Just one more possibility to check out.

I had the same problem with my Super Sportster. All the replys are right on, but in my case, I just had way too much elevator throw. (approx. twice that of the suggested in the book that came with the ARF). Guess I started getting anxious towards the end of assembly. OOPS !!! Dennis Flora