Take a look at the LT 40 photo. Notice the relationship of the bottom of the wing to the horizontal stabilizer. Imagine what the airplane would do if you were to either raise the leading edge of the horizontal stabilizer, or raise the trailing edge of the wing. All airplanes have what is called incidence, and that term is used to describe the wing or other horizontal flying surface relative to the datum line of the airplane. That datum line is normally an imaginary line drawn from the front to the rear of the fuselage, and is based on the centerline of the engine crankshaft, and or the fuselage crutch. If the leading edge of the wing is higher than the trailing edge, then the wing in flight will still try to remain flat (level) and you can see what the airplane will try to do relative to the wing. Now look at the horizontal stab, and you can see the effect of the wing being level. On the LT 40 in the photo, the leading edge of the stab will be low (incidental to the wing bottom), and the airplane will try to climb (which will make the tail appear to be draggy). The more throttle you give the plane, the more this ballooning is evident. You might try adding a shim to the trailing edge of the wing to raise it slightly (don't get carried away here), or remove a little of the down thrust in the engine (again don't get carried away). Sometimes this is a design flaw of the model, and you just have to add down trim, and live with it. It's good that you newer guys are noticing these things, and are asking questions about it, rather than just trimming it out and figuring that it's something that they all do. They do not.

Bill, AMA 4720
WACO Brotherhood #1