It all has to do with the CG (center of gravity) If you place your fingers under the wing, about 2 inches back from the leading edge, you will find the plane will balance on your finger tips. As you add weight to the tail you will find you have to place your fingers further from the leading edge to make the plane balance on your fingertips. A trainer is nose heavy. And for good reason. A plane flies more stable that way. Like an arrow, or a dart. If you look at an arrow or a dart you will see the front is heavy and that’s why it files in a nice stable manor. If you take the weight off the nose the dart becomes unstable and flops around.

An airplane is the same way. With the nose heavy, it is nice and stable. Forgiving if you will. It takes a bit of up trim to keep the nose up. The faster the plane flies the more authority the elevator has. That is why if you trim the plane to fly level at 40% power, you will find yourself climbing if you add full power or go into a dive. The plane goes faster, the elevator becomes more responsive and the nose goes UP.

If you want to stop that from happening, all you need to do is add some weight to the tail. You can do this by moving the battery pack, or by simply adding weight. You can get weight from the hobby shop just for this. Don’t add too much!! Remember the dart with no weight on the nose? Your LT-40 will do the same thing if you add too much weight to the tail, and you will have a bag of sticks. My advice is to have someone with more stick time help you get your plane balanced the way you like it. Don’t try this on your own unless you have a full understanding of the laws of lift and the laws of weight and balance.