Birman: I purchase a PT-40 built by another modeler after it had only a couple of flights on it.
As I understand, the plane came to the club field tail heavy, and needed 6 oz. of lead in the
engine compartment. Then there was some aileron problems during the flights. The dad and
son decided to go into sail boats instead, and that is when I purchased the model. It took me
a while to correct some of the construction problems, but only needed 3 ozs once the work was
finished. With the new Magnum .40 already through the break-in cycle, the plane flew beautifully. I soloed on this plane in 1996, and flew it for about a year before it stalled far from
the club field, and flew away with a new GMS .47 just installed. It was never found. Moved on
to an Eagle 63 purchased from another club member, and still fly it today.

In my construction changes, I moved the servo tray up against the former next to the front
wing hold down dowel, and installed the flat rx battery up against the back of the firewall. By
making these changes, I reduced the balance weight by 3 ozs. As others have posted on this
thread, you might not have a tail heavy problem with your plane. Just thought what I found
with my PT-40 would help you in your construction.

Get back to me if I can help in any way.

Rich S.