A few months ago I aquired an older PT-19 .60 size. It's a single seater and in doing my research here, I cannot find a match. I do not know who made this but more importantly, I don't know where the center of gravity should be. Is there a general rule of thumb when it comes to the C.G ? I have no documentation, just the plane and radio. Can anyone point me in the right direction ?

Thank you, -DJJ