I know this thread is kinda old. I just had about the same expierence. I just got a Thunder Tiger Sky Lark 40H last night. The invoice in the box said 7/11/1986. It is still in the box and the parts are still in the plastic bags and have never been opened. I have the manual, but it is crap. It is beyond basic. It simply states the obvious. I would be happy to copy the manual and e-mail it to you. It is only 3 pages but I will send it to you if you want it. I am sure it is a very similar plane.