Help. I am currently restoring a 1/4 scale model hot air airship which was built by Thunder Balloons in 1978.
It has been on loan to a Museum but on return to me all the motors and burner assembly were missing.
The propulsion motor was an HB 61 and I need to know the weight and the power output of this motor in order to replace it,if feasable by an electric equivalent.
Can anybody please help me?