Hand Tapper or Hand Hammer

[mklotz]

Never seen anything like it. Must be the most unique engine in the world.
Looks like the alignment would be critical.
Very nice. Cheers, JR

It's an exercise in frustration to make and get running. The pistons, which are turned and then forged into a right angle, must be exactly a right angle or they will bind when the cylinders rotate. This need for orthogonality applies to the cylinders as well.

However, once running it's a real crowd generator at shows. I even had one fellow who, watching it rotate, said it couldn't possibly work. Of course, he was the same guy who insisted that the grooves in the rope engine had to have a non-zero helix angle. They don't.