The Thumb Fun Engine

ThumbFunEngine
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This handsome little engine is built using aluminum bar stock. It runs by just pumping your thumb up and down. If you have never built an engine, here is a project wherein you will learn to make a crankshaft; a connecting rod; and a flywheel. The engine is just 6” long. Everybody enjoys developing a rhythm to see the flywheel spin. Plans are six, 8 ½” x 11” pages, with all drawings full size. They include a color picture.

 

Instruction Book for building the Thumb Fun Engine
$8.00 + $4.00 S & H