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About time I posted. I am an engineering teacher and get my senior students to make a little wobbler as an exercise in accuracy. As such I get to make one each year. To add a little challenge to myself I designed and made a double acting one. Then I found this site. I have always been fascinated...

I know you pain. I have just spent about sixteen hours making a wooden propeller for a rotary engine, had it running in a balance test and knocked it with some pliers and broke off one blade. Just going to the shop to buy another one.

I have found that a filed flat end of a suitable rod with blue tack gets you started, then a flat blade screwdriver wedged against the flat of the nut to hold it still. I also use screw heads rather than bold to overcome the small spanner problem.

Hello all, amazing what a google search for Gerrys' engine turns up. I am an engineering teacher and build single cylinder wobble engines with my senior students. I decided I needed a bigger challenge and found Gerry's plans missing the pages. "How hard can it be?" First needed to learn to read...