is it out of a blower or a weedie? those convert easy using the magneto ignition as all the prop adapter is is a spacer, with the shaft sticking through the prop and the stock nut with a washer holding it on... running on gas/glow can be a lot more compact, I would run a die down the crank then shorten it to your tastes, the cranks are just mild steel nothing fancy.

I still haven't ran either of mine, so I don't know how it'll run.