I would perfer a Diesel/jet A engine but weight and cost will not allow it!!!
Corvair conversion
My RH block is in the shop and ready to be torn down
There will be many modifications to make it a flight worthy engine.
3 liter 120HP+ w/ 5th bearing
Click here for the Corvair build page
(Picture shows a 100HP engine)
www.flycorvair.com for more info
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N2 Turbines
Very small light weight turbo prop I love the idea, but it's not in production yet (if ever)