[link=http://www.eifflaender.com/]PAW site[/link]

Fuel mixes and prop sizes can be found here. Also great general instructions for starting and running.

Your Deezil would run a 9x4 wooden prop. Maybe 10x4. Fuel mix would be "Olde English" -- equal parts of castor oil, lamp oil, and ether. Easy to mix and should run anything.

The contrapiston fit sounds great. When you start flipping a prop the contrapiston should move up from the combustion pressure when the compression screw is eased back while the engine is running. Get the contrapiston back to the top of the cylinder and slowy screw it down in 1/16th or 1/8 turn increments when you get to the point where you want to do some flipping wet with a prime of Olde English. Flip the prop with only a priming squirt in the cylinder until you get it to fire and perhaps run out the prime. You will avoid risking hydraulic lock and bent and broken internals from flooding the engine by flipping without a tank of fuel. Only when you can get it to fire and run out the prime regularly should you connect a whole tank of fuel to the engine.