All kidding aside, this is a fabulous vehicle and I am grateful to the guys at Volkyland for giving me a demonstration of the propeller mechanism and checking out the engine compartment. It is a simple solution to what seems at first hand like a complex problem. More about this cool museum on a previous post...
like this :-(
The propeller shaft (in red above) is just a simple extension of the crankshaft.
A pretty ingenious concept overall.