I don't want to get ahead of myself, but the single run of the original Quarter Scale prototype memorialized on Youtube by its original designer, was made without a prop. With a cylinder firing every 60 crankshaft degrees, the inertia of the prop probably isn't as important for keeping an engine running as it would be on a one or two cylinder engine. Most of the V-4 and V8 models I've seen don't have significant inertial loads.
I don't think I'd try running one of my radials without its prop. Those engines would probably heat up pretty quickly without the prop wash to cool them. It's pretty scary standing close to either of them, but especially the 18 cylinder, while it's running. If I'm lucky enough to get the Quarter Scale running, it'll probably be even scarier. - Terry
Last edited by mayhugh1; 04-19-2017 at 09:27 PM.