A nice resin engine is supplied. I drilled an .032 hole for the propeller shaft and another hole in the firewall so I could us a long shaft for more security. The propeller is molded as a hub
with separate blades. I drilled the hub for the shaft and added some small plastic disks to simulate the counterweights for the pitch change mechanism. I made a plastic disk and placed
it behind the cylinders to simulate the cooling baffles which are actually between each cylinder. I should have made the disk a little larger as if you look the wrong way you can still
see a little daylight out the back of the cowl.