Re: Never before has so little power been made from so much displacement!
Wait, doesn't the stock plane cruise at something like 100-ish mph, running full tilt? I'd think if your average speed is 50-60, and you're only on the throttle half the time, the cooling may not be as much of a problem as it seems like. I thought that propwash over engines was minimal anyway, since most of the shove happens at ~2/3rds of the length of the blade.
I'm still for misting water both inside and outside the engine. It won't make too much steam and isn't covered by fuel rules. You can weld up a sheet from the gas tank bulge to the rocker cover and have a huge flat water tank in there.
This build is epic.