Wicked Uncle Nigel wrote:

You'd need to boost the low and midrange torque to swing a prop, as
props rotate relatively slowly, don't they? I think a 'Busa engine
would last forever is detuned to 130bhp.

Depends on the prop, but I would think that gearing down would be the
way to go.

If you're forced to use a higher-revving engine, yes- but gearboxes
or belts and cogs introduce problems of their own, which is why a
relatively large displacement slow-revving engine (which doesn't need
four valves/cylinder, multiple chain drive cams with cam chain
tensioners, etc.) makes a lot of sense for aircraft.