When I finaly get around to doing a Hawker Typhoon for F4B scale, it will almost certainly have a geared reduction drive system to turn a near scale sized prop in the scale direction at the correct speed for flight.
With some of these huge engines now emerging under the new rules, we're seeing 16" props at under 7000rpm. I suspect a small engine with a reduction drive might be able to acheive the same thing with a possible weight or cost advantage.
Assuming weight and cost are not a detriment, does anyone have any thoughts on the viability of the idea in stunt?