Grenader
The Yellow spit is a MK XIV so it’s a griffon spit with the longer cowling. But it has the same fault all kits and all ARF's has except this composite MKIX has. They all lack a proper Gull section.
A geared engine would fit into most warbird cowlings as it could be mounted upright and with a cooling system that could reduce the need of unsightly openings in the cowling. I would certainly be very interested in such a proposition.
And to top it of being able to use a multiblade scale size propeller for flying yess
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Using a four stroke engine with gear in the Aviation design MKIX would make this an almost perfect match. Big four blade prop easy solvable exhaust. The only problem is as always cooling.
I had a KMP spit with RCV90 four stoke witch fit inside the cowling and when flying in 30 degrees centigrade the nylon engine mounts melted
And there is one thing to think of a Merlin was designed to run at about 100 degrees centigrade and the radiators and oil coolers were designed with that in mind.
What temperature can our model engines live with?
Santa is packing as we speak