RE: Reduction gearing.
You really have to experience the problems with reduction setups to appreciate what a pain in the arse they can be
I have done the following types:
OS 60w/ gear (a half dozen of those wavering wild screamin banshees.
They used a hunting tooth arrangement -which means the gears constantly cycle thru all the teeth
This means the prop is in a different position each time the engine fires -so it sets up a horrific undulating noise
A pair of Wankels on Gilmer belts -- Unreal performance 2-1 gearing -drank glo fuel like it was a dehydrated elephant.
A horrible steel geared Webra setup .60 - not worth mentioning ---
The weight to power is simply dreadful on most of the gas setups I have seen - but at least you may get to spend a lot of time screwing with one -------------