T'aint
I am aware Robinson derates its engines in both 22 & 44. the question is why?? Is Robinsons cooling fan inadequate? Will the airframe or power train not take it? When Frank did the design, was it the only engine he had in stock?! It seems slightly pointless to use a big expensive engine and strangle it when a smaller one could do the same job and use less fuel and be cheaper to overhaul.
And while we are on the subject of limits, how come Enstrom can turn an O360 at 3050 RPM without it falling apart? If you did that to a Beta 2 engine for 10 seconds you would be facing a large bill for an overspeed. Ask Nr Fairy.
Now there's a thought, An Enstrom HIO360C1A engine in a R22, Should be a pretty easy conversion. It should more or less bolt straight in. Fuel injection, no carb heat, 205BHP. Loads of power. Could be a Beta 2/2. How about it Frank.
I have a spare Enstrom engine if anyone wants to try it.