My question is addressed to those with a Rotax 912S and VP prop combination. I
believe that 75% power equates to 18.5 litres / hour in the cruise. In my
Classic
Europa tri-gear, this gives 115 to 120 KIAS cruise and is generally achieved
around 4700 rpm, which agrees very well with Kevin Dilks' suggested rpm "sweet
spot". Certainly I don't enjoy the louder and less smooth cruise at 5000 rpm.
So my question "What cruise power settings do you use and how do you know when
you're at 75% power with a VP prop?"
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