From the Rotax owner's manual and according to the advice I received from a well-known Rotax guru, the 912ULS "sweet spot" is 4800 rpm at 26" MAP, which gives 65% cruise power (60 HP) and burns 18 L/h. I achieve exactly this fuel burn at this power setting when adjusting my CS/VP prop manually to 4800 rpm and 26".
In calm air this provides 118 knot cruise S & L in my tri-gear Europa without wheel fairings (spats/pants). The altitude to get this indicated airspeed is around 1500 ft. Earlier in this topic I erroneously stated 75% power.
By the way, on average Europa tri-gears are about 16 kg (36 lbs) heavier than mono-wheels.
Last edited by Colibri49; 23rd Sep 2017 at 09:03.