I am currently looking at replacing the engine in my plane with a
rotary one. I had thought to use a single rotor unit but I have been
given the chance to get a almost new Renesis one (<10,000 Km). I have
looked up the net and found the spec of the engine I would set the
max revs at 4500 rpm (for take off) and cruise < 4000. Can anyone
suggest a ball park for fuel consumption given the average altitude
would be < 2000 Feet ABMSL Col Dale
Kind of heavy for direct drive and only 120 HP. A 4500 RPM prop or
ducted fan is very inefficient.
That means your MPG will be horrible. A rotary NEEDS a gear box.
Paul Lamar
Sorry Paul I didn't mention I would be using a gear box. I plan on
having the max prop revs at 2500. Another identical a/c with a 106HP
engine with 2500 RPM could exceed VNE of 140Kn so I just took the
figures of a published torque/HP graph for the Renesis which is where I
got the 4500 take off rpm and 4000 for cruise. Do mean the engine
running at the lighter load will be heavy on fuel? In this case would I
be better to convert it to a single rotor engine and run at a higher
speed to reduce the fuel usage. I have had nothing to do with rotary
engines before so things that may be obvious to you experts are not so
to me. Any input is greatly appreciated.
Col Dale
It depends on your intake runner length. The best BSFC always
occurs at peak torque which is the
same as peak Volumetric Efficiency (VE). This is the same for
piston or for rotary.
To cruise efficiently at 4000 the intake runner length should have
to be about 3 feet long.
Paul Lamar
Better to build or see about buying a single rotor(Atkins) with Al end
housings and a PSRU. About 125HP will give good takeoff. Just watch your
air speed and back out of the throttle to control speed.
Dale Davies
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