>
> At http://flymall.org/aircraft/docs/FAQs-on-Rotax.pdf
> it says,or at least strongly implies, that cruising at less than 5500
> RPM will wear the engine MORE.
>
> Although we do cruise climbs at 5000 to 5500 we often level cruise ours
> down in the 4300 to 4800 range when not in a hurry to get somewhere.
> We're both lightweight pilots and that's plenty of power to stay aloft
> in level flight at our loading. Uses less fuel, makes less noise, and
> figured for sure it would increase engine life.
> Despite their explaination on that site of why 5500 is optimal, it
> still seems suspicious and doubtful to me that 4600 RPM wouldn't be
> less wear.
>
> Anyone have, thoughts, knowledge, or experience on that?
>
> Yeah, I know the 912 shouldn't be ideled below 2000 RPM -- that's not
> the issue I'm concerned about.
>
> And I'm not talking about an engine that's running at below 5000 RPM
> because it's overloaded (for example if the prop pitch has been set too
> high.)
>
> Any ideas?
> Alex
If it was my engine Alex,
I'd be very happy with it running between 4000 and 4500.
(and that's with a fixed-pitch prop)
Mike
.
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