Light-Sport Aircraft Yahoo group Re: Can cruising the Rotax 912 a bit below 5000 RPM actually INCREA

Yes Alex its true. But cruising at 4800 RPM versus 5000 RPM isn't going to make much difference.
Rotax ideal cruise is -between- 5000 RPM and 5500 RPM, not just at 5500 RPM. You are close enough to 5000 RPM solo. Don't sweat it.
If you were at 4000 RPM all the time, I would do something to change that.
Abid

--- In Sport_Aircraft@yahoogroups.com, Peter Walker <peterwalker58@...> wrote:
>
> Hello
> No you are running at a lower power setting Cylinder pressure and temps are lower 
> The higher wear occurs if you repitch to a faster prop and run less revs for the same cruise In that case cylinder pressure is higher and hotter 
> Peter
>
>
> <acenInbox 57312sor@...>
> To: Sport_Aircraft@yahoogroups.com
> Sent: Friday, December 23, 2011 3:12 AM
> Subject: Light-Sport Aircraft Yahoo group Re: Can cruising the Rotax 912 a bit below 5000 RPM actually INCREA
>
>
>  
> Ed,
> As Michael said :
>                   Yes Ed, nobody is recommending "lugging the engine".
>  
> As the guy who posted the original question I had already mentioned that when speaking of running below 5000 RPM and wondering about the claim that this could cause more wear I was NOT lugging the engine.
>  
> In my Skyranger with me (weighing only 140 pounds) soloing at 4800 in level flight we are not in any sense lugging.
> Low RPM does not necessarily mean the engine is lugging ---- no more so that when you cut RPM on approach.
>  
> So I still have the question --
> Is it REALLY true -- counterintuitive though it may be -- that I am putting more wear on the 912 engine cruising my lightly loaded plane at 4800 RPM rather than 5500?
> And if so, is the wear significant enough to worry about ....... As I do save a great deal of fuel and increase my range significantly by cruising slow.
>  
> Alex
>

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