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

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

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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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