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1. 04:59 AM - Re: Maximum Continuous RPM for a Rotax 503 (Thom Riddle)
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| Subject: | Re: Maximum Continuous RPM for a Rotax 503 |
Lee,
No. The RPM limitations that Rotax put on their engines do not care
what prop you use and they do not change based on what prop you are
using. They are absolute numbers that refer to limits that the engine
components are designed for.
It means your engine can develop only 6200 rpm (assuming this is at
wide open throttle in straight and level flight) because there is a bit
too much load on it from the high pitch propellor. This is good for
economical low density altitude cruise flight as long as your EGTs are
in normal range. But not good for high altitude operation or for
extended climb perhormance. At 6200 RPM your engine is not developing
its full power and the power it does produce will drop as you climb
into thinner air and you will probably see the max rpm drop even
further as you climb. If your engine is turning 6200 rpm at best climb
speed that is another story and the pitch is probably about right. For
high altitude flight, if you have a ground adjustable prop, it would be
good to set the pitch to get close to 6700-6800(max) rpm in straight
and level flight at low altitudes.
Thom in Buffalo
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