Don Dunbar wrote:

Hi Pual,
There has been much talk about psru ratio's and engine matching!
I would like to join this debate but would like find more information to
understand the problems and efficiencies associated with all the trade
off.
I was looking to use a 3 blade MT variable pitch propeller. Does any one
have data on the theoretical efficiencies of propellers throughout the
RPM range.
Regards Don

Here are some charts.

Paul Lamar
 
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