I divided the climb rate by ten and multiplied the max speed and the
climb rate together. That is the first added column on the right.

"Robinson, Chad" wrote:

Paul, I can do the math myself of course, but it might be interesting for 
public distribution to add a column that shows the prop's max rpm based on 
the tips going sonic...

Regards,
Chad

Yes if I had the diameter. Unfortunately the article lacked a lot of 
pertinent data such as diameter and pitch. Can anybody find the original 
article in EAA  Sport Aviation mag and tell me the month and year. I might 
have that issue and I could scan it in.

The Senenich did well in the test indicating a thin airfoil
(only possible with a metal or carbon fiber prop) is the way
to go.

BTW one explanation for the CS props poor cruise MPG is it is going 
13 MPH faster at 2600 RPM cruise. Obviously the prop is in higher pitch 
and therefore the HP generated is much higher at 2600 RPM than the fixed 
pitch props. It would make more sense to compare props for MPG at a given
cruise air speed rather than some arbitrary RPM number.

Paul Lamar
 
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