"Montblack" wrote in message
...
To save weight, if an alu prop weight 30 lb. a birch will be 7 lb.,
mahogany
5.5 lb.

for efficiency, use the aluminium!

Jan Carlsson
www.jcpropellerdesign.com


Aluminum will weigh 5 x the mahogany? Wow.

At 100-110 mph how much (WAG) efficiency would the wooden prop lose, on
say an Ercoupe?

What's the cost difference between aluminum and wooden props?

Why do people buy birch instead of mahogany?

Cool, a prop person g


Montblack

The wood prop is probably 3 to 5 percent less efficient, especially in
climb.

A new sensenich wood prop is about $1500. A metal prop is twice that.

Birch is more readily available and stronger and cheaper. Aircraft mahogany
is real hard to come by any more. It has to be real mahogany, not "luan" or
some other tropical wood that looks sort of like mahogany.

Highflyer
Highflight Aviation Services
Pinckneyville Airport ( PJY )