"Montblack" wrote in message
...

Aluminum will weigh 5 x the mahogany? Wow.

Specific gravity of Aluminum = 2.7
Specific gravity of Mahogany = ~.5

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

New Ed Sterba Birch prop ~ $600. New Sensenich Aluminum $2,000. These are
rough figures.

Why do people buy birch instead of mahogany?

Birch has a specific gravity ~ .7 and is a lot stronger per pound than
Mahogany when used for a prop.

Rich S.