ArtMetal

Manganese bronze propellers have been in common use since the invention of the screw propeller in the 1800s. It may have more to do with the guy coming into a cache of old propellors than choosing the material. They used to come up on auction once in a while and I saw people get the them for pennies a pound. (quite the investment, eh?)

Extolling the virtues of whatever you happen to have makes a good sales pitch.

G.

Gene Olson
Sculptor
Elk River, MN