Aluminum vs. Bronze props

[John Reynolds]

Question for the propeller experts: Is there any practical differences between Aluminum and Bronze props? I have both available for my Merc. Mark 55E and I thought that perhaps because there is such a large weight difference between the two, it would effect operating parameters.

 

[DJ]

Re: Aluminum vs. Bronze props

John,<br /><br />There would be very little performance difference, assuming both are of the same size and pitch.<br /><br />I'm not a fan of bronze, especially if the boat is left in the water for any period of time. Bronze sets up galvanic action very quickly.

 

[John Reynolds]

Re: Aluminum vs. Bronze props

I have two props, both the same except for the metal. I figured that perhaps the bronze would provide somewhat of a flywheel effect due to it's mass, and that due to it's lack of mass, the aluminum prop might be faster to respond?????

 

[DJ]

Re: Aluminum vs. Bronze props

John,<br /><br />Your assumptions are on track. The bronze will also experience less blade flex.<br /><br />Unless you have a real hot set up, I doubt you or I would ever notice the difference.