changing pitch or new prop

18x15 prop needs to go to 18x10.

Prop man said no problem. I was wondering, how can a re-pitched prop match one that is made at the correct pitch? How do you match the pitch at the core? It seems that you would end up with some sort of hybrid pitch that is closer to the pitch at the end of the blades and a different pitch at the hub?

I know he is going to heat it up till its red to make the change.

thanks

 

I think my question is sort of related to this thread

http://www.boatdesign.net/forums/inboards/prop-blade-twist-24833.html

 

They will beat the blades to a pitch block.

Essentially, the propeller blade has one pitch (rh or lh) and the pitch block has the desired pitch.

The technician beats the propeller to make the blade parallel to the pitch block thus changing the pitch of the propeller.

There are limits to how much a propellers pitch can change safely (not stretch the metal until it tears) depending upon material. Stainless steel does not have the same yield as aluminum for example.