Aluminum vibrates, stainless doesn't???????

[Fordiesel69]

I have an insteresting one, and maybe this is normal. I bought my boat (in my sig) and it came with a stainless installed and a spare aluminum. The staninless prop runs smooth all the way up to top RPM. The aluminum one does not, I can hear and feel a high speed almost like a orbital sander type vibration throughout the rpm range. I had it rebalanced as it looked ok to start with. Still vibrates so I put the stainless back on.

I would like to run aluminum for saftey of the drive, but why does the aluminum vibrate?

Should I waste money on a new one to try?

 

[airdvr1227]

Re: Aluminum vibrates, stainless doesn't???????

The most obvious answer would be that the aluminum one is damaged somehow. Possibly bent or out of balance.

 

[hwsiii]

Re: Aluminum vibrates, stainless doesn't???????

Ford, there are many reasons that can cause that but it could be that the hub is off center in the prop, and since you had a prop shop balance it that would be my best guess, because they should have seen any blade problems.



H