I would call the people you got the prop from and ask them.
One reason I know would be to help overcome the torque of the prop. These
props add steering torque due to their rake and cup compared to an aluminum
prop. If you don't have power steering you would have to hold onto the
wheel all the time or properly adjust the trim tab. In your case - you have
power steering so not an issue.

Another possibility is I have seen where the trim tab was too long and hit
the blade of the prop on certain props that were deeper from front to rear
and touched the tab. Again in your case not an issue as you don't have
one.

Another possibility but this is a long stretch is years ago the tab was also
used to deflect water onto the hub of the prop to help cool it to prevent
hub failure. This is from the old days and should no longer be an issue.
As I said, this is a long shot.

Call and ask.
--
Tony
my boats and cars at http://t.thomas.home.mchsi.com


"mgg" wrote in message
. ..
I just replaced my prop with a SS Stiletto. A red piece of paper
accompanied the prop that reads:

Due to the performance enhancing nature of the design, Quicksilver Trim
Tab No. 46399A1 (or equivalent), must be used with this Stiletto Propeller
on your Mariner, Mercury, or MerCruiser engine to prevent damage and/or
injury.

I'm running a 4.3L Merc on an 18.5' Reinell, and the sacraficial anode (on
the anticav plate) has no trim tab (fin) on it. It's not a big ticket item
by any means, and I have no problem doing as they say, but I'm really
curious as to why?

Any insight? Thanks.

--Mike