[bostick29412]

On the 14' skiff I'm finishing up (The Fidder), I've got a 1987 Mariner 20 hp that's pushing her along nicely. It's got the original aluminum 3-blade prop and I want to upgrade to Stainless. I don't have the exact size in front of me, I know it's a 10-spine prop.

One question is, will a 4-blade prop reduce torque steer (it's a tiller-steer motor)?

Toss in your opinions here on my best options.. thx.

 

[Brett]

Does your lower unit have a torque adjustment/zinc anode tab?

 

[RShrimp]

Tourque steer can be greatly reduced by trimming the motor.
Play around with the trim rod. On my J12 I found that the 3rd hole provided very neutral steering. The PO had it set all the way down and it was a bear to steer.
(Check the Simple (read cheap)stuff first!)

 

[The_Skiff_Shop]

The question is very general so I'll offer the same with the answer. A 4 blade prop will typically increase torque steer as a result of raising the motor for shallow water performance but your conditions may differ.

 

[bostick29412]

Does your lower unit have a torque adjustment/zinc anode tab?

I honestly don't know! I don't have a manual for it.. should be the same as a Merc. of the same vintage. I'll check it out - along with the other suggestions.

 

[Brett]

Crowley Marine indicates that you should have an anode/adjustment tab...

http://www.crowleymarine.com/mercury-outboard/parts/274_190.cfm

That's part number 39, steering torque is eliminated by setting the tab to the correct angle.

explanation of procedure...

http://continuouswave.com/whaler/reference/manual18-25/operations.html#trimTab

 

[bostick29412]

You are the man, Brett. Thanks.