Join Date: Feb 2003
Location: New England USA
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Jeanneau 36 Steering Under Power
"Torque" steer is something that is pretty much determined by the vessels design. On my Morgan designed sloop, she has a wonderfully balanced helm under sail and is an absolute BEAR to drive under power. I had to make time in light winds a couple of years ago, and my Autohelm was acting up due to build up of corrosion on the connections. After a 6 hour stint at the tiller, I ended up with rotator cuff damage in my shoulder from the constant strain. (Last time I take a passenger on who "Has" to be back to shore for a flight home) I now carefully inspect my Autohelm connections regularly.
I would think that a 3 pladed prop might even make things worse, more thrust=more torque, but would even out the vibrations. Being that the vibrations are the pulses from your 2 bladed prop. Addtionally, if it is a fixed prop, would you want to sacrifice your light air performance with the extra blade? And if you are using a folding/feathering prop, there is the additional expense in both purchase and upkeep.
If you are satisfied by the boats performance under sail, (I mean we are talking sailing here, not stinkpotting) and she makes good way under power, I would stay with her current prop.
Good luck, and don''t forget to hire a licenced marine surveyor prior to purchase, even if she had passed a "Recent Survey" with flying colors.