Hi all,
I'm new to the forum and have a question for any one willing to help.
I have an old 70's plywood Piver trimaran, it is a 40' Victress that is 23'
wide, at some point in the near future I will be replacing the dead 30hp
Yanmar with an electric motor. I have no idea what the displacement is, I have
a copy of the original plans but it does not say, in the keel next to the hull
# is engraved " net 20" so I'm not sure if this means 20,000 lb displacement,
but that seems too much. At it's widest point the main hull is 67" wide at the
water line, and the bottom of the keel is 33" below the water line, and the
length at the water line is 34'9". the ammas are a deep V with maybe a 12-14"
draft and LWL of 24'. I don't know how to calculate displacement and I'm
assuming we need this to determine motor size. While I need to figure this out
it is not my main question.
I am thinking of adding a small motor to the rear of each amma to act like bow
thrusters or the twin motors of cats in order to make maneuvering at slow
speeds possible for docking and directional control while retrieving the
anchor. I am wondering if an electric trolling motor wired to a bigger battery
would be big enough to handle this task. Several trolling motors were labeled
36 lb's of thrust, what does this mean and how does it relate? would these two
trolling motors mounted to the transoms of the amma's get me out of the marina
until I can set the sails? I like the idea of the trolling motors as they are
kept cool by the water and I can pull them above the water line to eliminate
drag while sailing.
Any ideas would be appreciated,
Bruce, S/V Araluen.
Posted by: "Bruce Dickson" <bdebiz@usa.net>
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