Is that the Hughes with the center cockpit and aft cabin, kind of a Bill Trip Columbia 36 knockoff? That boat has an awsome layout if it's the one I'm thinking of. Is yours the shoal draft model that drew 4' or 5.5' draft?
Unless you own a custom hydraulics shop and have ready access to a large inventory of surplus parts, the hydraulic approach is only going to be more expensive and less efficient. Really kewl, but still more expensive and less efficient. The pump and the motor will definitely lose at least 20%, then you have to find a way of disipating all that heat that is your lost efficiency so you might want to figure in some kind of auxillary water cooled heat exchanger if you plan on running it hard. All complicated and expensive.
Serial hybrid is the way to go. Depending on whether you plan on operating as sailboat with auxillary motor or a motorboat with aux. sails you probably want a 10-20hp diesel genset making the juice for a 10-20kW electric motor driving the propshaft with a belt and pully system for necessary rpm reduction, add solar and battery capacity to suite your own taste and budget.
Even though it seems a little counter intuitive, serial hybrid is the most efficient and versitile configuration you can get. That's why the cruise ships, tug boats, and locomotives all do it this way. What's new now a days is that you can readily find the hardware you need to scale it down to pleasure boat size. There are lots of good options from all over the world from multiple vendors on the internet.
Carter
From: reesekc <kcr@kcrproducts.com>
To: electricboats@yahoogroups.com
Sent: Saturday, May 18, 2013 12:44 AM
Subject: [Electric Boats] Hydraulic motor drive with Hybrid Electric and Diesel Motors
To: electricboats@yahoogroups.com
Sent: Saturday, May 18, 2013 12:44 AM
Subject: [Electric Boats] Hydraulic motor drive with Hybrid Electric and Diesel Motors
I have a Hughes 35.5 Sloop of which I just removed the Atomic Four motor with a V-Drive. I am planning to replace the motor with a hybrid hydraulic drive system. A hydraulic motor will be used to drive the propeller shaft; and to power this motor, I'm planning on installing a 3 HP electric motor with pump; as well as an 18 HP diesel also with a hydraulic pump. The plan is to connect the motors in parallel with check valves to prevent back flow, so the motors may be used independently or together.
The electric motor will be supported with solar panels and a small battery bank. The diesel motor will drive a larger pump and of course have an alternator for general electricity and recharging the batteries.
I believe the hydraulic pump/motor system is simple and reliable, and I also like the idea of hybrid power system which greatly reduces the battery bank size. I've done a search through past posts, but I could not find much on "hydraulic motor driving a propeller". If anyone could steer me to a previous thread, or if anyone has some comments on the plan, I would appreciate input.
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