Saturday, May 18, 2013

Re: [Electric Boats] Hydraulic motor drive with Hybrid Electric and Diesel Motors

 

I have no experience with hydraulic systems at all,  I have seen it discussed in the past. Vetus does make such a setup see link below.  From what I could see from the previous threads the down sides seem to be cost (hydraulic cost a lot more then belts or planetary gears) and space ( you need a large fluid cooling tank to use hydraulic for traction application.)   The upsides being flexibility in engine location.   




On May 17, 2013, at 11:44 PM, reesekc wrote:

 

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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