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mehitabel's motor system

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  • 21 Aug 2015 16:21
    Quote
    Reply # 3490537 on 1152590
    Deleted user

    Hi Kurt,

    I's been a while since we spoke about electrics.  How has your system been treating you?

    I have a question for you:

    We've been running on electric since we last spoke (2013?), with success.  This is the same 10.5kW system you have, but mated to a Sabb Controllable Pitch Prop transmission. 

    We live on a tidal river, and when all is said and done, we get 3 kts @20A (48V) with a steady-state charge on the batteries with the Honda generator running.  The chargers hardly get the generator above idle.  We are considering a transfer switch/transformer system where we can run right off the generator and bypass the batteries for those times we need 30 or 40A for a long time.  Ever heard of this being done?

    John Cornicelli

    Last modified: 21 Aug 2015 16:22 | Deleted user
  • 30 Jan 2013 14:41
    Quote
    Reply # 1193389 on 1152590
    Deleted user
    While I have recently installed a motor on Easy Go I will always keep the yuloh on board as it has never failed me yet.

    Sailing into a slip is not as daunting if one has a stern anchor that they can let out on the way in then use as a brake coming into the slip. Leave in place on the bottom and reverse gear is there when you want to back out. 

    I sailed into the travel lift basin at the Lunenburg Ship yard  by coming close to the end of the slip, heading to wind, dropping the bow anchor and drifting back in front of the slip then backing in. A little help from a line thrown to a helper on the upwind finger and we were in. Sounds trickier than it is. Quite satisfying to maneuver under sail alone. This was particularly satisfying as it was the middle of December in a Canadian winter. Ice in the sails and all the lines very stiff. Great end to a good year of cruising.

    I have also sailed backwards out of a slip then turned the boat to get a beam wind to switch into forward. It certainly will get the attention of everyone near by if you try this.

    The yuloh is great for getting in and out of places in calm conditions but after a mile or two can get a little tiresome, but when my motor fails (not if) I'll still be cruising.
    Last modified: 02 Feb 2013 19:45 | Deleted user
  • 30 Jan 2013 02:37
    Quote
    Reply # 1192964 on 1192634
    Deleted user
    Kurt Jon Ulmer wrote:Hi Jeff,

    Imagine for a moment, that in place of a refrigerator compressor, or a second propulsion system belted onto the propeller shaft, or a diesel tank that can never be serviced, or any other contrivance that takes up space and needs servicing, even any diesel motor at all... you had...


                        air



    We enjoy having a lot of it, and it neither gets in the way nor ever needs fixing and it floats.

    In a smaller boat, its value might be even higher.

    Cheers,
    Kurt

    A good point, but I'm too chicken.  The biggest boat I've ever sailed was a 17 foot open sloop, pointy flavor, and that several decades ago.  It didn't have a motor; if I needed to "power" it into some crowded slip or somesuch I sat straddle the bow and paddled with a short handled paddle.  There'd be none of that with 8,000 pounds of Seablossom and the bow a meter off the water.  I could try a yuloh, but I'm not sure how I'd back out of a slip with one.
    There isn't an ocean around here, and in truth probably not one in my future, so it's lakes and marinas and the tools to make them usable.  I hope to sail into a slip one day, but so far I have never even seen anybody attempt it at the marina I'm most likely to use.  Of course, they don't have junk rigs.  :-)
  • 29 Jan 2013 18:51
    Quote
    Reply # 1192634 on 1152590
    Anonymous member
    Hi Jeff,

    Imagine for a moment, that in place of a refrigerator compressor, or a second propulsion system belted onto the propeller shaft, or a diesel tank that can never be serviced, or any other contrivance that takes up space and needs servicing, even any diesel motor at all... you had...


                        air



    We enjoy having a lot of it, and it neither gets in the way nor ever needs fixing and it floats.

    In a smaller boat, its value might be even higher.

    Cheers,
    Kurt

    Last modified: 29 Jan 2013 19:02 | Anonymous member
  • 23 Jan 2013 00:25
    Quote
    Reply # 1186286 on 1186045
    Deleted user
    Ketil Greve wrote:

    Hi,

    When you dream, have a look at www.greenstarmarine.se. They have been around for quite a while as OZ-drive. When I lay my 2 Buhks in the grave, this is what I would go for.

    Ketil

     

    Pretty, but not hybrid.  If I ever do it I'll go hybrid.
    The propeller shaft in the Nor'Sea is so beautifully exposed for a hybrid.  There's a sump at least a meter long that runs along inside the keel from the engine room aft to where the propeller shaft enters the cutless bearing and exits the boat, with the prop shaft in that sump, below the cabin sole.  all it would take would be to mount an electric motor on a stout aluminum angle bracket, take a split belt pulley, mount it as a driven pulley to the propeller shaft, and put the appropriate driving pulley on the motor.  That whole apparatus would go under the aft cabin companionway.  Hook up batteries and controller electronics of course.  The motor wouldn't have to have provision for a thrust bearing because the engine's transmission has one.  It's just begging to be custom built.
    Someday.
    Last modified: 23 Jan 2013 00:26 | Deleted user
  • 22 Jan 2013 18:59
    Quote
    Reply # 1186045 on 1152590
    Anonymous member

    Hi,

    When you dream, have a look at www.greenstarmarine.se. They have been around for quite a while as OZ-drive. When I lay my 2 Buhks in the grave, this is what I would go for.

    Ketil

     
  • 22 Jan 2013 17:14
    Quote
    Reply # 1185939 on 1185672
    Deleted user
    Kurt Jon Ulmer wrote:
    G'Day,

    ...

    It's still possible to make your own smoke.

    Kurt

    Yes, but remember never to let the magic smoke out of the wires!  ;-)

    On a more serious note, I still have a long-term dream of mounting an electric motor over my prop shaft (nicely exposed and accessible in the Nor'Sea's keel) as a parallel hybrid, in which I can run the electric for propulsion or run the diesel for propulsion with the electric performing generation functions.  I would, of course, take the existing alternator off the diesel.
    And before anybody tells me Whoa! Mule! don't worry, this is a long-term dream.  I have to finish a bunch of other stuff first.
    Last modified: 22 Jan 2013 17:17 | Deleted user
  • 22 Jan 2013 08:36
    Quote
    Reply # 1185672 on 1152590
    Anonymous member
    G'Day,

    My friend has 2 Thoosa systems in his sailing catamaran. They were started by ASMO Marine awhile ago. They use motors from Lynch Electric Motor Company, whose Cedric Lynch left the firm and is now working as Agni motors out of India. Name-dropping, I shouldn't omit Sevcon in the UK, who make electronic controllers for electric motors.

    Brushed DC motors can be run directly off battery, in a pinch - an advantage I haven't missed yet but might one day...

    Brushed or brushless motors can be spun by fuel-burning motors to generate electrical energy to charge batteries and/or provide power to a running electric drive system. Finding any documentation (rpm & voltage specs, safety, test results) is not easy, however. 

    It's still possible to make your own smoke.

    Kurt

  • 19 Jan 2013 00:37
    Quote
    Reply # 1183375 on 1152590
    Anonymous member
    Here's another source of electric drive  that I've just come across:
    Based in Denmark, with an agent in the USA, they sell both brushless AC drives and Brushed DC drives. They quote the life of the brushes as 4000 hours (and of the final drive belt as 3000 hours). My motor has 3300 hours on the tacho, in a well-used boat, over twelve years, so I wouldn't be worried about brush life.
  • 06 Jan 2013 01:53
    Quote
    Reply # 1172569 on 1152590
    Deleted user
    Like you said...educated guesses.  We are close to 18k, but on a lark I looked at some extreme cases of sister ships with higher displacements to see what they would use, to get an idea of thrust needed vs a current.  I really appreciate all your help.  I am going to have a look at ThunderstruckEV like you suggested. 

    1. Ciao!
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