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  #31  
Old 08-01-2011
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Quote:
Originally Posted by tdw View Post
Cameron,
Virtually all of the big boy's toys these days have their engines running all the time in order to power such things as canting keels plus of course the plethora of electrical gear.
??? I never noticed..

Must take a closer look next time the TP52's are out on the water.
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  #32  
Old 08-03-2011
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Quote:
Originally Posted by mgunning View Post
Also most electric propulsion users select the largest prop possible to take advantage of the benefit of the electric motors torque.
Racers will do almost anything to win including painting a wood anchor galvanize to reduce weight but still pass the anchor requirement.

I wonder if anyone has rigged a quick release on the prop so someone could dive on it and pop it off.
The fact that I thought of it and it is possible means someone has done it.
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  #33  
Old 08-03-2011
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I just googled it and found this:
How did Rescue Minor's quick release prop work??
Told you!!!
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  #34  
Old 08-07-2011
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Boat: 1971 Coronado 35
Motor: Mars Brushless 8KW
Controller: SevCon Millipak
Batteries: (8)Trojan T-105
Charger: 48v Golf Cart charger

Unfortunately I haven't had the opportunity just yet to get the boat in the water. I'm hoping to get it in next month ( crossing fingers )

The reason I went with electric: The boat had no current motor in it and I had started searching for alternatives. I am an Electronics Technician in the Navy and have absolutely no knowledge of Diesel engines so I decided on the electric motor. The Motor/controller/batteries and charger all came from one guy who had purchased the kit and decided to go a different route. I took it all off his hands for $2k.

I will post more of the performance when I get a chance to actually use it. Right now i'm using the two bladed prob that was already there but looking to get a larger 3 bladed.

Chris
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  #35  
Old 08-08-2011
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Hi Chris,

Are you going to make the mounting frame and reduction or is it all together in a unit already?

Good luck with your install.

Mark
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  #36  
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The kit came with a 2:1 reduction setup. Looks like the same one ElectricYacht uses.

Link to Photo

Last edited by optikul81; 08-08-2011 at 09:09 AM. Reason: Editing link to photo
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Old 08-08-2011
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Hi Chris,

That's quite a score for $2000. Do you know who made the setup? I like the heat sink for the controller. How is the unit switched (throttle &forward/reverse)?
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Old 08-08-2011
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Quote:
Originally Posted by mgunning View Post
The issue here is even more complex for the race committees. Here is something we have experienced. The electric motor propulsion system has a greater drag than a free wheeling diesel with a like prop. Also most electric propulsion users select the largest prop possible to take advantage of the benefit of the electric motors torque. How do you address the issue that when racing with an electric system there is no free wheeling of the shaft and there is a regeneration possibility. This happens for most at around 5 knots and is a benefit to the cruiser but it does slow down the racer. It is possible to install a disconnect but seems to be an item that is of little use to most sailors. It is possible to use a feathering prop but you likely will lose regeneration capabilities.
Mike
With a lot of the feathering props you can "trick" them open to achieve regeneration. To do this when you are sailing, but the motor in reverse to open the prop, then neutral. The drag on the prop will keep the prop open and start regenerating. To feather the prop, simiply shift forward and then neutral and the prop will return to the feathered position.

-geoff
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Old 08-08-2011
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Greetings Chris,

It is an Electric Yacht frame and it looks like someone bought a Mars brushless motor and Sevecon Millipac controller and adapted to the frame. If you have questions installation, let me know. I can probably help you.

My electric boat:
1976 Cal 3-30
Displacement:10,500
loa: 30'
lwl: 26.5

Motor: Electric Yacht 100ibl
batteries: 130ah 48v lithium

power draw:
20amp 3.5 knt
80 amp 5 knt

-geoff
home | straightturn.net
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  #40  
Old 08-08-2011
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Quote:
Originally Posted by optikul81 View Post
Boat: 1971 Coronado 35
Motor: Mars Brushless 8KW
Controller: SevCon Millipak
Batteries: (8)Trojan T-105
Charger: 48v Golf Cart charger
I will post more of the performance when I get a chance to actually use it. Right now i'm using the two bladed prob that was already there but looking to get a larger 3 bladed.

Chris
Sounds like a nice setup. I have heard that the right prop buys about a knot of speed so would like to see if that holds true in your case.
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