Monday, January 11, 2021

Re: [electricboats] New prop 10KW motor

Hello Guys,

I am following this discussion about regenerating power to the battaries through the prop by saling fast enough. I wonder if any of you have watched this serie of four real intresting movies on youtube.  This Bruce Wilson does regenerate power, while he is sailing. check it out, really intresting stuff!

This is Part 1 of a 4 part series interviewing Bruce & Lisa Wilson the owners of Waypoint, a 410 lagoon Catamaran that was manufactured in 2003. This vessel is from the production line was designed for electric propulsion. There were three Catamarans all were 410 lagoon and all had the 9 Kw Motors. The most important part is that after seven years the motors have no wear towards the 40,000 hours before bearing replacement.


Roland


Van: electricboats@groups.io <electricboats@groups.io> namens Carsten via groups.io <Carstensemail=yahoo.com@groups.io>
Verzonden: maandag 11 januari 2021 02:30
Aan: electricboats@groups.io <electricboats@groups.io>
Onderwerp: Re: [electricboats] New prop 10KW motor
 
It seems that some of you have actual experience with letting a fixed prop and motor "wheel" when under sail !
This is an option for daycruisers, but probably not for ocean cruising.

Any of you have some data (prop size and pitch, speed, Watt input) to make the prop spin for "no drag" ?

Peter Zephyr, you wrote : "in this situation the prop actually generates electricity and charges the battery".
If you send power to the prop, how can it generate power ?
Very interesting, so please enlighten us.

Carsten


On Monday, 11 January 2021, 01:34:35 GMT+8, Matt Foley <matt@sunlightconversions.com> wrote:


Michael, 

 With a traditional diesel engine, its kind of all or nothing. Typically you are either sailing or motoring. Motors sailing is an option but generally not an enjoyable one. 

With electric you will find yourself almost almost always motor sailing. Lets face it, the wind is usually not quite as strong we would like. If you want to make your prop "invisible" it doesn't take much power at all. If you want to add a little speed, help point higher and get you through lulls, it takes just a little more power. 

For those reasons, I recommend going with the most efficient prop you regardless of drag. This way you will have the more range when needed and still have the option of no drag by adding a few watts into the system. 


Matt Foley 
Sunlight Conversions
Perpetual Energy, LLC
201-914-0466



On Saturday, January 9, 2021, 09:04:25 PM EST, Carsten via groups.io <carstensemail=yahoo.com@groups.io> wrote:


Michael, consider a big folding or feathering prop, which will give you far less drag.
Then find the proper ratio for engine rpm and prop rpm.

A toothbelt solution will give you the opportunity to change the ratio.


On Sunday, 10 January 2021, 04:29:08 GMT+8, Michael Blackstock <mdblackstock@gmail.com> wrote:


Thanks for your responses, all. I think I'm just going to go with another stock 2 blade to reduce drag under sail. I plan on utilizing the motor very infrequently, so more speed under sail sounds good to me. 
There are so many resources for Catalina owners, but I thought I would check with you all first. 
I will definitely be chiming back in when I begin my motor and battery install!
Thanks

Michael Blackstock

Cell phone 503-913-8217

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