Re: [electricboats] long-tail boats

Hi Kev,

How long would be a « short ride »? I need also a cost estimate! Any tip?

Thank you all for your help!!

On Wed 28 Feb 2024 at 01:13, Kev <captainyoung@gmail.com> wrote:

If I understand correctly, you want to use the design of long tail boats like this, but you want to switch from a gas engine to an electric motor:

https://www.mdpi.com/wevj/wevj-12-00036/article_deploy/html/images/wevj-12-00036-g001.png

If you want the same performance, you want to go with around 1/3 the rated hp of the gas motor. So for example, if you had a 20 hp gas motor you would want to have around a 6 hp electric motor, which is about 5KW electric motor.

The problem you will have, is that you will need a very large battery bank, unless you are only going on short rides. It is possible though.

On Tue, Feb 27, 2024 at 4:39 PM Phil Boyer via groups.io <philaboyer=yahoo.ca@groups.io> wrote:

Hi, 
Sounds like you have a sail boat and you need to have an extra long shaft to reach below the water. All motors  are standard long shaft or short shaft. Or you can buy a pod type that mounts under your boat. You may need to design a mount that can extend down when you wish to motor. If you have a picture you could send  I would have a better idea. Or post it on the Facebook page and ask for ideas.

Regards

Phil

On Tuesday, February 27, 2024 at 02:00:50 p.m. EST, mogjibs@gmail.com <mogjibs@gmail.com> wrote:

Hi,

I was wondering what would be the best electric motor for "long-tail boats" (in replacement for gasoline, diesel etc. motors; these are outboard motors altered to extend their propellers far from the rest of the motor)!

Thank you in advance for your comments, suggestions and tips.

Best,
M

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Re: [electricboats] long-tail boats

If I understand correctly, you want to use the design of long tail boats like this, but you want to switch from a gas engine to an electric motor:

https://www.mdpi.com/wevj/wevj-12-00036/article_deploy/html/images/wevj-12-00036-g001.png

If you want the same performance, you want to go with around 1/3 the rated hp of the gas motor. So for example, if you had a 20 hp gas motor you would want to have around a 6 hp electric motor, which is about 5KW electric motor.

The problem you will have, is that you will need a very large battery bank, unless you are only going on short rides. It is possible though.

On Tue, Feb 27, 2024 at 4:39 PM Phil Boyer via groups.io <philaboyer=yahoo.ca@groups.io> wrote:

Hi, 
Sounds like you have a sail boat and you need to have an extra long shaft to reach below the water. All motors  are standard long shaft or short shaft. Or you can buy a pod type that mounts under your boat. You may need to design a mount that can extend down when you wish to motor. If you have a picture you could send  I would have a better idea. Or post it on the Facebook page and ask for ideas.

Regards

Phil

On Tuesday, February 27, 2024 at 02:00:50 p.m. EST, mogjibs@gmail.com <mogjibs@gmail.com> wrote:

Hi,

I was wondering what would be the best electric motor for "long-tail boats" (in replacement for gasoline, diesel etc. motors; these are outboard motors altered to extend their propellers far from the rest of the motor)!

Thank you in advance for your comments, suggestions and tips.

Best,
M

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Re: [electricboats] long-tail boats

Hi, 
Sounds like you have a sail boat and you need to have an extra long shaft to reach below the water. All motors  are standard long shaft or short shaft. Or you can buy a pod type that mounts under your boat. You may need to design a mount that can extend down when you wish to motor. If you have a picture you could send  I would have a better idea. Or post it on the Facebook page and ask for ideas.

Regards

Phil

On Tuesday, February 27, 2024 at 02:00:50 p.m. EST, mogjibs@gmail.com <mogjibs@gmail.com> wrote:

Hi,

I was wondering what would be the best electric motor for "long-tail boats" (in replacement for gasoline, diesel etc. motors; these are outboard motors altered to extend their propellers far from the rest of the motor)!

Thank you in advance for your comments, suggestions and tips.

Best,
M

Re: [electricboats] long-tail boats

If it doesn't need to be lifted out of the water permanently mounted  a pod is the best solution. Even if it does does need to be lifted out a pod may still be the best solution can be attached to a jack/tilt plate and the shaft length is easily configurable. 

Matt Foley

Sunlight Conversions 

1-201-914-0466

sunlightconversions.com

instagram.com/sunlightconversions/

youtube/sunlightconversions

ABYC Certified Marine 

Electrical Technician

On Feb 27, 2024, at 2:00 PM, mogjibs@gmail.com wrote:

Hi,

I was wondering what would be the best electric motor for "long-tail boats" (in replacement for gasoline, diesel etc. motors; these are outboard motors altered to extend their propellers far from the rest of the motor)!

Thank you in advance for your comments, suggestions and tips.

Best,
M

[electricboats] long-tail boats

Hi,

I was wondering what would be the best electric motor for "long-tail boats" (in replacement for gasoline, diesel etc. motors; these are outboard motors altered to extend their propellers far from the rest of the motor)!

Thank you in advance for your comments, suggestions and tips.

Best,
M

_._,_._,_

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Re: [electricboats] Floating PV Hazard Potential?

This is only to charge batteries on a 19-foot, open, day-sailing type
sailboat. Mounting options for solar panels are limited and the possible
ones detract from the boat's form and function. This just becomes a
solar shore power in a sense. I do not want to wire the boat for typical
shore power chargers. This is in freshwater - no problems in use other
than the curious critters. Saltwater certainly could pose problems, but
maybe not a deal breaker.

There are large arrays in use and many more under development - mostly
in far east. Not much that I can find for small-scale. Here is MTU project:

https://www.pv-magazine.com/2020/11/09/open-source-method-to-build-flexible-floating-pv-systems/



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Re: [electricboats] Floating PV Hazard Potential?

Is this a test for using solar panels on floats to charge boats, or are you experimenting for large scale usage? Sorry I missed your original post.

For a boat, I would think it would be much better to put it on deck, or attach it via a mount to the dock. Having it close to the water would seem to cause many issues. Water, especially salt water is very corrosive, damage from flotsam or boat hitting it, having to move it in and out of the way, shading... I just don't see the benefit of floating it in the water.

Can you link to the Michigan Tech article?

Good luck

On Wed, Feb 21, 2024 at 2:33 PM Walter Pearson <pearson1854@comcast.net> wrote:

I expect it only a remote possibility, but if anyone has interest in DIY-level floatovoltaics, I will report after two seasons of experience with my battery charging system. To review: This is a 100-watt semi-flexible panel bonded to an exercise mat that floats next to my sailboat while in its marina slip. Control is via Victron Energy MPPT 75/15 Solar Controller to 2X100Ah AGMs. The solar panel is partially shaded by the floating pier in early morning. Latitude DD is 46.677 N.

The components have held up well and the batteries continue to be charged to float level – at least whenever I have observed the status later in the day. There is no evidence so far for any delamination or degradation of the panel. There is also no evidence of stray electrical potential. The closed-cell foam pad has proved surprisingly durable and even seems to have some resistance to algae deposits and cleans off at season's end better than most things left submerged. The charging duty decreased during the second season because I no longer use the AGMs for propulsion.  It becomes overkill for house needs, but the weight is equal to the lead ingot ballast that was removed, so they will stay for now.

Occasionally there can be flotsam that settles on top – as cpcanoesailor warned – but a good rain or a bit of hosing solves that easily. The main problems I faced were missed in the advice from this group. The floating panel just proved irresistible to critters. In the first season, a mallard gave a new meaning for poop deck. This duck was quite persistent and possessive. It paid little attention to the dogs on the dock or interested onlookers. Scaring it off with the hose was only a brief interruption to its sunning and defecating activities. Amazingly, even with a large deposit of duck poop, the panel kept producing.

For the second season, I fashioned a protective cover of bird netting. This successfully kept the ducks off, but late in the season, a (suspected) otter got curious and broke through the netting. I do not know whether it was the same otter or not, but I also found the rope that tethered the panel to the pier cleat to be severed on two occasions. This year, there will be new bird netting and a cut-resistant line.

I have queried the journalist who covered some of the efforts of students at Michigan Tech and the university to find out whether they ever progressed to field tests for their floating system. In the article, the students were performing tests in a swimming pool. I was curious about successful deterrents if my critter condition is common. No reply received. I would imagine this critter invasion could be a serious drawback to small or large arrays. 

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