[electricboats] Practical Boat Owner article about our first hop

Hello, all! A flood tide raises all boats, so I hope you'll be glad to see this link to the article PBO commissioned from us after we did our conversion and got as far as the Azores from the US.

https://www.pbo.co.uk/cruising/electric-cruising-yacht-to-the-azores-84074

We're on a Baba 30 sailboat and went with an Electric Yacht QuietTorque 10.0, so a lot of folks on this site won't need our technical data motor-wise. We made our own LiFePO4 pack with Eve cells and a JK BMS. If you're interested in our figures and findings and installation process, etc, etc, most of our Patreon posts aren't paywalled and there's an option to be a "free member" so that you can see the info without paying. We'd love the support, of course, but we don't want to slow the spread of information about going electric. S/V SN-E Cetacea's Patreon Page

And, of course, I'm happy to talk about any of that here too!

Posting this link on various Facebook groups got me in some less-than-good-faith arguments that have me a little raw. I don't expect you-all to have that kind of desire to tear someone down. If you come at me in a way that feels disrespectful, I'll try to hold onto my patience but I'm afraid it's starting to wear thin. Thanks in advance for kind critique and/or open questioning.

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Re: [electricboats] long-tail boats

John, Great thought with a notion to "mount the motor with a belt drive to
the propeller shaft, so you can relatively cheaply adjust the "gear"
ratio to match the propeller for best efficiency and performance."

I look forward to reading more on this tread.

On Thu, Feb 29, 2024 at 2:59 AM John Kohnen <jkohnen@boat-links.com> wrote:

Where are you located, Mogjib? I assume you want to replace the gas
engine of an existing longtail setup with an electric motor, on a boat
type common in your locality. Many such boats are long, narrow and
canoe-like, and can be pushed very easily to decent speeds. Great
candidates for electric power. :o) As long as "decent speed" is fast
enough for you. <g> A friend of mine is planning to experiment with
electric power on a proa he built decades ago, though it will probably
end up with two outriggers and become more of a bangka...

As someone interested in the kinds of boats developed in different parts
of the world I'm looking forward to seeing the boat you want to convert,
and I'm sure interested in following your project.

My 2¢ worth of advice is to try to mount the motor with a belt drive to
the propeller shaft, so you can relatively cheaply adjust the "gear"
ratio to match the propeller for best efficiency and performance.
Mounting the electric motor directly to the propeller shaft, like the
gas motor, would be much simpler, but you'd have to try different
propellers until you find the one that works best. Though there are
calculations to help find a suitable propeller there still seems to be
some magic involved. ;o)

On 2/27/2024 10:20 PM, Mogjib Salek wrote:
> 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
> <mailto: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

--
John <jkohnen@boat-links.com>
School days, I believe, are the unhappiest in the whole span of human
existence. They are full of dull, unintelligible tasks, new and
unpleasant ordinances, brutal violations of common sense and common
decency. (H. L. Mencken)

_._,_._,_

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Re: [electricboats] long-tail boats

Where are you located, Mogjib? I assume you want to replace the gas
engine of an existing longtail setup with an electric motor, on a boat
type common in your locality. Many such boats are long, narrow and
canoe-like, and can be pushed very easily to decent speeds. Great
candidates for electric power. :o) As long as "decent speed" is fast
enough for you. <g> A friend of mine is planning to experiment with
electric power on a proa he built decades ago, though it will probably
end up with two outriggers and become more of a bangka...

As someone interested in the kinds of boats developed in different parts
of the world I'm looking forward to seeing the boat you want to convert,
and I'm sure interested in following your project.

My 2¢ worth of advice is to try to mount the motor with a belt drive to
the propeller shaft, so you can relatively cheaply adjust the "gear"
ratio to match the propeller for best efficiency and performance.
Mounting the electric motor directly to the propeller shaft, like the
gas motor, would be much simpler, but you'd have to try different
propellers until you find the one that works best. Though there are
calculations to help find a suitable propeller there still seems to be
some magic involved. ;o)

On 2/27/2024 10:20 PM, Mogjib Salek wrote:
> 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
> <mailto: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

--
John <jkohnen@boat-links.com>
School days, I believe, are the unhappiest in the whole span of human
existence. They are full of dull, unintelligible tasks, new and
unpleasant ordinances, brutal violations of common sense and common
decency. (H. L. Mencken)



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Re: [electricboats] long-tail boats

There are a lot of variables. Do you know how fast and how far you need it to go? This will determine your design.

If you want to go 4-5 knots for an hour or two, then a small electric outboard and small battery will work.

If you want to go 15-20 knots, then you are talking about a much bigger battery, which is most of the cost. This will also affect your boat design, due to the size and weight of the battery.

Any reason why you want to use a longtail design? The main benefit of longtails are they are good in shallow water, and can be beached.

This forum can definitely help, but I think you should let us know what your requirements are, and what body of water you are going to use it on. Do you have the boat already?

On Wed, Feb 28, 2024 at 1:20 AM Mogjib Salek <mogjibs@gmail.com> wrote:

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

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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You receive all messages sent to this group.

View/Reply Online (#32575) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
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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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You receive all messages sent to this group.

View/Reply Online (#32574) | Reply To Group | Reply To Sender | Mute This Topic | New Topic
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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