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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@...
> <mailto:captainyoung@...>> 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:
>? ? ?

--
John <jkohnen@...>
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)