Wednesday, May 28, 2014

Re: [Electric Boats] 50 HP diesel VS electric

 

That would be 2.4 tons. And a motor boat so the minimum continuous HP should be at least 6.4 or rounded up 7HP.  

On May 28, 2014, at 8:41 AM, "'Dan Hennis' dhennis@centurytel.net [electricboats]" <electricboats@yahoogroups.com> wrote:

 



I am planning to start my build soon, and it is a 4800# tug that recommends 10-30 HP.
Dan
 
----- Original Message -----
Sent: Wednesday, May 28, 2014 12:45 AM
Subject: Re: [Electric Boats] 50 HP diesel VS electric

 


For a sailboat 1000 watts per ton of displacement.   2000 watts per ton for a power boat.

My boat has a 13 ton displacement and is a powerboat so I should have around 26 continuous HP.




On May 28, 2014, at 12:40 AM, "Hannu Venermo gcode.fi@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:

 

You probably need about 1/3, or about 17 Hp from a continuous duty
electric drive.

If you could put a prop 2 sizes larger on it, you would also get it to
be more efficient, and have a lot more thrust.

Historically, ICE solutions are pretty inefficient.
So, they just spin the prop faster, loosing efficiency, while increasing
thrust.
Efficiency has not been an important factor in ICE boats, in the past.

Neither is it today, as a matter of fact.
Buyers want large, round, bathtub shaped hulls, and as much "space" and
glitter and "brand-name" yachty stuff as possible.
Succesful boatbuilders deliver what the customers want to buy.

Fwiw, 100 Hp in ICE, is far more than needed for a 24 m, 70 metric tons,
full displacement steel yacht a friend has.
He cannot be bothered to pay for a better prop (expensive), as a single
tank of diesel lasts all summer.

That boat uses about 20-30% of max power (but its lakes).
Maybe 30 days overnight use per summer, with 2 rooms and a sauna.

On 27/05/2014 23:06, 'Dan Hennis' dhennis@centurytel.net [electricboats]
wrote:
> I am looking in DIY,
> and if I install an electric motor I'd rather have a motor for all
> situations right away(coastal and blue water)
> what I dont know is what size electric motor would do the same job as
> my 50 hp diesel?
>
> Martin

--
-hanermo (cnc designs)

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Respectfully,
Dan Hennis
;-)>

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