You have a hull design and have given a number of 30 ? for max thrust the hull is designed for. What Prop Spec will give you the largest most aggressive Prop design to produce the 30 "whatevers" of Thrust ? When you know that, configure a Propulsion System that will produce 6 knots for 8 hrs using the most aggressive slow turning Prop Design, I would suggest 10 hrs. Build a 15 % conservative factor into the Design if your at Sea or a large Lake.
As always , there is a Budget, where Up Front Costs outweigh the Long Term Benefits, just for ballpark idea, a decent Hybrid Solution to meet the Intent would be @ 15K usd, +/- 50% depending on a few key factors. How much Time do you plan to spend on the Tug ?
Apologize if I missed anything in previous trails, Time is Money, how simple is that, right? Little Time on Board = Little Investment and so forth, given that, is it worth putting 15k usd and your Time into a well designed Hybrid marine Propulsion System?
From: 'Dan Hennis' dhennis@centurytel.net [electricboats] <electricboats@yahoogroups.com>
To: electricboats <electricboats@yahoogroups.com>
Sent: Thu, May 29, 2014 7:24 pm
Subject: Re: [Electric Boats] 50 HP diesel VS electric
On May 28, 2014, at 8:41 AM, "'Dan Hennis' dhennis@centurytel.net [electricboats]" <electricboats@yahoogroups.com> wrote:
For a sailboat 1000 watts per ton of displacement. 2000 watts per ton for a power boat.
On May 28, 2014, at 12:40 AM, "Hannu Venermo gcode.fi@gmail.com [electricboats]" <electricboats@yahoogroups.com> wrote:
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)
Checked by AVG - www.avg.com
Version: 2014.0.4592 / Virus Database: 3950/7573 - Release Date: 05/27/14
Dan Hennis
;-)>
Checked by AVG - www.avg.com
Version: 2014.0.4592 / Virus Database: 3950/7580 - Release Date: 05/28/14
Dan Hennis
;-)>
Posted by: GNHBus@aol.com
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