Friday, May 29, 2009

Re: [Electric Boats] RE: Electric power for over 30' [Question for Dave K]



Hey Tom,
 
I am running a 14 inch 13 pitch 3 blade prop inside a Rice Power/Speed nozzle, this gives me the most effecient use, my friend with the 50 hp diesel is running a 13 inch 8 pitch open 3 blade prop...........
 
First I would never hook the 2 boats stern to stern for a pulloff, that to me is just BS.  Both tests were made with the same 550 lb. pull scale.   At 3000 rpm's he had slightly more pull than my electric but he never runs his diesel at that rpm.    At 100 amps I was reading just a little over 300 lb pull.  At the 3000 rpm's diesel he was about 20 lbs pull over the electric..
 
That's the no BS account.....   believe it or not is your choice...
 
Dave K   (my real name)
 
 
 
 
-- On Wed, 5/27/09, iloveamercedes@aol.com <iloveamercedes@aol.com> wrote:

From: iloveamercedes@aol.com <iloveamercedes@aol.com>
Subject: [Electric Boats] RE: Electric power for over 30' [Question for Dave K]
To: electricboats@yahoogroups.com
Date: Wednesday, May 27, 2009, 3:38 PM

Hey Dave, I am  intrigued at the prospect that a rated 8 hp electric motor
can have the same  pulling power as a 'rated' 50 hp Diesel motor!
Now I may not  understand what "Bollard Pull" is... but I do understand
that there are a few  things people s-t-r-e-t-c-h the truth about: One of them
is about Gas Mileage  and evidently the other one is the power electric
motors produce. lol. Ok  Dave, I'm only kidding but please help me to understand
how this can happen? I  mean 'Efficiency' can only do so much!
Is this '300 lb Bollard  pull' at startup, full speed or someplace in
between and if this is true, why am  I looking at a bigger motor? A 300 pound
pull is a lot of  pull/push...whatever.

  So let me  recap:
If you took a 20'  line and hooked your sailboat (8 hp) to your friends
sailboat (50 hp) Stern to  Stern and you both opened throttle; Nothing would
move until either you ran out  of electricity or your friends sailboat ran
out of Diesel.
-Tom- (not my real  name)

In a message dated 5/27/2009 11:08:35 A.M. Eastern Daylight Time, 
inganear1@yahoo.com writes:

Tom, there are several projects completed and many underway in 
approximately your size range.  48 volt systems seem to be the normal  voltage for most
but some run on 36 volts.  Look through the photo  section, you'll find
several to draw ideas from.  There are several guys  one the site that are
building a business out of electric conversions making  kits/pods and other
things that may be of interest to you.   My boat  is a 30 ft ChrisCraft Capri
sailboat that weighs in at 12000 lbs.    I use a Etek brushed motor 8 hp and
have the same bollard pull as a friend of  mine on his 50 hp diesel, (a
little over 300lbs), so you see it's not just  rated Hp that does the job, it's
also efficiency..

Dave  K

--- On Tue, 5/26/09, Tom <_iloveamercedes@iloveam_
(mailto:iloveamercedes@aol.com) >  wrote:

From: Tom <_iloveamercedes@iloveam_ (mailto:iloveamercedes@aol.com) >
Subject:  [Electric Boats] RE: Electric power for over 30'
To: _electricboats@electricboatele_ (mailto:electricboats@yahoogroups.com)
Date:  Tuesday, May 26, 2009, 8:15 PM

Hello everyone!
I know  there must be a thread for powering sailboats over 30' with
electric motors.  Can someone direct me to it?
My sailboat is a Cal 35 Cruising. She is of  15,000 lbs. Displacement.
I think this project would need around 35 hp. She  has a 4-108 Perkins of
'Claimed' 50HP hahahaha!
Anyway, with what little I  know about this, I would need a bank of about 5
Golf Cart Batteries.
I  also want to utilize Solar Panels as well as a Gas Power Generator.
So let  me know how screwed up my ideas are so I can get an idea of where
to start  here.
Thanks

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