Thursday, April 27, 2017

Re: [Electric Boats] Re: Beneteau First 26 electric conversion

 

Thanks Scott, that's very kind of you.

Water line- 23'
Beam- 9'
Hull draft excluding keel- 2'
Displacement-8000 lbs
1980 Sabre 28
sweet spot 3.5 - 3.7 knots
48 volt system

Although the boat has a hull speed of 6.4 knots based upon some preliminary calcs I've run using prop equation, 10" pitch allowing for 50% slippage.
At 1200 prop shaft rpm- 5.6 knots
At 800 prop shaft rpm-3.7 knots
Of course this is calm water.

If I run at 1.5-1 ratio to hit the sweet spot, 40 amps+-, a 2-1 ratio would be 60 amps +-

it will be interesting to see what you come up with.

Thanks,
Bob

--------------------------------------------
On Wed, 4/26/17, Scott Masterson smasterson2@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:

Subject: Re: [Electric Boats] Re: Beneteau First 26 electric conversion
To: electricboats@yahoogroups.com
Date: Wednesday, April 26, 2017, 6:57 PM


 









Bob,
I would like to help you with
calculating the gear ratio for the reduction. I could also
provide other valuable information too. To do this, I need
some additional information.
Please reply with the
following:1.) Waterline length of vessel in Feet

2.) Beam at the waterline in Feet
3.) Molded hull draft (excluding keel) in Feet

4.) Vessel displacement weight in Pounds 

5.) Number of engines (Shaft lines)    

6.) Desired maximum speed
7.) Desired cruise speed
(efficiency)8.) Vessel year, make and
model
Scott
On Wed, Apr 26, 2017 at
4:55 PM, bob jennings sabre281@yahoo.com
[electricboats] <electricboats@yahoogroups.com>
wrote:


























 













Jon,



Yes I'm planning on gear reduction but will be
expermenting with the ratios. It's another part of the
reason for building my own mounting system, to make changing
the driven sheeve easy. I plan to start out at 1.5-1, bought
the clearview display in order to monitor motor/controller
temperature & will teak the ratio from there as
required. For thrust bearings, not sure yet but I've
been looking at 4 bolt composite flanged bearings. I want to
be sure the driven shaft portion of the assembly is
electrically isolated from the mount & drive. The
Thunderstuck gear reduction isn't a bad deal for the
money, I just wanted to do something different. It's a
personality flaw, never have stayed between lines :)



Bob



------------------------------ --------------

On Wed, 4/26/17, iwpdjxgov7lev62jza5wvrs5rzz3l2
nbgbqc7oft@yahoo.com [electricboats] <electricboats@yahoogroups.com
> wrote:



Subject: Re: [Electric Boats] Re: Beneteau First 26 electric
conversion

To: electricboats@yahoogroups.com

Date: Wednesday, April 26, 2017, 11:26 AM





 



















@Bob: Did you plan for a reduction gear and

thrust-bearing of your own design as well then? I fully

agree the mounting options with the single plate looks
less

than ideal, but I assume it works considering people are

using it like that.

As

for the folding VS regen I am still curious if I can
achieve

both using my Gori folding prop, based on this statement

from Oceanvolt. https://www.ab-
marine.com/2015/11/18/gori- selected-as-the-factory-
supplied-propeller-for- oceanvolt/ If

it works I'll be happy, if it don't work
I'll

figure something else out.

@Mark I don't live close to

Grimstad unfortunately, but if you are documenting your

installation I'd be happy if you share it

online.

/Jon



















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