Wednesday, April 26, 2017

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

 

Jon,
I built my own reduction system and finding the right bearing(s) and incorporating them into your design is likely the most challenging part of the project. You may be aware, I wasn't, a 4 bolt flange bearing housing is designed for a bearing with a spherical outer race. These are considered self aligning as the bearing is allowed to align itself in the housing to other bearings along the shaft. With just one bearing, your system will not run true once you tension the belt. These housings also allow the bearing to be rolled out of the housing for replacement. You will need another bearing, or maybe a bushing opposite of the main bearing if you use a flanged bearing. I had the backside of my bearing housing machined to accept a spacer ring that holds the bearing from self aligning once it's installed on the motor plate. This is the only bearing at the reduction plate and I have a separate thrust bearing 3.5 feet aft with a CV joint in between. 1.5:1 sounds pretty low, but I don't know what voltage you are using. I believe you will need a wider ratio than what your existing diesel has to allow the motor to keep its RPM as high as possible at load to reduce heat and increase efficiency. Make sure your design gives you room to install a big enough lower sprocket without having to use a tiny motor sprocket which is harder on your motor bearings. What I'm saying is plan for the worst as far as lower sprocket size. Happy to share more as needed.

Best of luck,
Chris

Sent from myPhone

On Apr 26, 2017, at 16:55, 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, iwpdjxgov7lev62jza5wvrs5rzz3l2nbgbqc7oft@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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