Thursday, April 27, 2017

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

 

Bob,
Sorry to address you as Jon. Another thing to consider is that due to the very limited space between the motor sprocket and your mounting plate (only about 5/8" on my system), there is little room for a bushing, let alone a bearing and housing between the big sprocket and plate. My system runs great though with only the flanged bearing on the aft side of the plate. 

Chris

Sent from myPhone

On Apr 27, 2017, at 15:00, bob jennings sabre281@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:

 

Thanks for mentioning the flanged bearing issue Chris. If someone uses a flanged bearing or a couple of pillow blocks, you need two to keep everything running true.
If one only wanted to use a single bearing for thrust protection on a belt reduction system, a trailer hub that a wheel bolts up to would work pretty slick. They're pretty cheap, $35 or so. I believe you'd have to use a couple of shaft collars to keep the shaft in place.

Bob

--------------------------------------------
On Wed, 4/26/17, Chris Hudson clh5_98@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, 6:41 PM


 









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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