[Public-List] Public-List Digest, Vol 3994, Issue 1

[Kris Coward]

As a note, by making my own electric motor (they're actually
comparatively simple -- though use of a milling machine and drill press
are kinda necessary for some fabrication operations), I kept my
conversion costs down around C$3k (including the batteries, the actual
motor, the controller, the cables and switches, shafting, bearings,
belts, pulleys, and other hardware).

I wrote up the project as a series of blog posts (the 4th post on
connecting the existing A4 engine controls to the electric motor's
control system, hasn't been written yet, as I've still been fiddling
around with that bit), which you can find at:

https://kiwano.melon.org/?p=1511
https://kiwano.melon.org/?p=1513
https://kiwano.melon.org/?p=1531

...though after seeing these RPM numbers, I'm now wondering whether I
should adjust my pulley sizes a little...

Cheers,
Kris

On Wed, Apr 22, 2020 at 08:12:52PM +0000, Daniel Swords via Public-List wrote:
> I recorded this quite some time ago. I have a 28 hp Yanmar and the original two blade prop which I think is a 13/8. I tried a three blade prop for a short while but I much prefer the two blade. I am jealous of your electric motor!  It would suit my sailing requirements perfectly, except for the initial conversion costs. 
>             RPM/knots:         - 2600/5.3         -2800/5.5         -3000/5.8         - 3600/6.3
> Sent from Yahoo Mail for iPhone
> 
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> Today's Topics:
> 
>   1. Optimal prop RPM for hull speed. (David A. Bardsley)
>   2. Fwd: Alberg 30#412 for sold.  Thanks Eric (Eric Ertley)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 22 Apr 2020 15:40:39 -0300
> From: "David A. Bardsley" <davebardsley at eastlink.ca>
> To: public-list at lists.alberg30.org
> Subject: [Public-List] Optimal prop RPM for hull speed.
> Message-ID: <1045c97c-07dc-48ef-9658-de22eb6b8495 at email.android.com>
> Content-Type: text/plain; charset="utf-8"
> 
>   I'm closing in on Ginseng's electric repowering project design and am
>   looking for input on prop RPM needed to reach hull speed.  This data
>   will assist  me in specifying the optimal motor speed reduction ratio.
>   My prop is a two bladed type marked "13 8" that I imagine is fairly
>   common on our craft from Whitby.
>   Any data or advice you are willing to share would be greatly valued.
>   Dave
>   Ginseng #574
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Wed, 22 Apr 2020 15:26:03 -0400
> From: Eric Ertley <ertleye at gmail.com>
> To: public-list at lists.alberg30.org
> Subject: [Public-List] Fwd: Alberg 30#412 for sold.  Thanks Eric
> Message-ID: <96A7C610-9B6A-4228-881C-BC73DEB7A070 at gmail.com>
> Content-Type: text/plain;    charset=utf-8
> 
> 
> 
> Sent from my iPhone
> 
> Begin forwarded message:
> 
> > From: Eric Ertley <ertleye at gmail.com>
> > Date: March 5, 2020 at 1:18:28 PM EST
> > To: public-list at lists.alberg30.org
> > Subject: Alberg 30#412 for sale
> > 
> > ?Priced to sell $10,500.  Low hour Kubota ( 73hrs), B&G Vulcan 9, crisp mainsail from Bacon sails. Also condo slip at Flag Harbor Yacht Haven (slip 120) $7500 30?.
> > Eric Ertley
> > 443 975 2042
> > Ertleye at gmail.com
> > 
> > Sent from my iPhone
> 
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-- 
Kris Coward					http://unripe.melon.org/
GPG Fingerprint: 2BF3 957D 310A FEEC 4733  830E 21A4 05C7 1FEB 12B3