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

[Andrew Johns]

Hi Kris

We have a Westerbeke 18 diesel , with a 2:1 ratio gearbox  and a 13x10 3
blade prop.  (Michigan Wheel MP 3)

2500 rpm - 4.8 kts
2700 rpm - 5.2 kts
3000 rpm - 5.8 kts
3200 rpm - 6.2 kts (full throttle)


On Wed, Apr 22, 2020 at 10:06 PM Kris Coward via Public-List <
public-list at lists.alberg30.org> wrote:

>
> 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
> >
> >
> > On Wednesday, April 22, 2020, 3:05 PM,
> public-list-request at lists.alberg30.org wrote:
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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
> >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
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> > ------------------------------
> >
> > End of Public-List Digest, Vol 3994, Issue 1
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> >
> >
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> --
> Kris Coward                                     http://unripe.melon.org/
> GPG Fingerprint: 2BF3 957D 310A FEEC 4733  830E 21A4 05C7 1FEB 12B3
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