[Public-List] Public-List Digest, Vol 4062, Issue 1
Andrew Johns
johnsab9 at gmail.com
Thu Aug 20 09:27:14 PDT 2020
Don,
I think the Yanmar has a reduction transmission, vs the A4 direct drive
one. The output on the transmission spins opposite of the crankshaft
rotation. Our Westerbeke is the same way.
On the subject of free wheeling props we alway put ours in reverse to stop
the rotation. But I understand that is not recommended with some
transmissions.
- Andrew
On Thu, Aug 20, 2020 at 12:03 PM Michael Connolly via Public-List <
public-list at lists.alberg30.org> wrote:
> Hummmmm Interesting. Maybe Daniel Swords can elaborate on his comments.
> Don, would the prop work at all if turned in the reverse direction?
> Michael
> > On 08/20/2020 9:16 AM Don Campbell via Public-List <
> public-list at lists.alberg30.org> wrote:
> >
> >
> > There is something fishy with this description because an A4 is a
> > clockwise rotation and the Yanmar is counterclockwise , so the props
> > should have different rotations on them.
> > Don
> >
> > ------ Original Message ------
> > From: "Daniel Swords via Public-List" <public-list at lists.alberg30.org>
> > To: public-list at lists.alberg30.org
> > Cc: "Daniel Swords" <danielswords at yahoo.com>
> > Sent: 2020-08-19 6:22:11 PM
> > Subject: Re: [Public-List] Public-List Digest, Vol 4062, Issue 1
> >
> > >I have a Yanmar 3YM20 with the original Atomic 4 two blade propeller.
> The PO had switched to a three blade propeller but I hated it so much that
> I paid to have the boat hauled out just to replace the three blade
> propeller with the original two blade. The three blade spun continuously
> even at very low sailing speeds if left in neutral as Yanmar recommends
> (the spinning was noisy and caused the tiller to shake), and if left in
> gear it would be nearly impossible to shift back into neutral to start the
> engine if the boat had any forward momentum at all. The two blade seems to
> park itself behind the keel (at least I never notice it spinning) and I am
> very pleased with the performance.
> > >
> > >
> > >Sent from Yahoo Mail for iPhone
> > >
> > >
> > >On Wednesday, August 19, 2020, 3:05 PM,
> public-list-request at lists.alberg30.org wrote:
> > >
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> > >Please do NOT include the entire digest in your reply!
> > >======================================================
> > >
> > >
> > >
> > >Today's Topics:
> > >
> > > 1. Props and Fuel Returns. (charles pleisse)
> > > 2. Re: Props and Fuel Returns. (Andrew Johns)
> > > 3. Re: Props and Fuel Returns. (Michael Grosh)
> > >
> > >
> > >----------------------------------------------------------------------
> > >
> > >Message: 1
> > >Date: Wed, 19 Aug 2020 10:40:01 -0400
> > >From: charles pleisse <velocharles1 at gmail.com>
> > >To: public-list at lists.alberg30.org
> > >Subject: [Public-List] Props and Fuel Returns.
> > >Message-ID:
> > > <
> CAGwh+2SKjYZXmmK7xoQF6LjKR1_0xaXs+J-VzhMFeW9zALZ1og at mail.gmail.com>
> > >Content-Type: text/plain; charset="UTF-8"
> > >
> > >I have recently acquired a diesel to replace my atomic 4 and I am
> curious
> > >about the various propeller sizes being used with diesels in Alberg
> 30s. I
> > >am keen to hear feedback on propeller performance from those of you
> using 2
> > >blade propellers with a diesel. Along with your impressions of
> performance,
> > >It would be useful to know what engine you have, (maker and HP) and the
> > >pitch and diameter of your two blade propellers. There is a lot of
> help on
> > >line sizing propellers but nothing beats direct feedback on performance.
> > >Another concern with this repower is the fuel return. Since the
> existing
> > >engine is gas powered, there is currently no return. Nor is there any
> > >additional fixture on the tank to accommodate one. I was thinking it
> might
> > >work well to "T" it on the vent line nearest where it exits the tank.
> As a
> > >footnote, the vent opening is quite high inside the nearest stanchion.
> > >
> > >Charles Pleisse
> > >College Park Bicycles
> > >( <http://www.bike123.com>301)864-2211
> > >
> > >
> > >------------------------------
> > >
> > >Message: 2
> > >Date: Wed, 19 Aug 2020 11:15:34 -0400
> > >From: Andrew Johns <johnsab9 at gmail.com>
> > >To: Alberg 30 Public List -- open to all
> > > <public-list at lists.alberg30.org>
> > >Cc: charles pleisse <velocharles1 at gmail.com>
> > >Subject: Re: [Public-List] Props and Fuel Returns.
> > >Message-ID:
> > > <
> CAM5xwU7f_-9pkbkx7r-SFV55YkQC7+Eqns4+bT7OjQsJGZnsrQ at mail.gmail.com>
> > >Content-Type: text/plain; charset="UTF-8"
> > >
> > >Our return is "T" ed into the vent line at the tank with no issues.
> > >
> > >We have a fixed 3 blade 12X10 DJ355 Michigan Wheel prop. Freshly
> rebuilt
> > >18hp Westerbeke with a 2.05 ratio.
> > >
> > >On flat water max speed is 6.4 kts at 3200rpm (engine is governed to
> 3400).
> > >
> > >Typical cruise is 5.5 kts at 2500 we average around 1/2 gal per hour.
> > >
> > >Overall we are happy with the setup, I could probably go with a little
> more
> > >pitch and drop the RPMs at cruise a bit, but I would lose the extra
> power
> > >on the top end.
> > >
> > >- Andrew
> > >ECOLA #104
> > >Lake Champlain, VT (headed to the Chesapeake next week)
> > >
> > >
> > >On Wed, Aug 19, 2020 at 10:50 AM charles pleisse via Public-List <
> > >public-list at lists.alberg30.org> wrote:
> > >
> > >> I have recently acquired a diesel to replace my atomic 4 and I am
> curious
> > >> about the various propeller sizes being used with diesels in Alberg
> 30s. I
> > >> am keen to hear feedback on propeller performance from those of you
> using 2
> > >> blade propellers with a diesel. Along with your impressions of
> performance,
> > >> It would be useful to know what engine you have, (maker and HP) and
> the
> > >> pitch and diameter of your two blade propellers. There is a lot of
> help on
> > >> line sizing propellers but nothing beats direct feedback on
> performance.
> > >> Another concern with this repower is the fuel return. Since the
> existing
> > >> engine is gas powered, there is currently no return. Nor is there
> any
> > >> additional fixture on the tank to accommodate one. I was thinking
> it might
> > >> work well to "T" it on the vent line nearest where it exits the
> tank. As a
> > >> footnote, the vent opening is quite high inside the nearest
> stanchion.
> > >>
> > >> Charles Pleisse
> > >> College Park Bicycles
> > >> ( <http://www.bike123.com>301)864-2211
> > >> _______________________________________________
> > >> These businesses support your Association:
> > >>http://www.alberg30.org/store/A30supporters.html
> > >> Please support them.
> > >> _______________________________________________
> > >> Public-List mailing list
> > >>Public-List at lists.alberg30.org
> > >>http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >>
> > >
> > >
> > >------------------------------
> > >
> > >Message: 3
> > >Date: Wed, 19 Aug 2020 14:10:41 -0400
> > >From: Michael Grosh <dickdurk at gmail.com>
> > >To: Alberg 30 Public List -- open to all
> > > <public-list at lists.alberg30.org>
> > >Subject: Re: [Public-List] Props and Fuel Returns.
> > >Message-ID:
> > > <
> CAO99GuFfag01G6s6bppVoFFjthg8KUjkAdqJq2Bshct6wfByTQ at mail.gmail.com>
> > >Content-Type: text/plain; charset="UTF-8"
> > >
> > >Checkmate has a 15 hp. diesel with 2:1 reduction gear. Swinging a 13 X
> 12
> > >2 blade, it all seems well matched. I don't have a tach, it seems like a
> > >fast idle drives the boat about 5 1/4 knots. Full ahead in calm water
> gives
> > >over 7 kts. but engine definately laboring at that power. Black exhaust
> and
> > >water discharge gets hot quickly.
> > >Michael G
> > >
> > >On Wed, Aug 19, 2020, 12:00 charles pleisse via Public-List <
> > >public-list at lists.alberg30.org> wrote:
> > >
> > >> I have recently acquired a diesel to replace my atomic 4 and I am
> curious
> > >> about the various propeller sizes being used with diesels in Alberg
> 30s. I
> > >> am keen to hear feedback on propeller performance from those of you
> using 2
> > >> blade propellers with a diesel. Along with your impressions of
> performance,
> > >> It would be useful to know what engine you have, (maker and HP) and
> the
> > >> pitch and diameter of your two blade propellers. There is a lot of
> help on
> > >> line sizing propellers but nothing beats direct feedback on
> performance.
> > >> Another concern with this repower is the fuel return. Since the
> existing
> > >> engine is gas powered, there is currently no return. Nor is there
> any
> > >> additional fixture on the tank to accommodate one. I was thinking
> it might
> > >> work well to "T" it on the vent line nearest where it exits the
> tank. As a
> > >> footnote, the vent opening is quite high inside the nearest
> stanchion.
> > >>
> > >> Charles Pleisse
> > >> College Park Bicycles
> > >> ( <http://www.bike123.com>301)864-2211
> > >> _______________________________________________
> > >> These businesses support your Association:
> > >>http://www.alberg30.org/store/A30supporters.html
> > >> Please support them.
> > >> _______________________________________________
> > >> Public-List mailing list
> > >>Public-List at lists.alberg30.org
> > >>http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >>
> > >
> > >
> > >------------------------------
> > >
> > >Subject: Digest Footer
> > >
> > >_______________________________________________
> > >These businesses support your Association:
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> > >Please support them.
> > >_______________________________________________
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> > >Public-List at lists.alberg30.org
> > >http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> > >
> > >
> > >------------------------------
> > >
> > >End of Public-List Digest, Vol 4062, Issue 1
> > >********************************************
> > >
> > >
> > >
> > >_______________________________________________
> > >These businesses support your Association:
> > >http://www.alberg30.org/store/A30supporters.html
> > >Please support them.
> > >_______________________________________________
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> >
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> > _______________________________________________
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> > http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
> _______________________________________________
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> Please support them.
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