[Public-List] Public-List Digest, Vol 4062, Issue 1
Michael
dickdurk at gmail.com
Thu Aug 20 14:37:12 PDT 2020
My 2 QM15 Yanmar uses a right hand wheel(clockwise). The issue I have
with the description is Yanmar's recommendation to keep the trans in
neutral under sail. I have not seen that. Larger gears (Twin Disc on
Tugs specifically) do not want the wheels spinning without the main
engine running. It's a pressurized lubrication issue.
Paint a stripe on the shaft where the (2 bladed) prop is vertical and
jam the shifter in FWD and sailing is optimized with no wear on gear
bearings.
3 blade wheels are not possible to shield behind deadwood, but stopping
their spin I would think is still desirable.
Also, it seems to me by putting the gear in reverse when under sail
means the hydraulic pressure encourages the engine to run backwards.
Michael G
#220
------ Original Message ------
From: "Andrew Johns via Public-List" <public-list at lists.alberg30.org>
To: "Alberg 30 Public List -- open to all"
<public-list at lists.alberg30.org>
Cc: "Andrew Johns" <johnsab9 at gmail.com>
Sent: 8/20/2020 12:27:14 PM
Subject: Re: [Public-List] Public-List Digest, Vol 4062, Issue 1
>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:
>> > >
>> > >Send Public-List mailing list submissions to
>> > > public-list at lists.alberg30.org
>> > >
>> > >To subscribe or unsubscribe via the World Wide Web, visit
>> > > http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
>> > >or, via email, send a message with subject or body 'help' to
>> > > public-list-request at lists.alberg30.org
>> > >
>> > >You can reach the person managing the list at
>> > > public-list-owner at lists.alberg30.org
>> > >
>> > >When replying, please edit your Subject line so it is more specific
>> > >than "Re: Contents of Public-List digest..."
>> > >
>> > >
>> > >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:
>> > >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
>> > >
>> > >
>> > >------------------------------
>> > >
>> > >End of Public-List Digest, Vol 4062, Issue 1
>> > >********************************************
>> > >
>> > >
>> > >
>> > >_______________________________________________
>> > >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
>> >
>> > _______________________________________________
>> > 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
>> _______________________________________________
>> 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
>>
>_______________________________________________
>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
More information about the Public-List
mailing list