[Public-List] Public-List Digest, Vol 3679, Issue 1
Marcelo D. Gentinetta
vanguard64 at cox.net
Tue Jul 17 05:10:13 PDT 2018
Gordon,
So if I understand your statement correctly, you are a fan of the 2 blade 13 X 8 original prop? This is what I presently have also but at times I have considered a smaller 3 blade prop to prevent “lugging” and low RPMs.
Marcelo #441
> On Jul 16, 2018, at 5:35 PM, Gordon Laco via Public-List <public-list at lists.alberg30.org> wrote:
>
> Well the prop and boat are clean as a whistle… and in heavy weather punching into a head sea or towing another heavier boat, we perform like a tug boat. The boat has loads of ‘grunt’.
>
> Fuel economy is superb… engine cooling is well inside the envelope… engine is quiet and smooth. For most of the past fifty years she had the factory supplied two bladed prop… that gave only 1300 rpm at open throttle… but the boat was a little faster… but noisier due to prop thump (not the engine of course)
>
> We had a prop with easier pitch that allowed the engine to get up to about 1900 wide open… fuel consumption when through the roof, and maneuvering power was much degraded.
>
> I used to teach all that about horsepower when I was on faculty at Georgian Colleges marine tech programme… but the bottom line of course is not how the boat should behave by prediction, rather how she performs in service.
>
> Gordon Laco
> www.gordonlaco.com
> #426 Surprise
>
>
>
>> On Jul 16, 2018, at 6:29 PM, Greenhouse, Matthew A. (GSFC-6650) via Public-List <public-list at lists.alberg30.org> wrote:
>>
>> Gordon — If you can’t turn 2000 rpm in gear, then you have the wrong prop or it is badly fouled with marine growth. At 1200 one develops only about 8 brake horsepower as opposed to 20 at 2000. That will hurt in bad weather. Also, if the engine is in tune and alignment, then it will be smooth and quiet at all speeds.
>>
>> Matt
>> Friendship 295
>>
>> Sent from my iPhone
>>
>>> On Jul 16, 2018, at 5:43 PM, "public-list-request at lists.alberg30.org" <public-list-request at lists.alberg30.org> wrote:
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>>> Today's Topics:
>>>
>>> 1. Alternators... (Gordon Laco)
>>> 2. Re: Alternators... (Anders Bro)
>>> 3. Re: Alternators... (Gordon Laco)
>>> 4. Re: Alternators... (Anders Bro)
>>> 5. Re: Alternators... (Gordon Laco)
>>> 6. Re: Alternators... (Anders Bro)
>>>
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Mon, 16 Jul 2018 16:39:01 -0400
>>> From: Gordon Laco <mainstay at csolve.net>
>>> To: Alberg 30 Public List -- open to all
>>> <public-list at lists.alberg30.org>
>>> Subject: [Public-List] Alternators...
>>> Message-ID: <9B9C07F2-237E-44EA-A798-7D5365F11AE5 at csolve.net>
>>> Content-Type: text/plain; charset=utf-8
>>>
>>> Hello friends?
>>>
>>> Do any of you have data on what the output curve of our Atomic IV?s alternators will put out at various RPM?s?
>>>
>>> I?m looking at Moyer?s modern alternators, and noticed that they give output figures for ?normal operating speed of 2000rpm?. Well even with the boosted rpm our Campbell prop allows, we still don?t get more than 1500 going flat out? we cruise quietly at 1200.
>>>
>>> I understand our factory supplied alternators are ?30 amp? but what is it really delivering at real operational rpms?
>>>
>>> I understand that at lower rpm?s the alternator isn?t ?excited? so delivers little amperage?But I don?t know what the critical rpm rate is to achieve excitement
>>>
>>> I don?t understand this whole subject as well as I?d like to.
>>>
>>> Gordon Laco
>>> #426 Surprise
>>>
>>>
>>>
>>>
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 2
>>> Date: Mon, 16 Jul 2018 16:53:40 -0400
>>> From: Anders Bro <abro.gtu at gmail.com>
>>> To: Alberg 30 Public List -- open to all
>>> <public-list at lists.alberg30.org>
>>> Subject: Re: [Public-List] Alternators...
>>> Message-ID:
>>> <CACEd84sxKZn0RiuosopbPPf4S13k4mjzzaLZ=ieJwcoC93ZjMQ at mail.gmail.com>
>>> Content-Type: text/plain; charset="UTF-8"
>>>
>>> Ya, but isn't that alternator rpm and not engine speed? Usually the pulleys
>>> are sized to have alternator rpm higher than engine rpm.
>>> Anders
>>>
>>> On Jul 16, 2018 4:39 PM, "Gordon Laco via Public-List" <
>>> public-list at lists.alberg30.org> wrote:
>>>
>>> Hello friends?
>>>
>>> Do any of you have data on what the output curve of our Atomic IV?s
>>> alternators will put out at various RPM?s?
>>>
>>> I?m looking at Moyer?s modern alternators, and noticed that they give
>>> output figures for ?normal operating speed of 2000rpm?. Well even with the
>>> boosted rpm our Campbell prop allows, we still don?t get more than 1500
>>> going flat out? we cruise quietly at 1200.
>>>
>>> I understand our factory supplied alternators are ?30 amp? but what is it
>>> really delivering at real operational rpms?
>>>
>>> I understand that at lower rpm?s the alternator isn?t ?excited? so delivers
>>> little amperage?But I don?t know what the critical rpm rate is to achieve
>>> excitement
>>>
>>> I don?t understand this whole subject as well as I?d like to.
>>>
>>> Gordon Laco
>>> #426 Surprise
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> These businesses support your Association:
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>>> Please support them.
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>>>
>>> ------------------------------
>>>
>>> Message: 3
>>> Date: Mon, 16 Jul 2018 16:57:28 -0400
>>> From: Gordon Laco <mainstay at csolve.net>
>>> To: Alberg 30 Public List -- open to all
>>> <public-list at lists.alberg30.org>
>>> Subject: Re: [Public-List] Alternators...
>>> Message-ID: <2AAE1378-98D2-4A75-A4F0-DA86BA00064D at csolve.net>
>>> Content-Type: text/plain; charset=utf-8
>>>
>>> True, but it?s the engine that has the RPM instrument?
>>>
>>> Gordon Laco
>>> www.gordonlaco.com
>>> #426 Surprise
>>>
>>>
>>>
>>>> On Jul 16, 2018, at 4:53 PM, Anders Bro via Public-List <public-list at lists.alberg30.org> wrote:
>>>>
>>>> Ya, but isn't that alternator rpm and not engine speed? Usually the pulleys
>>>> are sized to have alternator rpm higher than engine rpm.
>>>> Anders
>>>>
>>>> On Jul 16, 2018 4:39 PM, "Gordon Laco via Public-List" <
>>>> public-list at lists.alberg30.org> wrote:
>>>>
>>>> Hello friends?
>>>>
>>>> Do any of you have data on what the output curve of our Atomic IV?s
>>>> alternators will put out at various RPM?s?
>>>>
>>>> I?m looking at Moyer?s modern alternators, and noticed that they give
>>>> output figures for ?normal operating speed of 2000rpm?. Well even with the
>>>> boosted rpm our Campbell prop allows, we still don?t get more than 1500
>>>> going flat out? we cruise quietly at 1200.
>>>>
>>>> I understand our factory supplied alternators are ?30 amp? but what is it
>>>> really delivering at real operational rpms?
>>>>
>>>> I understand that at lower rpm?s the alternator isn?t ?excited? so delivers
>>>> little amperage?But I don?t know what the critical rpm rate is to achieve
>>>> excitement
>>>>
>>>> I don?t understand this whole subject as well as I?d like to.
>>>>
>>>> Gordon Laco
>>>> #426 Surprise
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> 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
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>>>> _______________________________________________
>>>> These businesses support your Association:
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>>>
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 4
>>> Date: Mon, 16 Jul 2018 17:21:35 -0400
>>> From: Anders Bro <abro.gtu at gmail.com>
>>> To: Alberg 30 Public List -- open to all
>>> <public-list at lists.alberg30.org>
>>> Subject: Re: [Public-List] Alternators...
>>> Message-ID:
>>> <CACEd84t7K3n3eCvAF0SM+aU_8OgaCCpJ1zNQLeLtRwRSkjefDA at mail.gmail.com>
>>> Content-Type: text/plain; charset="UTF-8"
>>>
>>> Yes, so multiply that rpm by the pulley ratio to come up with alternator
>>> rpm, and make your own plot of output vs engine rpm?
>>>
>>> On Mon, Jul 16, 2018, 4:57 PM Gordon Laco via Public-List <
>>> public-list at lists.alberg30.org> wrote:
>>>
>>>> True, but it?s the engine that has the RPM instrument?
>>>>
>>>> Gordon Laco
>>>> www.gordonlaco.com
>>>> #426 Surprise
>>>>
>>>>
>>>>
>>>>> On Jul 16, 2018, at 4:53 PM, Anders Bro via Public-List <
>>>> public-list at lists.alberg30.org> wrote:
>>>>>
>>>>> Ya, but isn't that alternator rpm and not engine speed? Usually the
>>>> pulleys
>>>>> are sized to have alternator rpm higher than engine rpm.
>>>>> Anders
>>>>>
>>>>> On Jul 16, 2018 4:39 PM, "Gordon Laco via Public-List" <
>>>>> public-list at lists.alberg30.org> wrote:
>>>>>
>>>>> Hello friends?
>>>>>
>>>>> Do any of you have data on what the output curve of our Atomic IV?s
>>>>> alternators will put out at various RPM?s?
>>>>>
>>>>> I?m looking at Moyer?s modern alternators, and noticed that they give
>>>>> output figures for ?normal operating speed of 2000rpm?. Well even with
>>>> the
>>>>> boosted rpm our Campbell prop allows, we still don?t get more than 1500
>>>>> going flat out? we cruise quietly at 1200.
>>>>>
>>>>> I understand our factory supplied alternators are ?30 amp? but what is it
>>>>> really delivering at real operational rpms?
>>>>>
>>>>> I understand that at lower rpm?s the alternator isn?t ?excited? so
>>>> delivers
>>>>> little amperage?But I don?t know what the critical rpm rate is to achieve
>>>>> excitement
>>>>>
>>>>> I don?t understand this whole subject as well as I?d like to.
>>>>>
>>>>> Gordon Laco
>>>>> #426 Surprise
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> 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
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>>>>
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 5
>>> Date: Mon, 16 Jul 2018 17:37:06 -0400
>>> From: Gordon Laco <mainstay at csolve.net>
>>> To: Alberg 30 Public List -- open to all
>>> <public-list at lists.alberg30.org>
>>> Subject: Re: [Public-List] Alternators...
>>> Message-ID: <B8AA3311-6F99-4642-B15F-32EFC1C2D17E at csolve.net>
>>> Content-Type: text/plain; charset=utf-8
>>>
>>> Well that?s all quite logical? but the missing ingredient is the output by the alternator at various rpm.
>>>
>>> Gordon Laco
>>> www.gordonlaco.com
>>>
>>>
>>>
>>>
>>>> On Jul 16, 2018, at 5:21 PM, Anders Bro via Public-List <public-list at lists.alberg30.org> wrote:
>>>>
>>>> Yes, so multiply that rpm by the pulley ratio to come up with alternator
>>>> rpm, and make your own plot of output vs engine rpm?
>>>>
>>>> On Mon, Jul 16, 2018, 4:57 PM Gordon Laco via Public-List <
>>>> public-list at lists.alberg30.org> wrote:
>>>>
>>>>> True, but it?s the engine that has the RPM instrument?
>>>>>
>>>>> Gordon Laco
>>>>> www.gordonlaco.com
>>>>> #426 Surprise
>>>>>
>>>>>
>>>>>
>>>>>> On Jul 16, 2018, at 4:53 PM, Anders Bro via Public-List <
>>>>> public-list at lists.alberg30.org> wrote:
>>>>>>
>>>>>> Ya, but isn't that alternator rpm and not engine speed? Usually the
>>>>> pulleys
>>>>>> are sized to have alternator rpm higher than engine rpm.
>>>>>> Anders
>>>>>>
>>>>>> On Jul 16, 2018 4:39 PM, "Gordon Laco via Public-List" <
>>>>>> public-list at lists.alberg30.org> wrote:
>>>>>>
>>>>>> Hello friends?
>>>>>>
>>>>>> Do any of you have data on what the output curve of our Atomic IV?s
>>>>>> alternators will put out at various RPM?s?
>>>>>>
>>>>>> I?m looking at Moyer?s modern alternators, and noticed that they give
>>>>>> output figures for ?normal operating speed of 2000rpm?. Well even with
>>>>> the
>>>>>> boosted rpm our Campbell prop allows, we still don?t get more than 1500
>>>>>> going flat out? we cruise quietly at 1200.
>>>>>>
>>>>>> I understand our factory supplied alternators are ?30 amp? but what is it
>>>>>> really delivering at real operational rpms?
>>>>>>
>>>>>> I understand that at lower rpm?s the alternator isn?t ?excited? so
>>>>> delivers
>>>>>> little amperage?But I don?t know what the critical rpm rate is to achieve
>>>>>> excitement
>>>>>>
>>>>>> I don?t understand this whole subject as well as I?d like to.
>>>>>>
>>>>>> Gordon Laco
>>>>>> #426 Surprise
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> 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
>>>
>>>
>>>
>>> ------------------------------
>>>
>>> Message: 6
>>> Date: Mon, 16 Jul 2018 17:42:49 -0400
>>> From: Anders Bro <abro.gtu at gmail.com>
>>> To: Alberg 30 Public List -- open to all
>>> <public-list at lists.alberg30.org>
>>> Subject: Re: [Public-List] Alternators...
>>> Message-ID:
>>> <CACEd84v1VXz1Mnm36vK9v=9bBY2mRfCKuJhQBbXXhK8BYfPWFA at mail.gmail.com>
>>> Content-Type: text/plain; charset="UTF-8"
>>>
>>> Oops, I thought you had that :-( sorry about that. Maybe get it from Delco,
>>> or whoever the mfg is??
>>>
>>> On Mon, Jul 16, 2018, 5:37 PM Gordon Laco via Public-List <
>>> public-list at lists.alberg30.org> wrote:
>>>
>>>> Well that?s all quite logical? but the missing ingredient is the output by
>>>> the alternator at various rpm.
>>>>
>>>> Gordon Laco
>>>> www.gordonlaco.com
>>>>
>>>>
>>>>
>>>>
>>>>> On Jul 16, 2018, at 5:21 PM, Anders Bro via Public-List <
>>>> public-list at lists.alberg30.org> wrote:
>>>>>
>>>>> Yes, so multiply that rpm by the pulley ratio to come up with alternator
>>>>> rpm, and make your own plot of output vs engine rpm?
>>>>>
>>>>> On Mon, Jul 16, 2018, 4:57 PM Gordon Laco via Public-List <
>>>>> public-list at lists.alberg30.org> wrote:
>>>>>
>>>>>> True, but it?s the engine that has the RPM instrument?
>>>>>>
>>>>>> Gordon Laco
>>>>>> www.gordonlaco.com
>>>>>> #426 Surprise
>>>>>>
>>>>>>
>>>>>>
>>>>>>> On Jul 16, 2018, at 4:53 PM, Anders Bro via Public-List <
>>>>>> public-list at lists.alberg30.org> wrote:
>>>>>>>
>>>>>>> Ya, but isn't that alternator rpm and not engine speed? Usually the
>>>>>> pulleys
>>>>>>> are sized to have alternator rpm higher than engine rpm.
>>>>>>> Anders
>>>>>>>
>>>>>>> On Jul 16, 2018 4:39 PM, "Gordon Laco via Public-List" <
>>>>>>> public-list at lists.alberg30.org> wrote:
>>>>>>>
>>>>>>> Hello friends?
>>>>>>>
>>>>>>> Do any of you have data on what the output curve of our Atomic IV?s
>>>>>>> alternators will put out at various RPM?s?
>>>>>>>
>>>>>>> I?m looking at Moyer?s modern alternators, and noticed that they give
>>>>>>> output figures for ?normal operating speed of 2000rpm?. Well even with
>>>>>> the
>>>>>>> boosted rpm our Campbell prop allows, we still don?t get more than 1500
>>>>>>> going flat out? we cruise quietly at 1200.
>>>>>>>
>>>>>>> I understand our factory supplied alternators are ?30 amp? but what is
>>>> it
>>>>>>> really delivering at real operational rpms?
>>>>>>>
>>>>>>> I understand that at lower rpm?s the alternator isn?t ?excited? so
>>>>>> delivers
>>>>>>> little amperage?But I don?t know what the critical rpm rate is to
>>>> achieve
>>>>>>> excitement
>>>>>>>
>>>>>>> I don?t understand this whole subject as well as I?d like to.
>>>>>>>
>>>>>>> Gordon Laco
>>>>>>> #426 Surprise
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> 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:
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>>>>> Please support them.
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>>>>
>>>> _______________________________________________
>>>> These businesses support your Association:
>>>> http://www.alberg30.org/store/A30supporters.html
>>>> Please support them.
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>>>
>>>
>>> ------------------------------
>>>
>>> Subject: Digest Footer
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>>> ------------------------------
>>>
>>> End of Public-List Digest, Vol 3679, Issue 1
>>> ********************************************
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