[Public-List] Propeller Question

[Mike Lehman]

Sue, finally  got down to the boat...my prop is:
12" diameter x 10 pitch, 3 blade on 7/8" shaft. Righ hand.

Hope this help

On Thu, Feb 29, 2024, 2:33 PM Mike Lehman <mlehman at gmail.com> wrote:

> Next time I'm at my boat, I'll check the diameter and pitch. I have a
> Universal M430 (30 HP) and have no speed issues. I changed the original
> prop when I repowered. I'll send you a picture of the prop.
>
> On Thu, Feb 29, 2024, 2:27 PM Sue Pilling via Public-List <
> public-list at lists.alberg30.org> wrote:
>
>> Even though I have a 25hp Westerbeke diesel, I found my Alberg would
>> sometimes hardly make way against wind/waves.
>> It is a three blade prop, not sure of diameter and pitch as not near boat.
>> Wondered who to ask re this
>> Thanks Sue. (A30 #63)
>>
>> > On Feb 19, 2024, at 5:18 PM, Markus Hutzler via Public-List <
>> public-list at lists.alberg30.org> wrote:
>> >
>> > I made the conversation last year and I’m getting lower speeds. I have
>> a 1:2 gear (belt) and i’m using some random prop the boat came with. This
>> said, I’m not concerned about range. I just need to get in an out of the
>> mooring and have some backup in emergencies.
>> >
>> > 10A (550W): 2.2 kn
>> > 20A (1.1kW): 2.8 kn
>> > 40A (2.2kW): 3.3 kn
>> >
>> > I will record some more numbers once the ice melts.
>> >
>> > Cheers, Markus
>> >
>> >> On Feb 4, 2024, at 16:28, Hugh McCormack via Public-List <
>> public-list at lists.alberg30.org> wrote:
>> >>
>> >> Good day all,
>> >>
>> >> I know that there are some Albergs that have been converted to
>> electric motor propulsion and I am contemplating this myself since the
>> original inboard Graymarine has issues that are not worth fixing.
>> >>
>> >> In searching through the list archives I have found some useful
>> information but one bit of helpful data seems to be hard to find.  This
>> applies not just to Alberg conversions but to those on other manufacturers'
>> boats as well.  What I am looking for is a table or graph showing the
>> relationship between motor wattage draw and boat speed through the water
>> and/or shaft rpm (which, with details about the prop, can be converted to
>> boat speed).  Has anyone here who has converted to electric propulsion
>> recorded this data for their boat under various conditions?
>> >>
>> >> One motor supplier gave me the following (which helps to a point but
>> was derived in calm water from a "similar" boat):
>> >> 3.5 knots - ~1000 watts (~20 amps)
>> >> 4.5 knots - ~2000 watts (~40 amps)
>> >> 5.5 knots - ~5000-6000 watts (~100-125 amps)
>> >> 6 knots (hull speed) - ~12,000-15,0000 watts (~250-312 amps)
>> >> Most can only provide motor data from a test bench which has no
>> connection to real operating conditions with influences such as prop
>> pitch/diameter/# of blades, and boat hydrodynamics when motoring into a
>> headwind or in choppy seas.
>> >>
>> >> Having this data will help me determine optimum battery bank capacity
>> which then determines bank size and associated costs.
>> >>
>> >> Thanks in advance if you can help.
>> >>
>> >> Cheers,
>> >>
>> >> Hugh
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