[Public-List] Best prop?

[Mike Lehman]

I have a 3 blade 12 diameter  10 pitch 7/8 shaft on our A30  with a
Universal 30 hp 4 cylinder.  People comment that I could pull water skiers.
The reason for 12" is to reduce prop wash and noiseon the hull.

On Wed, Jun 19, 2024, 9:57 AM Pier-Andre Bouchard St-Amant via Public-List <
public-list at lists.alberg30.org> wrote:

> I understand. I would not have undertaken such task if Jean-du-Sud already
> had an aperture.
>
> You can however reduce the featherstream size to fit a standard apterture.
> Which size is best, then, is a question for someone else.
>
> Fair winds!
>
> Pier, #399.
>
>
> --
> Pr Pier-André Bouchard St-Amant
>
> Bur.: +1-514-849-3989 #3923
> Cell.: +1-514-424-6632
> pabsta.qc.ca <http://pabsta.qc.ca/>
>
> > Le 19 juin 2024 à 09:38, John Johnston via Public-List <
> public-list at lists.alberg30.org> a écrit :
> >
> > Thanks, Pier for the prompt and very informative reply. Changing the
> aperture size to accommodate a larger prop is an interesting approach, and
> perhaps one I will pursue in the future while hauled out. What I am seeking
> right now is an off the shelf prop that will work best within existing
> limitations of the aperture. I don’t want to miss another Summer not
> sailing, and I don’t have the time ( nor the heart) to do more than a quick
> > haulout and install.
> >
> > All the best,John
> > Sent from my iPad
> >
> >> On Jun 19, 2024, at 8:51 AM, Pier-André Bouchard St-Amant via
> Public-List <public-list at lists.alberg30.org> wrote:
> >>
> >> Hi John,
> >> I used a 13" featherstream 3 props on Jean-du-Sud. Here for the model:
> >>
> >> https://www.darglow.co.uk/featherstream/
> >>
> >>
> >> Here for the original calculations:
> >> https://en.jeandusud.com/repowering-an-alberg-30-part-1/
> >>
> >> The biggest downside of this model is the price. The upside is reduced
> drag.
> >>
> >> Upon purchase, they will adjust the blades' angle to the most efficient
> angle at peak power. You can adjust the angle at a later time, or ask them
> for an angle specific to your calculations (peak power at low rpm, etc)
> >>
> >> I would pay attention to the propeller size and the rudder max
> availlabe size while in a full turn (on both sides). That is also an
> implicit limit on the propeller size.
> >>
> >> Best,
> >>
> >> Pier, #399
> >>
> >>
> >>
> >> Le 19 juin 2024 08 h 36 min 09 s HAE, John Johnston via Public-List <
> public-list at lists.alberg30.org> a écrit :
> >>> Hello folks, especially those Alberg owners who have diesel engines -
> Can you recommend a 3 blade prop that is suitable for the aperture
> limitations? The 14” height calls for a smaller prop to be effective-
> >>> Thanks!
> >>> John Johnston
> >>> Alberg 69
> >>> Sent from my iPad
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