[Public-List] Best prop?

Wed Jun 19 06:56:59 PDT 2024

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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