[Public-List] propeller

[Gordon Laco via Public-List]

Or another way to understand 'slip' is to consider the propeller as a screw (which it is).   If the prop is said to have a 7" pitch, that means that if it were in a solid substance like wood, it would advance 7" every full rotation.  

Well it's not in wood, its in water, so every full rotation of the prop only moves it (and the boat it's attached to) forward about 3.5".... So the 'slip' is said to be about 50%.  

Interesting stuff

Gord 426 Surprise.  

On 2016-02-23, at 10:18 PM, Chip Dance via Public-List <public-list at lists.alberg30.org> wrote:

> Don
> My limited motoring experience has only been with outboards, and, as I said
> limited. Could you explain what you mean by "slip"?
> 
> Thanks
> Chip
> 
> On Tue, Feb 23, 2016 at 7:55 PM, Michael Connolly via Public-List <
> public-list at lists.alberg30.org> wrote:
> 
>> Charles,
>> I have original set-up with Gray Marine and 13 x 9 two blade prop.
>> Michael #133
>> 
>> ----- Original Message -----
>> 
>> From: "charles pleisse via Public-List" <public-list at lists.alberg30.org>
>> To: public-list at lists.alberg30.org
>> Sent: Tuesday, February 23, 2016 8:49:16 AM
>> Subject: [Public-List] propeller
>> 
>> I have the engine (original A4) out this winter so I can replace shaft and
>> associated hardware and I'm thinking of trying a two blade prop for better
>> sailing performance.  The current prop is a three blade 12x5.  What was
>> spec'ed originally on these boats and should any consideration be given to
>> the age of the engine when determining propeller pitch?
>> 
>> Charles Pleisse
>> Sookie #221
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