[Public-List] Propellors

[Anders Bro]

It shakes off the barnacles.

On Mon, Jun 24, 2019, 9:27 AM Michael Devonshire via Public-List <
public-list at lists.alberg30.org> wrote:

> Why would they do that!?
>
> Michael Devonshire
> Director of Conservation
> JHPA, Inc.
> 212-759-6462
> 212-759-6540 f
> Direct: 646-666-9326
>
>
> -----Original Message-----
> From: Public-List [mailto:public-list-bounces at lists.alberg30.org] On
> Behalf Of Gordon Laco via Public-List
> Sent: Monday, June 24, 2019 8:28 AM
> To: Alberg 30 Public List -- open to all
> Cc: Gordon Laco
> Subject: [Public-List] Propellors
>
> So there I was, yakking it up with a friend about how pleased I am with my
> new prop… besides the performance I commented how much quieter the boat is
> under power with the narrow three blader we have now than she was with the
> stock two blade one she came out of Whitby Boatworks with… and which she
> had fitted to her for all of the previous 49 years of service.
>
> My friend asked me what pitch and diameter the old prop was.  I’d
> forgotten so I took it off my book shelf where it is now an ornament.
>  What did I discover?  The damned shaft hole is off-centre.   Yes, the prop
> was made with the shaft hole off-centre.   Crazy.  Well no wonder the new
> prop is ‘quieter’.    Three blades are of course smoother than two due to
> at least two blades always in clear flow whereas with a two blade prop the
> whole thing is blanketed by the sternpost twice per rotation… but off
> centre…. that must really have made whatever was inherent in the thing
> worse.
>
> Onwards…
>
> Gordon Laco
> Surprise #426
>
>
>
>
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