[Public-List] Public-List Digest, Vol 3998, Issue 4 Two blades prop

[Greg Hounsell]

Oh.. silly me.. don't know why but I was assuming that you weren't under
sail, just in neutral at the dock lol..

Greg
#592

On Sun, Apr 26, 2020, 7:41 PM Greg Aldworth via Public-List <
public-list at lists.alberg30.org> wrote:

> The prop will “windmill” with the engine in neutral. The vessel is moving
> forward under sail and water is flowing past the prop. With the 3 bladed
> prop, there will always be enough prop. surface area exposed to keep it
> spinning. I think with a 2 bladed props, they tend to lose thrust when in
> the shadow of the keel.
> I have a larger motor vessel and if we shut down one engine, that prop
> will windmill when we are underway.
> Does this sound right Gord?
> Greg
>
> Sent from Mail for Windows 10
>
> From: Greg Hounsell via Public-List
> Sent: April 26, 2020 6:49 PM
> To: Alberg 30 Public List -- open to all
> Cc: Greg Hounsell
> Subject: Re: [Public-List] Public-List Digest, Vol 3998, Issue 4 Two
> blades prop
>
> I don't understand how a prop would cause rotation when in neutral. Is
> there a strong tide or current?
>
> Greg
> #592
>
> On Sun, Apr 26, 2020, 6:06 PM Daniel Swords via Public-List <
> public-list at lists.alberg30.org> wrote:
>
> >     The PO of my boat had replaced the original two blade prop with a
> > three blade prop, but fortunately had saved the original. I disliked the
> > three blade so much that I paid to have the boat hauled just to replace
> it
> > with the original two blade.
> >
> >
> >
> >     If left in neutral the three blade spun continuously and noisily and
> > created enough turbulence to feel through the tiller. If left in gear
> > (something Yanmar recommends against) the transmission would lock-up with
> > even the slightest forward motion such that the safety interlock would
> > prevent starting the engine.     As far as I can tell the two blade prop
> > does not spin in neutral and typically parks vertically behind the keel.
> > Also, I did not notice any significant advantages with the three blade
> prop
> > so I gave mine away and have never considered going back.     Currently
> > sailing on Lake Pontchartrain, winds 15 gusting to 19 knots, double
> reefed
> > main and 110% jib. Daniel SwordsSolitude, Hull #525Mandeville, Louisiana
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