[Public-List] Prop while sailing, locked or free to spin ?

[Michael Grosh via Public-List]

That is interesting. I'm always amazed at engineering details that emerge
when the rock is lifted to see what"s underneath.
So the act of basically screwing itself through the water wouldn't negate
the circular drag factor?
Michael Grosh
#220
On Apr 22, 2016 12:03 PM, "Gordon Laco via Public-List" <
public-list at lists.alberg30.org> wrote:

> But of course it should be kept in mind that a windmilling prop generates
> drag which is calculated as a function of the swept circle... Whereas a
> locked prop generates drag calculated as a function of the blade area
> alone.
> A locked prop is significatly better with regard to sailing performance...
>
> Gord #426 Surprise (hard at it preparing PICTON CASTLE for sea here in
> Lunenburg)
>
>
> On 2016-04-22, 10:54 AM, "Wes Gardner via Public-List"
> <public-list at lists.alberg30.org> wrote:
>
> > I just heard from Chris, for my motor/trans, he says I can let it turn...
> >
> > Wes
> > Griffin's Faith #196
> >
> > On Fri, Apr 22, 2016 at 10:30 AM, Wes Gardner <wesgardner1952 at gmail.com>
> > wrote:
> >
> >> From what I can tell, some transmissions don't like being turned while
> the
> >> motor is not running and some don't care.  Mine, from what I can tell
> from
> >> Chris Oliver is a "splash type" trans.  I will hazzard a guess that mine
> >> wouldn't care (as long as the fluid is at the correct level).  Chris
> >> commented on this while we were reinstalling my motor - he says that
> these
> >> types of transmissions are fairly sensitive to both "too high" and "too
> >> low"  fluid levels...I have a Vetus 3.10.
> >>
> >> Hopefully others will have more...
> >>
> >> Wes
> >> Griffin's Faith #196
> >>
> >> On Fri, Apr 22, 2016 at 10:23 AM, Jonathan Bresler via Public-List <
> >> public-list at lists.alberg30.org> wrote:
> >>
> >>> Folks,
> >>>
> >>> Have heard from list members to lock the prop while while.  Several of
> our
> >>> racing members do so by putting the A-4 into gear after rotating the
> shaft
> >>> to "hide" the two blade prop behind the deadwood.   Some folks use a
> >>> vise-grip on the shaft with the handle against the hull to stop the
> shaft
> >>> and prop from spinning.
> >>>
> >>> While sailing last night, I came up with a slightl different way to
> lock
> >>> the prop.  Wrapped the rubber strap from a rubber strap oil filter
> wrench
> >>> around the shaft till the handle was held against the hull.   Worked
> >>> great.  Getting it off, required a good steady pull on the handle to
> spin
> >>> the shaft backwards a few rotations.  Had picked up a pair of these
> strap
> >>> wrench at Advance Auto in their discount bin for $5.00, I seem to
> >>> remember.  Useful for removing the oil filter, as well.
> >>>
> >>> So what do you do ?
> >>> Lock the shaft or not?
> >>> If you lock the shaft, how ?
> >>>
> >>> Sample:
> >>>
> >>>
> https://www.buysend.com/en-US/Product/Details/20985?U=2pc-silverline-500mm-6
> >>>
> 00mm-mechanics-plumber-rubber-strap-wrenches/&gclid=Cj0KEQjwl-e4BRCwqeWkv8TW
> >>> qOoBEiQAMocbP9E1Gluu36O8RLAr6XhNvZTNK4zs6HU8NoPloic7aY8aAs0c8P8HAQ
> >>>
> >>> --
> >>> Jonathan M Bresler
> >>> S/V Constance Alberg 30 #262
> >>> Annapolis/Eastport MD
> >>> _______________________________________________
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> >>
> >>
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