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

[via Public-List]

The drag difference is not large, but the unnecessary wear on shaft log and sometimes gears usually pushes larger ships to lock an inactive shaft  

Mike

Michael J. Meinhold 
meinhold272 at gmail.com / 301 852 0619

> On Apr 22, 2016, at 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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