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

[Gordon Laco via Public-List]

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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