[C320-list] Boat Draft and Grounding (Wing Keel)

[BAdams3491 at aol.com]

My rudder comment is from looking at pictures of my boat sitting on  the 
trailer prior to launching...nothing scientific.  Also, FWIW, Catalina  went 
from the deeper wing to the shorter wing starting with hull #847, so now it  
is the same keel as the wing on the C310.
 
Bert
At Ease
#442
 
 
In a message dated 8/13/2010 2:29:20 P.M. Central Daylight Time,  
dcnolte at mac.com writes:

Careful  Bert, with the wing keel I believe that our rudders are  
slightly  deeper than our keels, by several inches.

At least mine is, and the  other 320s I have seen out of the water.

So you need to exercise  special care if you ground, especially if you  
try to turn to get  off. If you turn on your keel to get off and then  
make contact with  the rudder and the bottom, you can damage the rudder.

David  Nolte
Beach House 4


On Aug 13, 2010, at 3:14 PM,  BAdams3491 at aol.com wrote:

> Just my opinion, but I doubt the boat  draft would be  affected  
> whether in
> fresh or salt  water.  Might matter with the Queen  Mary, but I don't   
> think it
> would with our boats.
>
> If you have  looked at your wing keel, you can see it is quite wide,   
>  and
> that the keel is lower than the rudder.  Canting the hull to  the  
> side  would
> only serve to bury that side of  the wing in the bottom of the  
> lake.   I have
>  been aground only once in this boat, and that was not a 'hard'    
> grounding.
> I got off by making an immediate turn and  adding  power.
>
> Bert
> At Ease
>  #442
>
>
> In a message dated 8/13/2010 2:00:37 P.M. Central  Daylight Time,
> amiraults at sympatico.ca writes:
>
>  All:
>
> My sailing ground (Ottawa River above Parliament  Hill,  Ottawa  
> Canada) is
> experiencing historic low  water levels due to low  rainfall and last
> winter's
> low  snowfall. The result of this has been deep  keel boats unable to   
> leave
> harbour due to the risk of grounding at the   harbour entrance.  
> Yesterday
> afternoon on entering  harbour I gently bumped  the bottom at this  
>  entrance
> but did not get hung up. For the evening's  races I took  the same  
> course in
> and out as that morning's departure  and had  no problem; although  
> all of the
> crew was  at the bow to raise the stern a  bit in hopes that if I do  
>  hit
> bottom it will not be with the rudder.
>
> Two  questions. Bear's nominal draft with wing keel is 4'10''. I was    
> asked
> by
> the club manager (when I reported the bump  with the bottom)  whether  
> this
> measurement was for  salt or fresh water. Would there be that  much  
> of  a
> buoyancy difference?
>
> My take on grounding is that  trying  to cant the hull to one side to  
> float
> her  off is a non-starter as this  would actually deepen the draft as   
> the
> wing
> tilts down further into the  bottom. Is  there any reasonable hope of  
> this
> solution working by  tilting  the hull far enough over, or is a pull  
> off  by
> another boat the only  solution (bearing in mind that the area  has no
> tugboat-like craft available  as this stretch of the river  is an  
> inland
> waterway)?
>
> I have yet  to  ground Bear, but if a grounding will leave her  
>  stranded then
> I
> may have to  tie her up until we get  appreciable rainfall.
>
> Regards;
>
> Brian   Amirault
> 797 Waltzing Bear,   too
>