[C320-list] Boat Draft and Grounding (Wing Keel)
Dean Vermeire
dean at vermeire.us
Fri Aug 13 14:42:02 PDT 2010
I have #847. What do I win?
Dean Vermeire
Moonstruck II (#847)
BAdams3491 at aol.com wrote:
> 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
>>
>>
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