bluff
New member
Hi folks has anyone had problems with lifting keels slipping up during a knockdown and slapping down after the boat rights
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lifting keels
- Thread starter bluff
- Start date
webcraft
Well-known member
I think that with some designs if they slipped up during a knockdown then there would be an increased chance of inversion with a much reduced chance of the boat then righting - although this isn't the case with Southerlies, which still seem to have a remarkable AVS with the keel retracted.
If it's just a 90 deg knockdown I can't see any force that is likely to swing or retract the keel . . . the boat would have to go well past 90 deg for gravity to do the job. If I was sailing in conditions where there was the posibility of a knockdown I would definitely have the keel locked down anyway.
This seems like a curious question. Also I see you are a new user with no details in your bio. I trust you don't live under bridges and prey on poor little billy goats?
- Nick
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If it's just a 90 deg knockdown I can't see any force that is likely to swing or retract the keel . . . the boat would have to go well past 90 deg for gravity to do the job. If I was sailing in conditions where there was the posibility of a knockdown I would definitely have the keel locked down anyway.
This seems like a curious question. Also I see you are a new user with no details in your bio. I trust you don't live under bridges and prey on poor little billy goats?
- Nick
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BobE
Member
Hi, I've a lifting plate weighing a measley 300lbs which retracts / swings into a cast keel of 4000lbs +. Its lifted by a wire strop and pivots like a dinghy c/b
The strop is controlled by a hydrobolic ram which is directly under the deck stepped mast. Have to pump it up but it drops on its own.
If inverted it would clatter up against the top of the keel 'cause it's cutaway at the back. IE its rectangular with the back bottom corner missing!
There is a tube glassed into the top of the slot (just where the cutaway starts) which reduces my tabletop booze stowage by one bottle..
The top of the tube has a deck water filler assembly glassed to it and if the plate gets jammed half or fully up, the cap can be taken off and the plate bashed down with a spare bit of old propeller shafting... Though she goes pretty damn good to windward with the plate up and it's really only used to stop the crew from rolling out of their bunks in Braye easterlies!!!
Welcome to the madhouse!!
Cheers Bob E..
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The strop is controlled by a hydrobolic ram which is directly under the deck stepped mast. Have to pump it up but it drops on its own.
If inverted it would clatter up against the top of the keel 'cause it's cutaway at the back. IE its rectangular with the back bottom corner missing!
There is a tube glassed into the top of the slot (just where the cutaway starts) which reduces my tabletop booze stowage by one bottle..
The top of the tube has a deck water filler assembly glassed to it and if the plate gets jammed half or fully up, the cap can be taken off and the plate bashed down with a spare bit of old propeller shafting... Though she goes pretty damn good to windward with the plate up and it's really only used to stop the crew from rolling out of their bunks in Braye easterlies!!!
Welcome to the madhouse!!
Cheers Bob E..
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T_S
New member
Its a pity you have posted your thread in two sections of this forum bluff. You could have a good topic here! Anyway I have posted a reply for you in the other section.
<hr width=100% size=1>Trailer Sailors get there by road!
<hr width=100% size=1>Trailer Sailors get there by road!
mirabriani
New member
With some yachts, like the E Boat you can lock it down and make it into a fin keeler.
With my Trapper there is a friction screw which can be adjusted. I suspect it is mainly used to stop it making noises in a chop.
Welcome, but give us some more detail of your concerns.
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With my Trapper there is a friction screw which can be adjusted. I suspect it is mainly used to stop it making noises in a chop.
Welcome, but give us some more detail of your concerns.
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snowleopard
Active member
i believe that when doing avs calculations for a design with a lift keel you have to do them with the keel up unless there is a mechanism to positively lock them down.
i was reading the YM review of the southerly yesterday and got to wondering when i'd use the locking pin. obviously not in shallow water so it can kick up if you hit bottom as i often did with my swing-keel sonata. in heavy weather offshore it would be locked of course, but in normal cruising would you leave it unlocked in case of hitting submerged objects?
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i was reading the YM review of the southerly yesterday and got to wondering when i'd use the locking pin. obviously not in shallow water so it can kick up if you hit bottom as i often did with my swing-keel sonata. in heavy weather offshore it would be locked of course, but in normal cruising would you leave it unlocked in case of hitting submerged objects?
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bluff
New member
thanks for all the replies i am thinking of buying a beneteau 235 .1 for sale is a fin a drop keel would suit our drying harbour
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BobE
Member
C'mon Bluff
Fill in your details - For Example Which drying harbour?
Cheers Bob E...
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Fill in your details - For Example Which drying harbour?
Cheers Bob E...
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graham
Well-known member
My boat is a lifting keel Anderson 22.The keel weighs about half a ton and is raised with a manual braked winch .
Some years ago 2 of them did a transatlantic race and had a bolt fitted to lock the keel down.
For normal coastal sailing I dont think it is neccessary and if you grounded with the keel bolted you would loose all the advantage of the lifting keel.
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Some years ago 2 of them did a transatlantic race and had a bolt fitted to lock the keel down.
For normal coastal sailing I dont think it is neccessary and if you grounded with the keel bolted you would loose all the advantage of the lifting keel.
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