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  1. #51
    Join Date
    May 2001
    Location
    North from the Nab about 10 miles
    Posts
    8,779

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by lw395 View Post
    That's a pretty stupid generalisation.

    Lots of yachts beach with two legs.
    Cradles have four legs for redundancy, so you can drop one.
    If you believe that, try taking a leg off a chair and tell me whether its still safe to use. Small wonder the yards make such an issue about it!
    Is Conservation for wildlife or conservationists?
    http://boatownersresponse.org.uk

  2. #52
    Join Date
    May 2007
    Posts
    36,212

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by oldharry View Post
    If you believe that, try taking a leg off a chair and tell me whether its still safe to use. Small wonder the yards make such an issue about it!
    The three legged stool is a time-honoured concept.
    Actually I don't think I know of any yards making an issue of cradle legs being lowered, the issue is letting clueless customers fiddle with the cradles.

  3. #53
    Join Date
    May 2007
    Posts
    36,212

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by JumbleDuck View Post
    I taught both structural analysis and 3D kinematics to engineering students for twenty years, and do not consider myself qualified to drop props. People who think it's easy simply haven't realised how complicated it is.
    Yes.
    I met plenty of lecturers in electronics who I wouldn't trust to wire a plug or put the battery in a torch.

  4. #54
    Join Date
    May 2012
    Posts
    349

    Default Re: Boat falls off cradle killing owner at Weymouth

    This is probably a clueless question, but hey ho.
    Is it not possible, when a boat is propped up, to put another prop alongside an existing one, then remove the first one so that where the first one was can be anti-fouled, painted, etc?

  5. #55
    Join Date
    Oct 2018
    Location
    A Member State of the European Union
    Posts
    4,407

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by lw395 View Post
    The three legged stool is a time-honoured concept.
    It is. However, it works best when the three legs are spaced equidistant around the edge of the stool
    " Brexit is like watching your library being burned down by people who can't read"

  6. #56
    Join Date
    Jun 2017
    Posts
    725

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by Poignard View Post
    It is. However, it works best when the three legs are spaced equidistant around the edge of the stool
    Yes, exactly. Which is not the same as a four-leg cradle with one leg lowered.

  7. #57
    Join Date
    May 2007
    Posts
    36,212

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by Poignard View Post
    It is. However, it works best when the three legs are spaced equidistant around the edge of the stool
    A true physicist was once said to be someone who could not discuss a three legged stool without mentioning (at length) stools with a) one leg, and b) infinitely many legs.

    The world is full of cretins who cannot see if their boat is likely to be blown over.
    Sad really.

  8. #58
    Join Date
    Feb 2006
    Posts
    2,758

    Default Re: Boat falls off cradle killing owner at Weymouth

    The real point here is that cradles SHOULD be designed so that one leg at a time can be dropped safely, and antfouling completed properly. But I can still see that marinas / boatyards will want this to be done by their staff, not a random selection of owners.

  9. #59
    Join Date
    Nov 2008
    Posts
    6,795

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by Resolution View Post
    The real point here is that cradles SHOULD be designed so that one leg at a time can be dropped safely, and antfouling completed properly. But I can still see that marinas / boatyards will want this to be done by their staff, not a random selection of owners.
    Maybe all cradles should have six legs (like mine).

  10. #60
    Join Date
    Oct 2002
    Location
    Plymouth
    Posts
    8,364

    Default Re: Boat falls off cradle killing owner at Weymouth

    Quote Originally Posted by newtothis View Post
    This is probably a clueless question, but hey ho.
    Is it not possible, when a boat is propped up, to put another prop alongside an existing one, then remove the first one so that where the first one was can be anti-fouled, painted, etc?


    Yes, I think you have something here, the theorists have overlooked this one :-).

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