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23/07/03 14:51:33

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Subject: Re: TS240 Keel repairs - again. Author: Godfrey [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 29/04/05 22:37:54 In reply to: Jonathan Dodd 's message, "TS240 Keel repairs - again." on 26/04/05 20:48:52 Jonathan I have some original drawings from the designer which show the angle iron to be all one casting, not two separate pieces. On my boat (hull no 26), the exposed steel is now down to about half its original thickness where most exposed but since this has taken 20 years so far, I am not too worried. It would all have to disappear before the keel could fall out. As Alan says, the lifting mechanism would prevent a total disaster. The upstands have wide horizontal flanges which are glassed in between the bottom of the keel box and the inside of the hull. I have already promised copies of the drawings to some other people so I will get some extra copies made if you want to send me your address. The previous owner replaced the top box with a galvanised steel equivalent which is still looking good after 6 years. I had problems getting the keel to go down the last bit. When the keel is up, I have found the weight is on the front wheels on the box as the keel tries to lean forwards. As you lower, the weight on the front wheels reduces until you reach a point where the keel starts to try to lean backwards, probably when the CG drops below the roller and the pressure transfers to the back wheels. From here on downwards, the pressure on the back wheels increases until you reach a point with the keel almost down where the keel is trying to rotate forwards under the roller and pressure on the rear box wheels is resisting it, quite a high load I should imagine. I fitted a new bottom roller (the old one had seized) and found that this reduced the problem considerably. The new roller is made of polyurethane instead of nylon as this is bit softer and does less damage to the antifouling on the leading edge of the keel. Incidentally, I assume Azurian has no hull number, being the original boat? Regards Godfrey Whitehouse TS240 "Fooster" gwhitehouse@onetel.net [ Next Thread | Previous Thread | Next Message | Previous Message ]