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    Brixham trawler IBEX
    by bellman1942 πŸ‡¬πŸ‡§ ( Leading Seaman)
    πŸ“£










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    21 Posts 20 Replies 5 Photos 21 Likes
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    sam
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    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 11 hours ago
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    Hi again,

    To remind you - I'm about to start a build of Cariad - about a meter long fiberglass hull made by Chris Wynn-Brown. Selecting the auxiliary motor I'm looking at a m500 but any thoughts about the prop used. Thinking 2 blade fairly small, 25mm. Not needed for speed, just to get to shore if the wind dies. And originally auxiliary motors/props would have been small. Does this sound right? Sam
    steve-d
    Chief Petty Officer 2nd Class
    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 2 months ago
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    You don't have to think too hard about the keel position at this time as the bolt does not need to be central to the length of the keel. Just choose a rough position and do your hole in the hull.
    Later when you know more about how much weight you need and where it needs to be positioned you just make the keel to suit the rod position.

    Steve
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    sam
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    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 11 hours ago
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    Edward,

    Yes - thinking out problems is half the fun😊

    My first build was a Vic Smeed Starlet - just completed. Pretty straight forward but I over engineered it to try out some ideas - thinking the ideas through was great fun.

    So although I will not start the Cariad until January I'm trying to explore problems now. The angle of the rudder shaft is one that I think I have a solution to. Take it right through the deck then put a handle onto it, hinged at the shaft so that it does not rise and fall as it is turned. Then a Bowden cable from each side of the cockpit to power the steering. I will enjoy building a mock up and trying it out!


    As to the rudder, I am thinking of a detachable extension - downwards.

    I'm also thinking about placing the prop to one side - perhaps more authentic but also well clear of the rudder.

    One thing that I'm still thinking through is the access hatch. I see some builders move the dingy to the centre and create a hatch here but I like the clean decking on the original, with the dingy to the side. A hatch to the side would work for everything but the top screw for the detachable keel. Some more time dreaming up a solution.


    Thanks


    Sam
    4
    cenbeth
    Chief Petty Officer 1st Class
    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 3 months ago
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    Hi Sam,

    Yes, a Monoperm Super I think it is. it is only small as I reckon the original would only have had a small motor.

    I had issues with getting the rudder to work because the rudder shaft is at an angle. Another thing I'm anticipating is the size of the rudder; it may need to be increased in size.

    I think that thinking how problems can be overcome is half the fun!

    Edward
    sam
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    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 11 hours ago
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    Edward,

    I'm going to cast a bulb which gives me some tolerance in positioning it on the keel to help with the final trim. Probably make the keel from two sheets of balsa with a central threaded rod screwed and epoxied to the bulb. But that's for a later stage, right now I want to build the shaft into the hull before fitting the deck.

    Are you fitting an auxiliary motor? if so what sort of motor is most suitable?

    Quite looking forward to starting but likely to hafe to wait until after Christmas - work intervienes

    Thanks

    Sam
    1
    cenbeth
    Chief Petty Officer 1st Class
    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 3 months ago
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    Hi Sam,

    I guess so. if you want to be technical I suppose you need to think where your centre of gravity is, and where your centre of effort is from the sails etc.

    Are you going to cast the keel or make it up?

    Edward
    sam
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Edward

    Thanks - just one question, if your model is twice scale does this mean my tube should be about one inch behind the mast?

    I aim to complete the boat before testing the weight of ballast needed then like you, allocating most to the keel and some to 'trimming'

    Sam
    cenbeth
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Hi Samnewbie
    I have a Cariad which is wooden hulled at twice scale. I decided to use a false keel but as I bought the hull completed needed to retro-fit one. I agree with you! if you can fit the tube as early on as possible it will make life a bit easier. My keel needs to be about 12kg and the tube is a couple of inches behind the mast. I am still trying to cast the keel; I'm now on my fourth attempt!

    I have calculated the keel weight and plan on it being about 1kg lighter than need be. This will allow me to finely trim the boat up once complete.

    Good luck with yours.

    Edward
    1
    sam
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    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 11 hours ago
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    Hi everyone, just hoping someone still reads this blog. I am just about to start building Cariad and have decided to take advice from this blog, and fit a detachable keel. This is my second build and first fiberglass hull so being careful thinking it through.
    it makes sense to design in the detachable keel before fitting the deck but clearly I can only measure the ballast - weight and position - once the boat is nearly complete. So id welcome some idea of the position of the false keel so that I can fit a tube now, and build the keel itself later. Anyone able to advise?πŸ€”
    bellman1942
    Leading Seaman
    πŸ“ Brixham trawler IBEX
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 3 months ago
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    Many thanks everyonefor the various advice I`ve decided on a bulb fin keel, when requesting advice on keel weight I should have mentioned the hull is 42in lg this was an oversightπŸ˜‹, I`m now drg.shadows from the plan quite a laborious task but interesting.
    bellman
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