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    Beefing up the insides for JSD

    You're the man! Will do.... B)
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    Beefing up the insides for JSD

    Yes, thank you, 'Z'.  I already have a 2' square plastic-covered 'table' I made up which clamps into a 'Workmate' portable bench ( https://www.youtube.com/watch?v=MtdblY_ChV8 ), which I've used effectively for smaller jobs. I think I'll make up a larger table to fit across the cockpit, rimmed...
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    Beefing up the insides for JSD

    I've caught myself reading chapters of the Machinery's Handbook 27th Edition during the last Lockdown. That syndrome probably has a name.....
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    Beefing up the insides for JSD

    I'll do 'zackly that, thanks, Zonker. You're a star! ( You don't do 'housecalls', do you? :rolleyes: ) I'll also grab a couple of those IR heat-lamps used in pig hatcheries/incubators to keep me warm while the glue goes off.
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    Beefing up the insides for JSD

    I've followed up on Evans' helpful pointer to FLiNK Ltd, and had a lengthy 'consult' with Julian S. their top specialist. He certainly has the background and the 'hands on'.... or pro CV.... and understood exactly the objectives and the constraints. He endorsed much of what was raised here/above...
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    Beefing up the insides for JSD

    I haven't gone away. I'm listening hard.... ....and reading hard, too. And please don't worry about Imperial Measures - I'm bilingual, and drink local beer in pints! One supplier of GFRP product is  East Coast Fibreglass UK E-Glass Quad S-Glass Carbon
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    Beefing up the insides for JSD

    Damn! Back to the drawing board.... :angry:
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    Beefing up the insides for JSD

    I'm grateful again to 'Zonker'. Substituting for my 4 BUMAX88 bolts, I note ~18608kg/40937lbf, which should be 'quite sufficient'. I hope.... "Minimum specification for BUMAX 88 is a tensile strength of min. 800 MPa and a yield strength of min. 640 MPa. However, in reality BUMAX 88 counter-sunk...
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    Beefing up the insides for JSD

    That's a pleasing video by James/'atomvoyager' which illustrates several facets with clarity. His boat is of similar size/displacement to mine. I found myself stopping/rewinding at several points, which I'll offer up for comment. He chose to use 5/16 or ~8mm dyneema. I purchased 10mm, not...
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    Beefing up the insides for JSD

    I'll explore that. It would be easier to do now, as the boat is 'high and dry'. An insurance surveyor will want to poke about in there, anyway, and if I can show evidence of 'enhancement' s/he probably won't poke any further.
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    Beefing up the insides for JSD

    You wouldn't believe the internet and YouTube 'rabbit holes' I've been down, looking for illumination, resolution and perhaps absolution. Then I found this....
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    Beefing up the insides for JSD

    All this is much appreciated, people. I misspent much of my innocent youth with my tender pink little bottom strapped to an ejector seat. I didn't ever need to deploy the thing, despite coming darn'd close on occasion. "When all else fails, put your trust in God and Martin-Baker" I view the...
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    Beefing up the insides for JSD

    I'm quite happy to introduce a 'structural fillet' around the inside corners. That's easily done by wrapping some of the layers of cloth round/into the corners. Aircraft engineer Don Jordan recommends the optimum 'throat angle' of the bridle arms is about 20 degrees - or 10 degrees either side...
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    Beefing up the insides for JSD

    Thanks for that..... :rolleyes:
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    Beefing up the insides for JSD

    It's not a cored layup, Captain Ahab, but thanks. As I stated, it is 'grp'..... Conventional practice, if there is such a thing, is to take a strap ( or two ) of stainless, drill a number of holes in them, and bolt them with some gunk to the quarters. There's no known relevant 'composites...
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    Beefing up the insides for JSD

    Thanks for the above. I've had lots of spare time these past two years to research. I've studied everything anyone has written on JSDs - including all Don Jordan's original material - I've scoured the forums and website comments, and I've spoken with all those individuals I could access who'd...
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    Beefing up the insides for JSD

    I'm planning to fit titanium pad eyes to the quarters of my small sailboat, to take the bridle-arms of a JSD. I reckon the laden 'mid-weight' will not exceed 9000lb, so Don Jordan's calculation of 'Design Loads' for rode and bridle arms at 7200lb and 5040lb each should be readily achievable...
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