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  1. We bought us an XX rig from Ovington in december because they sold them off dead cheap, but as of now they aren't on their website anymore. Getting the whole shebang over the channel, through Brexit and Covid and into real Europe wasn't simple and took quite some time. Turns out, someone forgot to put the wires into the package. Got a quick and very friendly reaction from them and a parcel much later (not their fault, see above), but main and lower shrouds are still missing. I'm hoping for another reaction on monday...
  2. That would be awfully nice, the name may already be enough... Any ideas ?
  3. I'd make the sleeves out of some unbreakable plastic. Hard PVC (the grey stuff) ist easy to work, largely good enough for your purpose and no corrosion.
  4. Ok, can't wait to see how it's done one the XX carbon mast. Julian, it seems there isn't much literature on the XX. The only thing Ovington could dig up for me is the fitting guide for the gunwhale extensions. Is there a rigging guide or something ? Trial and error is fun, but life is short, so any help from you on that one would be great...
  5. Gee, the significance of the number of threads that are really bearing the load didn't cross my mind until now, thanks. Well, 20tpi equals 1 thread per 1.27mm or less than 2.5 threads in the 3mm sleeve. To keep the same load on every thread as in your 10 threads, this would mean the torque has to be reduced by the same factor of 2.5/10 = 0.25 ? That's not much torque left... Ok, but since the (shear) load should be on the csk head now, rather than on the threads of the four other bolts, it's propably acceptable to torque them a little less. BTW I still wonder why ffs the axial load b
  6. Hello guys, me thinks it's about time I report back on what's happened to my mast joint fiddling since the last six months. I hope I can piece the details together from memory... Stuff: Ovington sent me a nice piece of mast tubing with a 3mm wall thickness which is already a good thing because the old one was only 2mm, I swear. I cut it in half, so now I have a spare as well. I got UNC 1/4-20 SS bolts, raised head for the four spreader holes and csk heads for the two new holes plus a tap for the thread. I would have liked to find bolts with torx heads but could only
  7. Update on the mast issue: As far as the material for the sleeve goes, Ovington is finally able to provide me with a piece of mast tube, should be here in a week. (Shame I couldn't find a wrecked Laser lower mast as it should have the correct dimensions.) I like the idea of using coarse threaded bolts, but BSW is really hard to come by nowadays, so I have opted for 1/4"-20 UNC stuff. Since I have to make six new holes/threads in the new sleeve I might as well enlarge the existing holes in the spreader and mast parts a little and use UNC bolts everywhere, csk in the additional two hole
  8. Amazing work ! Out of curiosity: what is the weight of the stripped down hull ?
  9. Thank you for the detailed numbers ! If I did the math correctly the mast/mainsail combo plus s&h must be in the range of £3000, based on the current prices on the Ovington website. That's quite an amount of money when compared to the value of a decent used boat. On the other hand, if someone has to replace a mainsail and/or the mast the extra cost is pretty small. For the top sailors this shouldn't be much of an issue if they are to buy new hardware sooner or later anyway. The mid level people would probably be not very enthusiastic about it. Anyway, since it's a one-time transi
  10. So... How much should we expect to shell out for the carbon mast and a set of sails ?
  11. Probably the dynamics in the 29er class are a bit different than in the 49er because it is mainly sailed by kids who don't spend too many years in the boat. Thus the long-term investment for the carbon mast doesn't hold as much attraction for them ? I have explained the whole issue to Barry Johnson. Hope it's ok with the rules...
  12. Despite not being an engineer, I'll try to add my 2cts while I try to learn a little. As far I as was able to recalculate, the red and blue areas are each half the surface around the corresponding 1.7mm parts of the bolt. The sin rule applies, because the surfaces are inclined with regard to the direction of the shear load. For BSW bolts it's sin 27,5° = 0.46 on the thread. The 'effective' surface of red vs blue is thus: 29.3 vs 11.9mm^2 which is more than the double. But shouldn't one rather compare the surface of the conical part of the csk head *below* the red one with the blue on
  13. Thank you for the calculations, the results a pretty clear ! I already have my hands on a 1/4" BSW tap. Finding the csk stainless BSW bolts w/allen or torx head (vs Phillips or PZ) might take some time, but they'll show up eventually. Any reason to csk the heads of the existing 4 bolts ? I dont think so because they won't go much farther down than the thickness of the spreader's material and this can't be of much use, right ? I'll report back what the 29er office says on the topic.
  14. I am sorry if I have to get back to you yet another time: I am wondering how far into the mast I should coutersink the heads ? I am inclined to think that it would be best to sink them all through the thickness of the mast parts:
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