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randii

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  1. So that's 160x120 actual, with 3.32mm wall thickness. Is there any sleeving? Randii
  2. CX is good stuff. There are various formulations, but the HD mix is probably best for open-exposure ocean use. http://www.corrosionx.com/corrosionx-products.html I'm not sure how well any of these films hold up to open weathering. Some kind of end cap might help? Any idea on the thickness of your extrusion. Freedom? I'm going to play with Beam Boy a bit: http://www.geocities.ws/richgetze/. That's a good bit further towards the deep end of the engineering pool than I usually wander, but nothing ventured, nothing gained... There's at least some partial consensus that the crossbeams we
  3. Martin, my T9 does indeed have the shorter ‘bury’ on the main crossbeam hull socket (improved access forward vs. less engagement with the ring frame)... and Tennant's floating mastbase/dolphin-striker. The forward and aft beams hold this boat together, since the main and mid beams aren't affixed to the hulls (at least before the rig is tensioned). I have looked at your slick composite beams, but hope to keep in much simpler (as my composite skills are MUCH more basic!). Thanks for breaking down the loads... I was not visualizing them all. It really underlines how involved multihull crossbeams
  4. I'm providing the info from the study plans for reference. I'm working my way across the web trying to identify the extrusions I have so that I can compare them to what Tennant specified. The GBE study plans list the crossbeams twice, once in the Fitting List (FWD 100mm, MAIN D15, MID 100mm, AFT D15) …and another with greater specificity under Aluminum Extrusions. They don’t exactly match, but still have value in context. - FWD: round, 88.9mm x 88.9mm (weight/m: 1.85kg) - MAIN: ellipse, 152.4mm x 114mm (weight/m: 3.43kg), D15 - MID: ellipse, 133.4mm x 100mm (weight/m: 2.77kg) - AFT: ellips
  5. I measured my crossbeams and wall thicknesses today. There's substantial variance in the wall thickness, some attributable to the forming process, and some likely a result of dings and age. Accordingly, I'm listing estimated average (min, max) and notes: - FWD: NG-37 egg shape, 170mm x 115mm x 4mm (3.74mm, 5.45mm) - MAIN: ellipse shape, 178mm x 110mm x 4mm (3.6mm, 6.1mm) - MID: flattened oval shape, 127mm x 83mm x 3mm (2.52mm, 4.1mm) - AFT: ellipse shape, 178mm x 110mm x 3.5mm (3.1mm, 4.65mm) My main and aft beams appear to be formed from the same die… that will be handy if I need to sleev
  6. Thanks, Tim... that seems eminently possible at launch or a few years back (the boat was first registered in '84). With 34 years intervening and 4 different extrusions, I suspect finding matching extrusions will be challenging. I'll search, but I may also need to prepare a Plan B, and at first glance, that looks like a composite insert. Randii
  7. I checked, and there is no sleeving inside my T9 crossbeams. I've googled a bit with respect to what's involved with that... since my beams are oval or egg sections, there's no perfect 'stock' section available to insert. Short of having a Naval Architecture spec it out, is there any sort of best practice that's been done for the existing GBE fleet? Seems like the beam would receive highest loads at the inner-most hull/beam interface/connection/clamp and taper either direction along the beam from there. As noted above, I don't think this boat has been sailed very hard very often, so failur
  8. I'm not entirely certain on what is sealed and what is not, since the boat is PPG-painted entirely on the outside and mostly on the inside, but I believe her to be epoxy-laminated and epoxy-sealed on the outer skin. She's finished clear on much of the exposed Okoume strip-walls below, with some painted surfaces between the main and mid-beam. I'm not sure how to differentiate varnish and epoxy inside? Daggers are ripped/flipped/laminated wood -- likely cedar. The previous owner stripped the side of one of them in an effort to squeeze past a jam in the starboard dagger well, so I can see thr
  9. I had some difficulty starting an account, but the administrators and programmers fixed whatever was wrong, so here I am! I appreciate their efforts. After years of beach cat experience, I have been looking for something a bit larger. Ian Farrier's work has impressed me for years, but I really like catamarans. After a summer of searching, I got hooked on the look and feel of Malcolm Tennant's boats, of which there aren't a ton in North America. I did some travelling to visit a few boats, and a Turissimo 9 followed me home on a trailer. 3000 miles, an international border, and a bunch of s
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