Guest Posted December 10, 2010 Share Posted December 10, 2010 see i told you all along time ago he was turning it into a proa. just need to chop the beams off the other side now. Quote Link to post Share on other sites
Atom Ant 0 Posted December 10, 2010 Share Posted December 10, 2010 Was driving past Okahu bay yesterday and saw the Tee Dubbyah sitting there minus amas. Looks kinda weird without em strapped on eh. Bet you're looking forward to the finished result eh Tim! Quote Link to post Share on other sites
TimW 1 Posted December 13, 2010 Share Posted December 13, 2010 Rudder Gudgeons. High density Foam is carboned over. Bearing is made from Orkot which glues well. then Carbon Unis over Bearing onto transom. Very strong, simple and cheap, and Bearings last for ages. Quote Link to post Share on other sites
Guest Posted December 13, 2010 Share Posted December 13, 2010 Very strong, simple and cheap, and Bearings last for ages. Yup, wish I had a dollar for every time I've heard that said by a multihull owner. Quote Link to post Share on other sites
ScottiE 174 Posted December 13, 2010 Share Posted December 13, 2010 High density Foam is carboned over. Tim - What's the reason for wrapping the carbon 'under' the bearing in that fashion - are you trying to resist forward thrust or just the bearing 'squashing' the foam in some situations. Does look very sexy though! A Quote Link to post Share on other sites
TimW 1 Posted December 13, 2010 Share Posted December 13, 2010 High density Foam is carboned over. Tim - What's the reason for wrapping the carbon 'under' the bearing in that fashion - are you trying to resist forward thrust or just the bearing 'squashing' the foam in some situations. Does look very sexy though! A To Stop the Orkot bearing from squashing into the HD foam. If there is no laminate on the HD, the Unis on the outside of the bearing are in peel if the foam starts to squash. The laminate spreads the load, and this way the carbon encapsulates the bearing. Fear not Pedro, I have used this system for a good many years now, the Orkot bearings last ages, and it is extremely reliable. Quote Link to post Share on other sites
TimW 1 Posted December 15, 2010 Share Posted December 15, 2010 Quote Link to post Share on other sites
Atom Ant 0 Posted December 15, 2010 Share Posted December 15, 2010 Very sexy! What are they? Curved foily things? Quote Link to post Share on other sites
Guest Posted December 15, 2010 Share Posted December 15, 2010 A contour map of Ireland? Quote Link to post Share on other sites
Guest Posted December 15, 2010 Share Posted December 15, 2010 Moulds for curved foily thingies? P and S. Very sexy. Quote Link to post Share on other sites
TimW 1 Posted December 15, 2010 Share Posted December 15, 2010 The plug for the curved foils. A female mould is laid up on the mdf plug. It is actually the top and the bottom, as the foils are assymmetric. Quote Link to post Share on other sites
Atom Ant 0 Posted December 15, 2010 Share Posted December 15, 2010 They look flash Tim. Are they cnc cut? Quote Link to post Share on other sites
TimW 1 Posted December 15, 2010 Share Posted December 15, 2010 They look flash Tim. Are they cnc cut? Yes. they need to be perfect to fit properly and slide easily in the bearings. as they are so assymetric it is vital that the windward one is lifted clear of the water. Quote Link to post Share on other sites
Atom Ant 0 Posted December 15, 2010 Share Posted December 15, 2010 Just imagine what would happen if they're both in the water at the same time - the beam would decrease! Quote Link to post Share on other sites
TimW 1 Posted December 16, 2010 Share Posted December 16, 2010 Last night we got the second ama joined together. Was a fantastic team effort, thank you very much to all the guys that helped. All remaining now on ama2 is to Laminate the outside, then fill and fair. Looking good to make Bay week ! Quote Link to post Share on other sites
TimW 1 Posted December 16, 2010 Share Posted December 16, 2010 since this drawing was done, we have made the foil angle less aggressive, as we were informed that BMW tried this style and ended up porpoising. i.e. too much lift and the whole foil comes up out of the water, cavitates, and back down you go, then once it bites again, back up you go etc.... At 15 knots our foil should provide around 350 kg of lift in its current configuration, if that is too much we will just have to pull it up, With such a big case we still have the opportunity to play around with all the various angles involved. Quote Link to post Share on other sites
TimW 1 Posted January 6, 2011 Share Posted January 6, 2011 The pictures show the beam sockets now Carboned in place and the holes at the ends of the sockets filled and carboned over. There are plinths where the various fittings will go along with those for the Inspection Ports. There is a Carbon fitting where the Topmast backstays attach along with the Tramp lashing tubes. Quote Link to post Share on other sites
Atom Ant 0 Posted January 7, 2011 Share Posted January 7, 2011 So what did you do in your holidays Tim Quote Link to post Share on other sites
samin 0 Posted January 9, 2011 Share Posted January 9, 2011 Hows progress on the port float? is it easier to fair the hull before putting the fittings on, (i.e. tramp tracks) then grinding the bog off, secondary bond, then re-fair the areas? or put all the fittings on then try bog and sand around them in one hit? or is it "6" one way 1/2 doz the other? so far iv done it one way on the main hull and the other on the beams, both ways seem a pain in the ass.... Quote Link to post Share on other sites
Guest Posted January 9, 2011 Share Posted January 9, 2011 not sure where to post this.....but thought here is as good as anywhere an interesting website with some interesting info on build times and costs and a cool time lapse video of building the main hull of an F-39 http://www.fram.nl/workshop/figures/timeandcosts.htm http://www.youtube.com/watch?v=HkrMDvW1wzk Quote Link to post Share on other sites
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