DrWatson 374 Posted February 15, 2017 Share Posted February 15, 2017 Any one got any idea on what it would cost to mill a foil? I mean general ballpark figure. Of course there are likely to be a bunch of factors (milling resolution/steps, kind of steel etc.) so I guess it's a bit of a "how long is a pice of string" question. But lets say a 2.5 m long blade about 600-700mm chord, reasonably standard NACA foil shape, with a 600mm long keel root and to take a 1200kg bulb. Once you all get over laughing at my naïvety, any figure +- 3K would be good. Quote Link to post Share on other sites
ScottiE 174 Posted February 15, 2017 Share Posted February 15, 2017 Might be "more cost effective" to have it 3D printed out of titanium! Quote Link to post Share on other sites
DrWatson 374 Posted February 19, 2017 Author Share Posted February 19, 2017 OK, I was mainly interested in it to ease production of the keel. Did a few calcs, however, and need to think again. Don't think what I was considering will work cause would leave too much weight in the foil. Necessitating a deeper foil or larger bulb to get the right righting moment. TimB, if you're out there, who designed this and the new floor arrangement? I assume the foil is thick walled box section (not solid) and then faired? Quote Link to post Share on other sites
MasterOfDisaster 0 Posted February 19, 2017 Share Posted February 19, 2017 Might be "more cost effective" to have it 3D printed out of titanium! I understand there are a few places in NZ who can print titanium now. 90% of the regular strength. I doubt they're cheaper than milling though. Quote Link to post Share on other sites
TimB 7 Posted February 20, 2017 Share Posted February 20, 2017 DR W. The foil is solid bar stock made from Bisalloy 80, a high strength carbon steel. The central piece goes full length with other pieces welded onto the side to give a rough foil shape. Stu got the "design" from someone in Auckland but it stopped at the plate attached to the hull (which was only 16mm thick I think).. I convinced Stu to extend the tongue up inside the boat. The floor design was basically intended to spread the loads from that tongue into the boat structure and avoiding any concentrations. I describe it this way ... compare holding on to the end of a broomstick by one finger and thumb to holding the end in your entire fist..... Cheers Tb Quote Link to post Share on other sites
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