catbirdseat Posted March 1, 2004 Share Posted March 1, 2004 how thick the wall is has nothing to do with it huh? It probably does. So I presume that wall thickness of the BD narrower at the teeth than the OP? If so, this isn't something anyone could just change easily. Quote Link to comment Share on other sites More sharing options...
Ryan Posted March 2, 2004 Author Share Posted March 2, 2004 There's something with the BD screws where the diameter of the screw right at the tip of the screw is micrometers smaller than the rest of the diameter so there is very little resistance when placing the screw...just what I've been told. Quote Link to comment Share on other sites More sharing options...
snoboy Posted March 2, 2004 Share Posted March 2, 2004 Actually I think the tips are slightly larger so that the rest of the screw has an easier time going on the hole. Quote Link to comment Share on other sites More sharing options...
fern Posted March 3, 2004 Share Posted March 3, 2004 they're tapered so that the hanger end is larger diameter than the tip so that the ice core gets pushed out easier. Smiley screws are larger diameter than BD screws, which is nice when you can draft old screw holes on popular climbs. Â it is always fun to read about BD voodoo that makes their gear so much better and more special than any other gear. They sure are good at marketing! Quote Link to comment Share on other sites More sharing options...
snoboy Posted March 3, 2004 Share Posted March 3, 2004 Ahh yes, ID vs OD. Oops. fern is right of course. Quote Link to comment Share on other sites More sharing options...
Thinker Posted March 3, 2004 Share Posted March 3, 2004 Ahh yes, ID vs OD. Oops. fern is right of course. Â you may BOTH be right. I can't find much info on the dual (or duel) taper, but it's possible it could work both ways if the wall thickness decreases from front to back. Â from http://www.escape2.co.uk/acatalog/Winter_accessories.html: Black Diamond Turbo Express Ice Screw Arguably the fastest placing ice screw on the market, allowing you to make better placements and get moving again before getting pumped out. Their patent-pending duel-taper design means that the head cuts a bigger hole than the diameter of the tube, reducing friction on the tube to nearly zero. Machined from high quality CrMo steel and heat-treated, the screws have exceptionally smooth surfaces inside and out. The teeth are extremely sharp, and are milled so the cutting surfaces angles inward, pushing the ice chips inside the screw to reduce friction on the outside. Quote Link to comment Share on other sites More sharing options...
Ryan Posted March 3, 2004 Author Share Posted March 3, 2004 Ahh, right, I can't think today. Snoboy's got it right...my bad. Quote Link to comment Share on other sites More sharing options...
catbirdseat Posted March 3, 2004 Share Posted March 3, 2004 Dual means two. Duel is something you might do using pistols. Quote Link to comment Share on other sites More sharing options...
Thinker Posted March 3, 2004 Share Posted March 3, 2004 I simply cut and paste the text from the British website. Do you suppose it's another case of the Brits spelling something slightly different than us? Quote Link to comment Share on other sites More sharing options...
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