Guest ozzie Posted January 9, 2011 Share Posted January 9, 2011 The affect of drag on different shapes. Link to comment Share on other sites More sharing options...
Guest Maj Millard Posted January 9, 2011 Share Posted January 9, 2011 Very enlightning Ozzie, I really enjoyed that !.From a lot of old books that I have read, apparantly one wire behind another has even less drag than one alone......................thanks, Ross Link to comment Share on other sites More sharing options...
facthunter Posted January 10, 2011 Share Posted January 10, 2011 yes ..It's good. The variations are more than you would expect in some instances. It's well demonstrated. Ta... Nev Link to comment Share on other sites More sharing options...
Old Koreelah Posted January 10, 2011 Share Posted January 10, 2011 Fascinating stuff. We have a lot to thank the early researchers for, especially NACA for sharing their findings. I believe fair dinkum racing cyclists use aerofoil-shaped spokes! Link to comment Share on other sites More sharing options...
Guest ozzie Posted January 10, 2011 Share Posted January 10, 2011 The video jogged an old memory from back in the early hang gliding days. ('76) our little group was sittting on the hill at Stanwell Tops with a cold southerly howling in and the conversation came up on drag from tubes on the exposed 2 inch dia crossbars. We removed one and took turns standing thereon the edge of the hill holding the tube into the wind and feeling the effect of the drag pushing backward, noticing the increased effect during the gusts. Wind was 20 to 25 mph on the old Hall meter. I think that this was probably the first time that any of us really put a bit of thought into just how much drag there was in a bit of tube. Further experimentation was conducted (over Bulga Dan's burgers and apple pie) with various sized fairings made from cardboard and tape. Fun educational days. Ozzie Link to comment Share on other sites More sharing options...
eastmeg2 Posted January 10, 2011 Share Posted January 10, 2011 Fascinating stuff. We have a lot to thank the early researchers for, especially NACA for sharing their findings. I believe fair dinkum racing cyclists use aerofoil-shaped spokes! And tear-drop shaped heads - I mean helmets . . . Link to comment Share on other sites More sharing options...
Old Koreelah Posted January 11, 2011 Share Posted January 11, 2011 And tear-drop shaped heads - I mean helmets . . . With our intense sporting competition, perhaps evolution will eventually favour the aerodynamic skull... Link to comment Share on other sites More sharing options...
sseeker Posted January 12, 2011 Share Posted January 12, 2011 One thing I don't understand is wire has a drag force of 1.1 when the aerofoil has a drag force of 1.0, if you stuck an aerofoil around the wire it'd have a drag force of 1.0 right? So that's hardly improving the efficiency unless you had a lot of wire? Or was he saying that the aerofoil was bigger than the piece of wire (in surface area) yet was more aerodynamic? -Andrew Link to comment Share on other sites More sharing options...
Ultralights Posted January 12, 2011 Share Posted January 12, 2011 Or was he saying that the aerofoil was bigger than the piece of wire (in surface area) yet was more aerodynamic? correct. Link to comment Share on other sites More sharing options...
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