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On Thu, 13 Nov 2003 10:26:44 -0700, Scott Ferrin
wrote: I don't know that this falls in the "friction" dept. but the stuff they've been finding out about gecko feet is pretty interesting. They've been using it to create Spidey-suits (my personal name for em), haven't they? I could see fun tactical uses for it, personally. |
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On Sun, 16 Nov 2003 17:48:33 -0500, John Penta
wrote: On Thu, 13 Nov 2003 10:26:44 -0700, Scott Ferrin wrote: I don't know that this falls in the "friction" dept. but the stuff they've been finding out about gecko feet is pretty interesting. They've been using it to create Spidey-suits (my personal name for em), haven't they? Well they'd like to but they still haven't figured out how geckos keep their feet clean :-) Think of the stuff they've played around with as very sticky tape. Not that it wouldn't have it's own uses but as it picks up dirt and dust and everything else it becomes less effective. I could see fun tactical uses for it, personally. |
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"Keith Willshaw" wrote:
"peter wezeman" wrote in message Is the coefficient of friction of those special tires that high, or do they use aerodynamic downforce to increase the traction? Both. If memory serves, the coefficient of friction of Formula One racing tires is on the order of 1.2, but of course a drag slick doesn't have to last nearly as long. One journalist wrote that, touching a racing tire at operating temperature, it feels sticky, about like wet bubble gum. They sit at the start and deliberately induce wheelspin to get the tyres good and hot, touch one of those tyres at racing temperature and you'll get a 3rd degree burn http://www.kagered-racing.com/images...02_burnout.jpg Keith The bottom line of automobile versus aircraft is that the piston engined automobile is faster through the first, say, quarter, but the advantage passes to the turbine-engined aircraft in the second quarter. It is a similar profile for turbine-engined drag cars versus piston-engined drag cars and the turbine-engined cars have the advantage over aircraft of being able to hold the engine on the brakes. I've seen photographs of Cobra 427 versus F-15 Jaguar XJR-8 versus Jaguar Don Garlits' Top-Fuel car versus F-14 I think this was 'staged', as Garlits did promotional work for the Navy, including photo-shoot of him doing burn-out runs on the decks of carriers. The photo-shoot with the F-14 was a problem as there was nowhere suitable to get the two pieces of machinery together (the F-14 had to be launched from a catapult) I think Garlits had to do a run on a section of concrete apron adjacent. The photograph of the Jaguars showed both in the same frame with the RAF version rotating. I am sure if I had read of a 'result' I would have remembered. Others events appear to have been:: Gilles Villeneuve in a Ferrari 126 CK beat an F-104 to 1000m circa 1981. Tazio Nuvolari in an Alfa Romeo 8C 2300 lost to a Caproni Ca100 (85hp De Haviland Gipsy 4 engine) circa 1931 in five laps of the Littorio racetrack outside Rome. Cat shots appear to take an F-14 to 150knots in approx two hundred and fifty feet. This place http://www.globalsecurity.org/milita.../lakehurst.htm has a catapult which can launch up to 185knots and also looks suitable as a testing ground. So it looks like the first 300 feet will take you to 185 knots in around two seconds. The narrative on the Streak Eagle launch told of how the ground-roll was comparable to a cat-shot and so it looks like the Streak Eagle is the aircraft best adapted to carry the colours into battle. Schumi versus Typhoon ended with Schumi beating the Typhoon in the 600m but losing out by 900m. The track was very wet which limited traction for the Ferrari. F2003-GA 600m=9.4s 900m=13.2s 1200m=16.7s Typhoon 600m=9.6s 900m=13.0s 1200m=14.2s The F2003-GA appears to have reached 294Kkm/h in the 600m and since the car has a maximum speed of approx 369Km/h it was mostly spent at this stage. The F1 car weighs around 600Kg and must produce around 850HP which would give around 1442HP/ton (not metric tonne). Others : Ferrari 550 Standing Mile: 30.9s 292HP/ton Ferrari 575 Standing Km: 22s with 300HP/ton McLaren F1 Standing Km: 19.6s with 560HP/ton Ferrari 512M with 764HP/ton Ferrari 712 Can-Am with 945HP/ton Porsche 917/30 with 1796HP/ton Top Fuel cars give approx 6250 HP/ton (six two five zero) Drag cars such as Pro-Gas can run the standing half mile without much adjustment, but I am not sure what it would take in final-drive gearing, aerodynamics and limits on tyre rpm to get a Top Fuel car to run a mile. But my guess is Bid Daddy would clean house. |
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