on 8/23/02 4:20 PM, Clive Smith wrote:
> > I did say, just be aware..... > and I think if you look back through the mails, you'll find it was me that > first suggested tufting! Maybe you did Clive, but I think I posted something along the same lines (yarn etc) back in 95-96. But what the heck.
> ...and if I spent my time sitting on my duff, I wouldn't know what you > obviously don't: that to a fly, the air's like treacle which is why they can > change direction and accelerate away from your swat quicker than you can > swing it. I do understand the concept that the Reynolds number serves to measure. And Clive, re-read your fly comments above, you might find an inconsistency or at least an interesting notion. No I can't resist...air is not like treacle to a fly. If it were when you dropped a dead fly it would take more than a few minutes to hit the floor. Well I know that is not true, seen flies drop, played with treacle. Or do you mean the fly's wings? I dunno, I guess you know what you mean. Try instead the interesting world of the microbe (if you have the wit). A bacterium of approx. 2 long and 1 micron in diameter swimming/flagellating through water is approx. like us swimming through warm asphalt. When it stops "swimming" it coast for a very/extremely small fraction of its body length, in essence stops dead immediately.
And why to a Pterordactyl or a hang glider the air appears > somewhat less sticky, and less thick too if you have the wit to imagine > being an airliner at 500 mph and 7 miles up. Gee, no, can't do that Clive, well out of the range of my feeble wit. > Thats what Reynolds No is about... Speed x Length /Viscosity - no units. > > and yes, NO relation, unless you run the tunnel at model scaled Re Nos. > and if you want to Make up your mind, relationship or not? >> ... at least visualise the flow around the van in a gross way... > > .. find a big smoky fire near a roadside and drive through it while a mate > on the roadside videos it. > ...or drive behind aVanagon thats burning oil or smoking bad (or use a smoke > cannister up front), and watch those Karman vortex wakes - most flat backed > vehicles have a very predictable flow pattern, the important thing is when > the flow suddenly changes its overall character, maybe 20, maybe 60 mph - > that is what Reynolds No determines. Did I say I wanted to see just vortexes at the rear? Well I guess you know best. > .. but I won't go on and explain further, as it appears you know what you > know and don't much want to know what you don't. Thanks again, such a benefit to have you on the list, now I know what I don't want to know. Alistair (I think, although maybe I don't know...but I do know this thread is dead for me) > > Clive > '88 Syncro Transporter |
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