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#11
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"Mary Shafer" wrote in message ... snip Dryden isn't an AFB; it's NASA and is a tenant at Edwards AFB, which (obviously) belongs to the USAF. How do you like the new 58? |
#12
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Uzytkownik "Mary Shafer" napisal w wiadomosci ... On Wed, 22 Oct 2003 23:46:57 +0200, "JasiekS" wrote: Uzytkownik "Mary Shafer" napisal w wiadomosci ... He didn't think the fly over was that impressive and, seeing the video and having seen a previous Mach 3.2 fly over with fuel dump, I kind of agree. He has the take off, too. Sorry, Mary, but what is the elevation of said NASA/Dryden AFB? As I recall your posts SR-71 is SUBSONIC up to 10k ft or so. No one said it wasn't. The fly overs at Mach 3+ were made at altitude, not on the (2400-ft MSL) deck. OK! I understand this. I've just imagined for the moment effect of low level Mach 3+ overflight (IF structural limits allowed...). Mighty god! That's why they dump fuel when exactly overhead, so you can see them. Well, and so you can time how long it takes the boom to reach the surface, too, except that you don't actually hear the boom from when it's overhead but from when it's on down the flight track. At Mach 3 cone half-angle of the shock wave should be approx. 19.5 deg. Let we assume 10k ft for the flight level. In such circumstances I should hear boom when the aircraft would be 28k ft away. Right? Dryden isn't an AFB; it's NASA and is a tenant at Edwards AFB, which (obviously) belongs to the USAF. Mary -- Mary Shafer Retired aerospace research engineer JasiekS Warsaw, Poland |
#13
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On Fri, 24 Oct 2003 00:01:56 +0200, "JasiekS"
wrote: That's why they dump fuel when exactly overhead, so you can see them. Well, and so you can time how long it takes the boom to reach the surface, too, except that you don't actually hear the boom from when it's overhead but from when it's on down the flight track. At Mach 3 cone half-angle of the shock wave should be approx. 19.5 deg. Let we assume 10k ft for the flight level. In such circumstances I should hear boom when the aircraft would be 28k ft away. Right? Try 85,000 ft, not 10,000. Mary -- Mary Shafer Retired aerospace research engineer |
#14
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Mary Shafer wrote in
news On Fri, 24 Oct 2003 00:01:56 +0200, "JasiekS" wrote: That's why they dump fuel when exactly overhead, so you can see them. Well, and so you can time how long it takes the boom to reach the surface, too, except that you don't actually hear the boom from when it's overhead but from when it's on down the flight track. At Mach 3 cone half-angle of the shock wave should be approx. 19.5 deg. Let we assume 10k ft for the flight level. In such circumstances I should hear boom when the aircraft would be 28k ft away. Right? Try 85,000 ft, not 10,000. Honest newbie question: can you see much of anything with the unaided eye, or non-fancy binoculars? -- Jim Battista A noble spirit embiggens the smallest man. |
#15
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On Fri, 24 Oct 2003 02:14:48 -0000, Jim Battista
wrote: Mary Shafer wrote in news On Fri, 24 Oct 2003 00:01:56 +0200, "JasiekS" wrote: That's why they dump fuel when exactly overhead, so you can see them. Well, and so you can time how long it takes the boom to reach the surface, too, except that you don't actually hear the boom from when it's overhead but from when it's on down the flight track. At Mach 3 cone half-angle of the shock wave should be approx. 19.5 deg. Let we assume 10k ft for the flight level. In such circumstances I should hear boom when the aircraft would be 28k ft away. Right? Try 85,000 ft, not 10,000. Honest newbie question: can you see much of anything with the unaided eye, or non-fancy binoculars? Sure. The plume of fuel that's being dumped and, maybe, a dark spot at the head of the plume. On a clear day. If you're very keen-eyed. Or imaginative. Seriously, you could see the fuel plume and I think you could see the aircraft planform in the LRO (Long-Range Optics) views, rather grainy and fuzzy, or with very strong binoculars when it was close to the facility, although I never tried with binoculars. There may well have been a bit of seeing an SR-71 shape because we knew it was an SR-71, too. The fuel plume looks a bit like a loose contrail, by the way. Mary -- Mary Shafer Retired aerospace research engineer |
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