From: skunk-works-digest-owner@harbor.ecn.purdue.edu To: skunk-works-digest@harbor.ecn.purdue.edu Subject: Skunk Works Digest V3 #4 Reply-To: skunk-works-digest@harbor.ecn.purdue.edu Errors-To: skunk-works-digest-owner@harbor.ecn.purdue.edu Precedence: bulk Skunk Works Digest Saturday, 7 August 1993 Volume 03 : Number 004 In this issue: Re: SR-71 flight engineer forum at Osh 93 unsubscribe unsubscribe See the end of the digest for information on subscribing to the skunk-works or skunk-works-digest mailing lists and on how to retrieve back issues. ---------------------------------------------------------------------- From: rschnapp@metaflow.com (Russ Schnapp) Date: Fri, 6 Aug 93 09:56:25 PDT Subject: Re: SR-71 flight engineer forum at Osh 93 Thanks for the Oshkosh report, Sam. I have a couple of minor comments. > (TEB) > An aside on TEB: TEB is a pyro material that burns at 2000F, there > is enough carried to light the afterburner (AB) 16 times, it is > loaded through a panel located on the inside aft part of the engine > nacelle, each unstart results in a TEB shot to relight AB, an > unstart can result in engine damage According to the SR-71 Flight Reference Manual, the TEB shots are automatic. You get one shot when you move the throttle into the idle position, and another when you move it into afterburner. There is a resettable down-counter on each throttle, showing you how many shots you've got left. You start out with 16 shots per engine. > Fuel tanks are serviced with N2 for fire suppression, > note that running out of N2 will result in limiting the A/C speed to Mach=2.2 > due to heat build up in the fuel tanks. i.e., if you can't purge the fuel tanks with N2, then they'll have some O2 in there, and above M 2.2, the temperature can exceed the flash point. > - -Navigation is astro/inertial. The astro part is a star tracker that has a > catalog of 61 stars, can track 3 at the same time, and can update the inertial > system to .3nmi. The navigational system has 256 destinations, 256 fixed > points and 1023 control points. Note the buttons on the panels are 1 inch > square due to the size of the gloves worn by the crew. Imagine how much less weight a modern version of this aircraft would entail... That complex astro-inertial system has been made entirely obsolete by GPS. Presumably, one would use a ring-laser gyro updated by GPS. This would give greater accuracy at much less weight and complexity. F'rinstance, the astro tracker not only has to locate and track stars, but it also has to correct for shock wave refraction over its window. And then there are the engines, of course. ...Russ Schnapp Email: netcom!metaflow!rschnapp or rschnapp@Metaflow.com or rschnapp@BIX.com Metaflow Technologies Voice: 619/452-6608x230; FAX: 619/452-0401 La Jolla, California Unless otw specified, I`m speaking only for myself! ------------------------------ From: fjl@boboa.Jpl.Nasa.Gov (Frank Lagattuta) Date: Fri, 6 Aug 93 9:57:42 PDT Subject: unsubscribe unsubscribe - -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * [ * * Frank Lagattuta | |( * * fjl@boboa.jpl.nasa.gov --------------------- ___|__|____ * * |[][][][][][][][][][][| | TOPEX | * * |[][][][][][][][][][][|-| GPS Demo | * * "IIIIIII hates Rabbits." |[][][][][][][][][][][| | | * * -Yosemite Sam --------------------- |JPL | * * ----------- * * / \/ \ * * My opinions only . . . . * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ------------------------------ From: fjl@boboa.Jpl.Nasa.Gov (Frank Lagattuta) Date: Fri, 6 Aug 93 9:57:42 PDT Subject: unsubscribe unsubscribe - -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * [ * * Frank Lagattuta | |( * * fjl@boboa.jpl.nasa.gov --------------------- ___|__|____ * * |[][][][][][][][][][][| | TOPEX | * * |[][][][][][][][][][][|-| GPS Demo | * * "IIIIIII hates Rabbits." |[][][][][][][][][][][| | | * * -Yosemite Sam --------------------- |JPL | * * ----------- * * / \/ \ * * My opinions only . . . . * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ------------------------------ End of Skunk Works Digest V3 #4 ******************************* To subscribe to skunk-works-digest, send the command: subscribe skunk-works-digest in the body of a message to "listserv@harbor.ecn.purdue.edu". 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