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General control line discussion => Open Forum => Topic started by: Tim Wescott on September 08, 2015, 10:35:39 AM
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Howard, Brett, does this make sense to you?
http://www.liveleak.com/view?i=f95_1422455171 (http://www.liveleak.com/view?i=f95_1422455171)
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I've heard of it being done.
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I've heard of it being done.
Oops -- I mis-coded the link. My post should make more sense now.
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This same identical script was used to describe the inertial navigation system in the 1011 when I worked at the old lazy L.
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In the late 60s early 70s we put the TOW missile system on Army Cobra (AH1G) attack helicopters. The Tube Launched, Optically guided, Wire command link missile had a "secret frequency" IR source in its ass end.
The pilot tried to keep cross hairs of his sight centered on the target from a moving helicopter (generally they hovered for the anti tank shot...but a good front seat guy could do it on the move)
The Telescopic site unit on the nose of the AH1 had a sensor for the "secret frequency" IR source and had three fields of view progressively getting narrower as time of flight increased. On Board the Cobra were sensors relating to the attitude, speed, and direction of the aircraft. In the tail boom we had several antiquated analog computers that took the data about the aircraft, and deviation of the IR source relative to the optical Cross hairs on the target and sent up, down , left, right commands to the missile
The missile, once fired, went forward a few micro seconds and deliberately jinked left or right to get directly in front of the helicopter hoping the system would detect the IR source and start the communications..Sometimes I would see the missile hunt back and forth, and up and down trying to get this link established...if failed, it would just fly to max range , wire cut, and detonate
I was an 68J Aircraft Armament Repair Specialist at the time and they sent me to school for the air craft TOW system (yes Virginia I was an in flight missile repairman)
As in all Army schools, the instructors loved to play films to fill their required "podium time". My memory is these films had many different views of Ground TOW- how it worked, and early experiments on UH1B Hueys, and some other rather one of a kind installations of the TOW Missile system.
One particular film we watched had the EXACT same soundtrack as Tim posted above
Edited in.... The sound track above was a sarcastic spoof from some group of instructors at Anniston Army Depot around 1975.
They were supposed to teach Enlisted men (E-3s and E-4s) how to trouble shoot and repair the three black boxes in the tail boom. The Rocket scientists who wrote the theory of operation for the TOW system did in in only 37 pages with a LOT of Rho Delta Rho computer description, offset geometry, boolean logic, and heavy with high order math, physics, and still more analog computer logic. There was no way a high school grad (most of us had GEDs) could understand that section of the instruction (The E6 SSG and E-7 SFC instructors did not understand it)
I wish I still had the Tech Manual I bet Bret and Howard would look it over and ask....so whats your question soldier?
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Speaking as a control systems designer, I can say that at least the first half of that soundtrack is 100% true, and 100% useless. They threw in some extra jargon in the 2nd half that made it not quite true -- but it's still close, and still useless.
It can be exceedingly difficult to write decent instructions for that sort of thing, even if you're writing for engineers with the same technical chops but no experience in the system involved. Basically, you get so close to the problem that you don't realize what people don't know.
Good instructions for that sort of thing are written for a test audience, and you don't stop until you can make it all understood. What works best is to have the engineering team teach the in-house field service techs how to repair the system, and then the service techs write the manual with or without input from the engineering team. I've been there, done that, on both successes and failures.
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This, I think, is an example of a joke aimed at a person who wouldn't think it's funny. I do this all the time around my house.
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This, I think, is an example of a joke aimed at a person who wouldn't think it's funny. I do this all the time around my house.
Me too! Fun isn't it! LL~ LL~ LL~ LL~
Jerry
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Speaking as a control systems designer, I can say that at least the first half of that soundtrack is 100% true, and 100% useless.
This reminds me of the story of a pilot lost in fog. He sees someone below, cuts his engine and asks, "Where am I." He receives the response, "You're in an airplane." Having gotten an answer that is true but useless, the pilot knows that he is over the Boeing customer services building, which he knows to be 1/4 mile southwest of Boeing Field, so he is able to land safely.
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This reminds me of the story of a pilot lost in fog. He sees someone below, cuts his engine and asks, "Where am I." He receives the response, "You're in an airplane." Having gotten an answer that is true but useless, the pilot knows that he is over the Boeing customer services building, which he knows to be 1/4 mile southwest of Boeing Field, so he is able to land safely.
http://www.wanderings.net/notebook/Main/EngineerManagerHotAirBalloon (http://www.wanderings.net/notebook/Main/EngineerManagerHotAirBalloon)
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In the late 60s early 70s we put the TOW missile system on Army Cobra (AH1G) attack helicopters. The Tube Launched, Optically guided, Wire command link missile had a "secret frequency" IR source in its ass end.
The pilot tried to keep cross hairs of his sight centered on the target from a moving helicopter (generally they hovered for the anti tank shot...but a good front seat guy could do it on the move)
The Telescopic site unit on the nose of the AH1 had a sensor for the "secret frequency" IR source and had three fields of view progressively getting narrower as time of flight increased. On Board the Cobra were sensors relating to the attitude, speed, and direction of the aircraft. In the tail boom we had several antiquated analog computers that took the data about the aircraft, and deviation of the IR source relative to the optical Cross hairs on the target and sent up, down , left, right commands to the missile
The missile, once fired, went forward a few micro seconds and deliberately jinked left or right to get directly in front of the helicopter hoping the system would detect the IR source and start the communications..Sometimes I would see the missile hunt back and forth, and up and down trying to get this link established...if failed, it would just fly to max range , wire cut, and detonate
I was an 68J Aircraft Armament Repair Specialist at the time and they sent me to school for the air craft TOW system (yes Virginia I was an in flight missile repairman)
As in all Army schools, the instructors loved to play films to fill their required "podium time". My memory is these films had many different views of Ground TOW- how it worked, and early experiments on UH1B Hueys, and some other rather one of a kind installations of the TOW Missile system.
One particular film we watched had the EXACT same soundtrack as Tim posted above
Edited in.... The sound track above was a sarcastic spoof from some group of instructors at Anniston Army Depot around 1975.
They were supposed to teach Enlisted men (E-3s and E-4s) how to trouble shoot and repair the three black boxes in the tail boom. The Rocket scientists who wrote the theory of operation for the TOW system did in in only 37 pages with a LOT of Rho Delta Rho computer description, offset geometry, boolean logic, and heavy with high order math, physics, and still more analog computer logic. There was no way a high school grad (most of us had GEDs) could understand that section of the instruction (The E6 SSG and E-7 SFC instructors did not understand it)
I wish I still had the Tech Manual I bet Bret and Howard would look it over and ask....so whats your question soldier?
My sister worked on Cobra TOW systems,, LOL,, hard for me to imagine her in that enviroment,, but,, well, Army wisdom,, she signed up to be a "fire control specialist",, she thought that meant a fireman,, like to put out fires LOL< whoops
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Tim,
Sounds like "who's on first and what's on second"; but that was before your time.
Rex
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Tim,
Sounds like "who's on first and what's on second"; but that was before your time.
Rex
Oh! He's our shortstop!
Some classics survive through the ages.
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Reminds of some of the training films that The U.S. Army had us watch ( all of you served , correct?) ..... best sleeping pill I ever had.
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Howard, Brett, does this make sense to you?
http://www.liveleak.com/view?i=f95_1422455171 (http://www.liveleak.com/view?i=f95_1422455171)
No.
Brett
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Another classic
[youtube=425,350]https://www.youtube.com/watch?v=Ac7G7xOG2Ag[/youtube]
A more modern spin
[youtube=425,350]https://www.youtube.com/watch?v=RXJKdh1KZ0w[/youtube]
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Thanks for posting. I laughed out loud. I work in a cube with some industrial engineers who save stuff like this. One of the best ones is a project involving 7 lines that are all completely perpendicular to each other.
This makes me almost look forward to work tomorrow.