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#21
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On or about Mon, 19 Jan 2004 09:28:37 +0000, Alan Lothian
allegedly uttered: In article , Keith Willshaw wrote: Hmmm, I suspect when dealing with a kg of water it makes a big difference to the fan blades if that water is frozen in a single lump. Indeed. Strange to relate, more windscreens are smashed by hailstones than by raindrops. Hailstones can get rather larger than raindrops. In the various updrafts within stormclouds the raindrops grow until they reach a size at which they're too unstable in the airflows and fission into smaller drops, hail just keeps growing until the updrafts can't keep them up. I've never been hurt by rainfall, but one short shower of 1" hail left me very battered, slightly dazed, and in need of a large drink and a quiet lie down. I'd be interested to know what experiments, if any, the programme did in order to reach its conclusions. Obviously they are quite correct about kinetic energy and momentum, but transfer of momentum operates in many different ways depending very much on the nature of the materials in which the transfer occurs. I have to admit I missed the show and will keep an eye out for the inevitable rerun as it would be one I'd like to see. --- Peter Kemp Life is short - Drink Faster |
#22
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"John Lansford" wrote in message news Ogden Johnson III wrote: Given the number of times the infamous "chicken cannon" has come up in these fora, your attention is directed to this [Sunday] evening's episode of "Mythbusters" on the Discovery cable channel [8:00 PM ET, repeated at 11:00 PM ET for the left coast] in which the intrepid Mythbusters team takes on the chicken cannon. I worked for a time at Arnold Air Force Station, Tennessee, where the USAF tests airframes, rockets and missiles in both scale and full size test cells. One of the tests involved firing chickens into windshields of aircraft at simulated flight speeds. The chicken gun exists. I've seen it in operation in fact. I live a few blocks from Boeing's chicken gun. No idea if they're using fresh or frozen. -- Zamboni |
#23
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"Zamboni" wrote in message ... "John Lansford" wrote in message news Ogden Johnson III wrote: Given the number of times the infamous "chicken cannon" has come up in these fora, your attention is directed to this [Sunday] evening's episode of "Mythbusters" on the Discovery cable channel [8:00 PM ET, repeated at 11:00 PM ET for the left coast] in which the intrepid Mythbusters team takes on the chicken cannon. I worked for a time at Arnold Air Force Station, Tennessee, where the USAF tests airframes, rockets and missiles in both scale and full size test cells. One of the tests involved firing chickens into windshields of aircraft at simulated flight speeds. The chicken gun exists. I've seen it in operation in fact. I live a few blocks from Boeing's chicken gun. No idea if they're using fresh or frozen. I live in Everett Wa near a fair size Boeing plant. Wonder if we have a gun locally? Jim E |
#24
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On Mon, 19 Jan 2004 17:52:01 -0500, Peter Kemp
peter_n_kempathotmaildotcom@ wrote: On or about Mon, 19 Jan 2004 09:28:37 +0000, Alan Lothian allegedly uttered: In article , Keith Willshaw wrote: Hmmm, I suspect when dealing with a kg of water it makes a big difference to the fan blades if that water is frozen in a single lump. Indeed. Strange to relate, more windscreens are smashed by hailstones than by raindrops. Hailstones can get rather larger than raindrops. In the various updrafts within stormclouds the raindrops grow until they reach a size at which they're too unstable in the airflows and fission into smaller drops, hail just keeps growing until the updrafts can't keep them up. I've never been hurt by rainfall, but one short shower of 1" hail left me very battered, slightly dazed, and in need of a large drink and a quiet lie down. Indeed. We had a hailstorm here (near Dallas, TX) last summer that was so loud I couldn't hear the baseball game on TV. When it stopped, I went outside & picked up some 2-1/2" dia. hailstones off my lawn! I can't imagine getting hit by one! JM |
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#26
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Peter Kemp wrote: On or about Mon, 19 Jan 2004 09:28:37 +0000, Alan Lothian allegedly uttered: In article , Keith Willshaw wrote: Hmmm, I suspect when dealing with a kg of water it makes a big difference to the fan blades if that water is frozen in a single lump. Indeed. Strange to relate, more windscreens are smashed by hailstones than by raindrops. Hailstones can get rather larger than raindrops. In the various updrafts within stormclouds the raindrops grow until they reach a size at which they're too unstable in the airflows and fission into smaller drops, hail just keeps growing until the updrafts can't keep them up. I've never been hurt by rainfall, but one short shower of 1" hail left me very battered, slightly dazed, and in need of a large drink and a quiet lie down. I'd be interested to know what experiments, if any, the programme did in order to reach its conclusions. Obviously they are quite correct about kinetic energy and momentum, but transfer of momentum operates in many different ways depending very much on the nature of the materials in which the transfer occurs. I have to admit I missed the show and will keep an eye out for the inevitable rerun as it would be one I'd like to see. --- Peter Kemp Life is short - Drink Faster There was a hailstorm in Texas several years ago during a large outdoor festival of some sort. Couple of folks maimed, lots hospitalized, millions of dollars in property damage. ( Broken glass, totaled cars, roof damage. ) --Dale |
#27
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"Dale Farmer" wrote in message
... SNIPPED There was a hailstorm in Texas several years ago during a large outdoor festival of some sort. Couple of folks maimed, lots hospitalized, millions of dollars in property damage. ( Broken glass, totaled cars, roof damage. ) IIRC, that was in Fort Worth during an outdoor Mayfest thing. __!_!__ Gizmo |
#28
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John Lansford wrote in message . ..
Jim Herring wrote: They're results were that a frozen chicken did no more damage than a room temperature chicken. They assumed a lot about impact damage with faulty data and testing. They should let me hit them with a frozen chicken and a thawed one and tell me which one hurt more. If you hit them at about 100 m/s I doubt they will be around to tell you which one hurt more. Dive into your swimming pool from the edge and then try hitting it at 400 mph and see if you feel a difference. Tis the velocity not the softness of the substance that hurts! As someone else pointed out, the frozen one is going to act like a solid mass, while the thawed one is going to "explode" and deform when hitting the windshield. At the speed of a modern fighter I doubt either case is going to leave one unscarred. I read somewhere that even if the plexiglass holds out the "wave" travelling through the canopy caused by the strike could seriously injure/incapacitate a pilot. |
#29
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Here's some bird and ice impacts for you.
One of my cadet classmates flying a Piper PA18 in primary at Hondo Texas hit a hawk - it came right through the windshield, alive and clawing. He wrung its neck and threw it into the rear. He still has a scar on his cheek. When I was at Homestead AFB 76-80 we had three buzzard strikes at Avon Park Range. Two hit the airframe and one hit the left quarter panel of the windshield. All strikes were when the F4s were doing 500K on low level weapons deliveries. The airframe strikes penetrated the fuselage skin around the intakes but no serious damage (other than a hole) was done. The windshield strike filled the cockpit with buzzard pieces and guts and disabled the front seater as most of the buzzard hit his shoulder. The rear seater was a pilot and landed the F4 at Avon park making an arrested engagement so the front seater could get immediate medical attention. He was dazed and his shoulder was severely bruised and he was half-nauseated from the buzzard guts but he recoverd quickly. A maintenance crew came up and repaired the F4 and another crew flew it back home. I was with Air Florida when one of our DC9s lunched an engine. 'Blue ice' from a leaking forward lavatory drain finally broke loose and the airflow carried it up over the wing and right into the engine intake. JT8Ds don't like large lumps of ice, regardless of color. BTW had anyone else noted the tabloids don;t carry stories about 'blue ice' from alien space any more? Walt BJ |
#30
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Here's some bird and ice impacts for you.
One of my cadet classmates flying a Piper PA18 in primary at Hondo Texas hit a hawk - it came right through the windshield, alive and clawing. He wrung its neck and threw it into the rear. He still has a scar on his cheek. When I was at Homestead AFB 76-80 we had three buzzard strikes at Avon Park Range. Two hit the airframe and one hit the left quarter panel of the windshield. All strikes were when the F4s were doing 500K on low level weapons deliveries. The airframe strikes penetrated the fuselage skin around the intakes but no serious damage (other than a hole) was done. The windshield strike filled the cockpit with buzzard pieces and guts and disabled the front seater as most of the buzzard hit his shoulder. The rear seater was a pilot and landed the F4 at Avon park making an arrested engagement so the front seater could get immediate medical attention. He was dazed and his shoulder was severely bruised and he was half-nauseated from the buzzard guts but he recoverd quickly. A maintenance crew came up and repaired the F4 and another crew flew it back home. I was with Air Florida when one of our DC9s lunched an engine. 'Blue ice' from a leaking forward lavatory drain finally broke loose and the airflow carried it up over the wing and right into the engine intake. JT8Ds don't like large lumps of ice, regardless of color. BTW had anyone else noted the tabloids don;t carry stories about 'blue ice' from alien space any more? Walt BJ |
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