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#1
October 21st 04, 11:45 PM
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On Wed, 20 Oct 2004 at 14:31:01 in message
, Joe Morris wrote: A friend of mine was one of the design engineers for the 747; he has a film of some of the certification test flights -- including abused takeoffs where intentional overrotation caused the tail to contact the runway surface...and at gross weight (IIRC) it successfully completed the takeoff. I think you will find that is a standard test to check the 'Velocity Minimum Unstick' speed. A large block of wood (Usually Oak) is fastened to the tail bumper to protect the airframe. It is not abuse but a careful test at the Maximum practical rotation. Unless the tail has been definitely touching for about the last 500 ft of the ground run the test is not accurate. For a description of this test see "21st Century Jet" by Karl Sabbach regarding the Boeing 777. -- David CL Francis 
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#2
October 23rd 04, 04:04 PM
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"Nathan Young" wrote in message with 6000 feet of runway left, fully loaded with fuel and cargo for a flight from Halifax to Spain. Can the 747 really do that? No. Not at gross.
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#3
October 24th 04, 01:36 AM
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News today on the data box...
I "heard" rotation occoured at 50 mph less than rotation speed.. ....more when I get more... Dave On Sat, 23 Oct 2004 11:04:01 -0400, "John Gaquin" wrote: "Nathan Young" wrote in message with 6000 feet of runway left, fully loaded with fuel and cargo for a flight from Halifax to Spain. Can the 747 really do that? No. Not at gross.
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