23-08-2010, 10:33 AM
On February 7, 2002 the NTSB published a Radar Data Impact Speed Study for UA175 and AA11. It is currently downloadable from here.
In it, the author, Daniel R. Bower, Ph.D. of the NTSB writes of UA175:
Taking into account the Design Diving Speed of 420 knots Calibrated Airspeed, this claims that a Boeing 767-200 could have exceeded the Design Diving Speed by 90 knots and remained intact and controllable.
I seriously don't think that is possible.
In it, the author, Daniel R. Bower, Ph.D. of the NTSB writes of UA175:
Quote:As the aircraft made its final descent to 1000 feet, it accelerated and impacted World Trade Center tower #2 at approximately 510 knots groundspeed.At this low altitude 510 knots groundspeed is equivalent to 510 knots Calibrated Airspeed which equates to roughly 587 mph.
Taking into account the Design Diving Speed of 420 knots Calibrated Airspeed, this claims that a Boeing 767-200 could have exceeded the Design Diving Speed by 90 knots and remained intact and controllable.
I seriously don't think that is possible.
The most relevant literature regarding what happened since September 11, 2001 is George Orwell's "1984".