Debunked: The Role of Aeroelastic Flutter in the Events of 9/11


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"at both constant Mach number and constant altitude" - Balsamo had no idea what this meant. Will he understand why he was wrong, will he understand the graph.
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An other big falsehood :

Balsamo says : the aircraft prototypes are subject to high speeds in the wind tunnel. When the aircraft develops an onset of buffeting, flutter, instability, CG v CP.. .etc, Vd is set

The two biggest wind tunnel (at NASA Ames Research Center)
12x24 meters for speed up to 300kts
24x36 meters for speed up to 100kts

Wind tunnel tests are used to measure the velocity around, and forces or pressures upon some structures of the plane, not the VD of a real plane as big as a 767.

Today, finite element analysis and computational fluid dynamics modelling are used to estimate the structural limits, but VD is not the structural limit.

VD is a FAA certification speed representing a security margin on the cruise speed.
a 7.5° pitch down of 20 seconds (approx 1.15VC)
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Brent Holman

New Member
Certainly lives up to the thread title.

I would imagine that Rob Balsamo will soon be retracting his group's claims.:rolleyes:

I replied some years ago on the 'pilotsfortruth site, where they had long involved discussions about the reported airspeeds of the planes that hit the towers...& pointed out that they were obviously going fast enough...whatever the actual speeds were...