Seger shot himself in the foot by posting the above VG.
In fact, the out-of-focus text in the Structural Failure zone (red zone) at the left and right arrows designating the "Overspeed Margin" is Vd.
The VG diagram he posted above is based on light aircraft, but basically has many of the same definitions as Jet aircraft, except Vno and Vne were removed from Jets in the 60's. Jets accelerate so fast that pilots were exceeding Vno on a regular basis. They were replaced with Vmo... but Vd is still the end of the flight envelope and the start of the structural failure zone for both types of aircraft.
VG diagrams expressing "Structural Failure" at Vne are used for inexperienced pilots as there is only a 10% margin between Vne and Vd. So basically, only 10-20 knots.
Do you think Seger will admit he is wrong?
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