Mackay: Pushing the envelope

  • by: HARVEY MACKAY
  • Updated: November 3, 2013 - 2:00 PM

“Pushing the envelope” is a phrase that originated with American test pilots like Chuck Yaeger and John Glenn in the 1940s. It described maximum stress situations for the metal skin (“envelope”) of a jet aircraft. In other words, the plane was designed to fly safely up to a certain speed for a certain distance at a certain altitude.

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