Netters; I for one would be very interested to learn how the FAA requires a certified aircraft's Vne be determined and also how aircraft designers work out that number and then flight test to it. The designer and builder of the prototype M-19 Flying Squirrel that I'm replicating said that he set the airplane's Vne to be 90 MPH based on his having flown the plane at 95 MPH for 3 minutes and it holding together, and then setting the Vne to be 95% of that.
Knowing the designer and builder of that plane and knowing the era in which the plane was designed, built, and flown- I'm quite certain that the speeds he used are indicated airspeeds. I know that in my case at least, the airspeed indicator is what I would be watching if I was deliberately holding an experimental aircraft at an airspeed in excess of its redlined Vne for three minutes. However, I will grant that things happen MUCH faster at 200+ MPH than they do at 90+ MPH with a good example being that if I fly my plane at 90MPH for three minutes, I'll still be in our local training area when the time expires. At 200 MPH, a plane traveling in a straight line will have traveled 10 miles and will be completely out of sight when time expires. Oscar Zuniga Medford, OR Air Camper NX41CC flying, Cont A75 power Flying Squirrel N7238B under construction, 1835 VW power
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