Hi Owain,
Thank you for your reply. Yes, I agree FAR 25 defines many different types of loads... but would speed be considered a "load" regulated by FAR 25.303?
I always understood that 1.5 factor of safety does not apply to the speeds, as stated by bigduke above.
Yes, I understand the Flutter Free margin (1.15 or 1.2VD) is only based on theoretical calculations and never demonstrated, and it is for equivalent airspeed at both constant mach and altitude (meaning no changes in static or dynamic pressure which might induce flutter at a lower speed).
But the VG envelope is not increased by such a margin due to the fact the VG includes G loads, and therefore would induce flutter above Vd. Correct?
Would I also be correct to say that the "Overspeed Margin" in the above VG diagram is the 10% margin between Vne and Vd as defined under FAR 23.1505?
Or is there some other margin above Vne in a VG diagram under FAR Part 23?