I flutter tested my plane to 240 mph during initial flight testing (of course it was down hill). I wanted to make sure it wouldn’t do anything weird at those speeds, like come apart. The plane is solid and It feels totally comfortable at 150-180k. I would still not recommend it as an IFR platform, however.
The faster it goes, the smoother it feels, right Sam? 👍
The attached pix is from my 496 Garmin after a flight in 2010.
