I'd wager that most people who don't meet the weight requirements are also anthro'd out of those cockpits. And even then those that are on the edge are probably over 140lb with boots, gear, helmet, etc.You've got the physics right, but it's really not that big of an issue for what is statistically a very small percentage of aircrew. I'm sure someone at NAVAIR or MB has some data, but if it were that big of an issue, they would outright anthro people out of those aircraft instead of simply signing an acknowledgement form. It's not even a waiver, per se. It doesn't indemnify the government from any liability.