So call me an alarmist, but has anyone other than Griffin crunched the numbers to see just how safe it is strapping humans to the end of an SRB for launching the CEV?<br /><br />Beyond the quoted specs of the crew maxing out at 3G's at liftoff, what other guarantees are there that anyone can function normally after being turned into a human glop of tapioca after a two-minute ride on top of one of those things? We've all seen videos of the shuttle crews being shaken like crazy with SRBs firing off to the sides; does using one SRB halve the problem, or is the vibration doubled by placing SRB directly underneath?<br /><br />The trajectory guys might be able to mitigate some of this; ATK might know of a way to pour the solid mix so that pogoing and shaking is minimized without compromising necessary flight path -- but what if they can't? How much computer modeling has been done, and how many test flights have to be flown before they're sure? And if we're getting government/contractor guarantees that the system works as advertised, what happens if they're wrong? Think FEMA. By then, no shuttle; no CEV. I see this as a potential roadblock and budget buster that needs an early resolution.<br /><br />Anyone know what the astronauts think?