Re: survivable 21G
>>For contrast, there are abort scenarios for Soyuz launches that regard 21G as 'survivable'.
>Survivable? By what prithee tell...
Col. John Stapp, and presumably well-trained Russian cosmonauts. The seats/couches in the Soyuz capsule are bespoke for each occupant, and Col. Stapp demonstrated that with the right seat and harnesses, the human body (in the appropriate orientation) can survive surprisingly high acceleration/decelerations.