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> without valid airspeed there's a risk of overspeed which can cause a new set of problems

What problems specifically?

> Nobody believed a passenger aircraft would be so stable during a full stall.

What was the plane "supposed" to do during the stall? If you're inside the plane, how does it feel when the plane has stalled?




> What problems specifically?

All aircraft have a VNE speed, the NE standing for "never exceed." Going beyond this threshold invites structural failure and loss of control.

> If you're inside the plane, how does it feel when the plane has stalled?

I've mentioned this in another comment, but the body is a horrible judge of spatial reference. How the body is going to feel during a stall is tough to predict, particularly given that as a passenger a) you will have no visual reference and b) you will be at a unique distance from the aircraft's center of gravity.

That said, you might feel a little buffeting as the wing reaches a critical angle of attack, but once the plane is in a full stall you probably wouldn't feel a whole lot. It's impossible to overstate just how much the body relies on the Mark One Eyeball to properly interpret the sensation motion, gravity, centrifugal force, etc.

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Not all planes are stable in a full stall, some lose longitudinal stability and will be almost impossible to keep level.

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Oh sure but most passenger planes are pretty docile a stall.

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