Originally Posted by
megan
From the above link. Worrying about bags in the overhead? Don't think pax will ever get the message. Imagine the chaos with a full load, rather than the handful that were on board.
Even landing on water it must take more than 150 metres to come to a stop, seems incredibly short, what did Sully take, though the difference is he didn't have the gear down?
'
Maybe.
- 2g deceleration would stop the plane in about 6.7 seconds, and 185 meters
- 3g gives about 4.5 seconds, 130 meters
- 6g is 2.5 seconds, and about 70 meters
Peak loads could be easily 3 -5 times or more of these values for very short periods, and probably were with the gear being down.
Those are within reasonable limits for the seat design (Part25.561) which requires demonstration of 9g forward design load for compliance.
9g stops in around 1.5 seconds, and about 45 meters.
The body can survive much higher short period loads, (McKenney, 1970) but that is also when using proper restraint which includes shoulder harnesses. The pilots do OK, other than being first to the scene, pax get to see up close and personal the objects in front of their lap.
(the Ethiopian B767 hijack ditching off the Comoros stopped in about 5 seconds, from a higher speed, with mean decelerations around 5g, stopping in around 220 meters but involving high lateral loads as well and massive kit setting of the structure. Peak lateral loads were severe, as were the longitudinal loads. Vertical peak load was lower than the longitudinal load).
McKenney, William R,, Human Tolerance to Abrupt Accelerations: A summary of the Literature. Dynamic Science Report 70-13, May, 1970