So the cylindrical portion must be protected from several hazards,

 

to separate itself from the passengers.

 

Then fire, explosions (force of which it should be calculated, then

added layer of plating around it) etc....

 

 

Also Mr Musk, if applicable, I have once thought of a parachute

design. That is, say the surface area of the expanded parachute,

is organized in large squares, or as a grid.

 

And say, each one of those squares, expands further by the air...

Will it have more dragging power is a smaller surface area?

 

I thought this in a specialized umbrella, after 9/11.

But.... Ok, maybe not. Not for the wings maybe. Nevermind.

 

If the core engine fails, parachute is needed after its ejection.

 

And as it buys time, the jet engines from the wings can continue flight.