what is this U shape metal function in term of whole rocket structure?
a. in the small drawing in here
b. the 7th pic in here
are they refer to the same thing.
They may refer to different things and of different function.
no pic here
when I was I draw pic on the wall, when I graduated from college when I
played the rocket once but it was many many years ago. That is I have no
real experience before.