the optimal proportion of the weight of the vehicle and payload. It needs to be strong and stiff enough to withstand the exceptional circumstances in which it has to operate. Durability is an important factor. Also, if a part fails, it doesn’t necessarily result in failure of the whole aircraft.
The main sections of an aircraft, the fuselage, tail and wing, determine its external shape.
ALIEN NATION
??
Original Screenplay by Rockne S. OBannon
Rewrite by James Cameron
??
October 1987
FADE IN:
EXT. MOJAVE DESERT - DAY (TELEVISION IMAGE)
A LONG LENS SHOT of a far distant metallic object hovering
just above the ground -- maybe two or three miles away.
The heat waves and the light refraction off the desert-
scape make the object undulate rhythmically, keeping its
true shape and appea
cylindrical tube,
pulling out...
...another CANVAS which we cannot see. Deftly unrolls this,
fitting it carefully into the stolen paintings now-empty frame.
Re-hangs it. Stares for a beat through the opaque helmet visor.
Approves. Slips the rolled-up stolen canvas into the empty tube.
Leaves. Before we follow, we shift angle to see the replacement
canvas...
A cheerful acrylic portrait. Bozo the C
cylindrical "key" into the stainless steel casket. We pull
back to reveal the casket lies in a sealed, uncontaminated room. A group of
people in lab coats -scientists and researchers - stare through the glass
walls.
A young TECHNICIAN, working at a console, keyboards in a series of
commands.
Sswhish. The top of the steel casket swings open. Clouds of white gas
stream out -whatevers inside has bee
or a sphere moving in a fluid the internal diameter is generally used today. Other shapes (such as rectangular pipes or non-spherical objects) have an equivalent diameter defined. For fluids of variable density (e.g. compressible gases) or variable viscosity (non-Newtonian fluids) special rules apply. The velocity may also be a matter of convention in some circumstances, notably stirred vessels.