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Comment: "The resulting flat sides of the pear needed
considerable local stiffening to contain the pressurisation loads..."
Saved on weight in fuselage by not using inward opening doors and non hydraulic
actuated but electrical doors. "The Fuselage has two natural pr4oduction
breaks to allow for possible stretching of the whole aircraft at some time
in the future." One is at the forward edge of the wing, just behind
forward cargo door. Note open cargo door on 747 on left, a natural break
is just behind it. 747 fuselage biggest type ever with structural problems
too with pear shape. Note fuselage section joint forward of wing. Modern
Civil Aircraft: 4, Boeing 747, Ian Allan Publishing, 2nd Edition, Peter
Gilchrist, ISBN 0 7110 2050 7
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