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The design of slender wing, supersonic airliners has been
considered from the viewpoint of obtaining maximum space utilization,
A relationship between direct operating cost on trans-atlantic services
and space utilization has been established, which shows, as might be
expected, that the direct operating costs decrease as the utilization
factor increases.
A penalty associated with a high utility factor is a high wing
loading. This leads to the necessity of using auxiliary lift when high
utilization factors are obtained, It is shown that a propulsive engine
modified to give jet lift at landing and possibly take-off is likely to
be the best means of obtaining auxiliary lift.
The optimum cruise height is less than that corresponding to
maximum lift drag ratio because of the weight penalty associated with
providing adequate thrust.
The integrated layout is not suitable for airliners required to
carry less than a hundred passengers, but becomes extremely attractive
for a very large number of passengers In this case the central part of
the wing area should be of constant depth with a cabin of side by side
multi- bubble form.
The delta planform is not ideal for an integrated layout,
Better space utilization can be obtained using a pointed pear shaped
Planform. Approximate calculations suggest that direct operating costs
of a 120 seat airliner can be reduced by as much as 25% by using this
type of layout. |
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