As a design and sizing example, Fig. $3\mathrm{.}8$ illustrates the mission require$-$

ment for a hypothetical antisubmarine warfare $($ASW$)$ aircraft. The key

requirement is the ability to loiter for $3$ hr at a distance of $1500$ n miles

$\{2778km\}$ from the takeoff point. While loitering on$-$station, this type of air$-$

craft uses sophisticated electronic equipment to detect and track submarines.

For the sizing example, this equipment is assumed to weigh $10,000lb$

$\{4536kg\}.$ Also, a four$-$man crew is required, totaling $800lb\{363kg\}.$ The

aircraft must cruise at $0\mathrm{.}6$ Mach number.