The Sikorsky H-5 and British Westland Dragonfly represent the kind of intermediate generation needed before a Whirlwind-equivalent aircraft. Their 450- to 520-horsepower radial engines fit the interwar engineering path, even though their useful load remains small. The Dragonfly's Alvis Leonides engine had been developed in 1936, providing an interwar starting point for its power plant. A pilot and three passengers are enough for rescue, communications, liaison, and moving an admiral with a few staff officers between ships. Those modest missions give fleets reasons to operate the machines regularly and discover new requirements before heavier weapons or sensors are ready. Sustained use and funding matter more to this development path than finding a single isolated inventor.
Notable Point · 30:33-34:25
The Dragonfly generation proves useful before it becomes powerful
Even a three-passenger H-5 or Dragonfly gives navies a practical platform for rescue, communications, staff transport, and operational experimentation.