The concept was simple: take the highly successful Mosquito twin of WWII fame, make it 10% smaller and give it two boosted Merlins cranking out a total over 4,000 horsepower! Even fully loaded at 20,900 pounds, that is a weight-to-power ratio of 5.1 pounds/horsepower. Yehaa! (Oh, and make it a single-seat airplane so there are no arguments among a crew over who gets to fly it.)
These aircraft were originally intended to operate from aircraft carriers in WWII, but the war ended before they went operational. They were used in Asia during the late 40s and remained in squadron service until replaced by jets in the mid-50s.