Called the “Skyrocket” for its outstanding climbing ability, a Grumman fighting plane built for the U. S. Navy is understood to have passed 450 miles an hour in test flights. Although its specifications are secret, claims are made that it can outclimb any other airplane by virtue of the greatest horsepower per pound ever built into a plane. Twin-motored, it has a short body and twin rudders, offering high maneuverability. It is a single-seat ship, heavily armed, able to pour uninterrupted fire from its nose. With its larges fuel capacity it can convoy bombers on longe-range missions. The engines are air-cooled.