Based on the model tests, this concept, together with the high efficiency of contra-rotating propellers, is expected to exceed savings as much as 20 percent in fuel consumption compared with a ...

Each of its four Allison T40-A-10 engines comprised two smaller jet power sections mounted side by side, and geared to a set of contra-rotating propellers. The 5,500-shaft-horsepower T40 was ...

GimBall’s design is a bit of a departure from the norm as well. Contra-rotating airplane propellers provide thrust while countering torque. It appears that the propellers are driven by two ...

Equipped with a powerful Pratt & Whitney R-4360-8 Wasp Major radial engine producing 3,000 horsepower, the Skypirate featured ...