B-9 Bomber

B-9 bomber and P-26 fighter in flightThe Boeing B-9 bomber was the earliest plane based on the Monomail design. It had a top speed of 186 mph and could outrun the fighters of the day by 5 mph. The monoplane bomber reached this speed although it had a five-person crew (in open cockpits) and carried a 2,400-pound bomb load.

Boeing built the YB-9 prototype bombers at company expense to show their design potential to the military. This high-speed aircraft inspired other airplane manufacturers to launch a new generation of bombers, such as the Martin B-10. Because fighters were expected to be faster than bombers, the B-9 also led to the first monoplane fighters.

Specifications
First flight: April 13, 1931
Model number: 214/215
Classification: Bomber
Span: 76 feet
Length: 51 feet 5 inches
Gross weight: 13,919 pounds
Top speed: 186 mph
Cruising speed: 158 mph
Range: 1,150 miles
Ceiling: 20,150 feet
Power: Two 600-horsepower P&W Hornet engines
Accommodation: 5 crew
Armament: 2 machine guns, 2,400-pound bomb load