Boeing YB-9

1st Flight 1931

The Boeing YB-9 was the first all-metal monoplane bomber aircraft designed for the United States Army Air Corps.

The YB-9 was an enlarged alteration of Boeing’s Model 200 Monomail commercial transport.

Variants

Boeing model B-215 / YB-9 – Pratt & Whitney R-1860-13 Hornet B (575 hp), Re-engine with supercharged Pratt & Whitney R-1860-11 Hornet B (600 hp) and was fitted with three-bladed propellers, Trim tab ran the full height of the rudder.

Boeing model B-214 / Y1B-9 (one produced) Curtiss GIV-1570 Conqueror (Curtis V-1570-29 Conqueror) (600 hp), Re-engine with supercharged Pratt & Whitney R-1860-11 Hornet B (600 hp) and was fitted with three-bladed propellers, Short trim tab on rudder.

Boeing model B-246 / Y1B-9A (five produced) Pratt & Whitney R-1860-11 Hornet B (Y1G1SR-1860B) (600 hp), Metal instead of fabric covering on the control surfaces, There were also many internal structural and equipment changes.

Specifications

Crew: 4

Length: 52 ft 0 in (15.85 m)

Wingspan: 76 ft 10 in (23.42 m)

Height: 12 ft 0 in (3.66 m)

Wing area: 954 sq ft (88.7 m2)

Empty weight: 8,941 lb (4,064 kg)

Max take-off weight: 14,320 lb (6,500 kg)

Powerplant: 2 × Pratt & Whitney R-1860-11 Hornet B radial engine, 600 hp (448 kW) each

Performance

Maximum speed: 188 mph (302 km/h, 163 kn) at 6,000 ft (1,830 m)

Cruise speed: 165 mph (265 km/h, 143 kn)

Range: 540 mi (869 km, 470 nmi)

Service ceiling: 20,750 ft (6,325 m)

Rate of climb: 900 ft/min (4.6 m/s)

Armament

Guns: 2× .30 in (7.62 mm) machine guns

Bombs: 2,260 lb (1,030 kg) bombs.

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