Consolidated P-30

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Consolidated P-30
Type	Fighter aircraft
Manufacturer	Consolidated Aircraft
Designed by	Robert J. Woods
Status	Retired
Primary user	United States Army Air Corps
Number built	60

The Consolidated P-30 (PB-2) was a 1930s two-seat fighter aircraft. An attack version called the A-11 was also built, along with two Y1P-25 prototypes and YP-27, Y1P-28, and XP-33 proposals. The P-30 is significant for being the first fighter in United States Army Air Corps service to have retractable landing gear, an enclosed and heated cockpit for the pilot, and an exhaust-driven turbosupercharger.

1 Development
2 Operational history
3 Variants
4 Specifications (PB-2A)
5 References
6 Related content

[edit] Development

The P-30 has its origins in the cancelled Detroit-Lockheed YP-24/A-9. After collapse of the Detroit Aircraft Corporation in 1931, the chief YP-24 designer Robert J. Woods went to work for Consolidated Aircraft. Since the YP-24 was a victim of the Great Depression and not flawed design and the Army Air Corps was still interested in the type, Woods continued his work, producing the Y1P-25. The new aircraft differed from YP-24 in being somewhat larger and having an all-metal wing and a turbosupercharged engine. The Y1P-25 and its sister attack version, the Y1A-11 armed with four forward-firing machine guns and racks for 400 lb (182 kg) of bombs, were ready for testing in December 1932. Although both prototypes were lost in crashes a week apart in January 1933, Army Air Corps was pleased enough to order production of four P-30 fighters and four A-11 attack aircraft. Production versions differed from prototypes in having more powerful engines and revised landing gear and cockpit canopes.

[edit] Operational history

Army Air Corps testing in January 1934 revealed good performance, especially at altitude. However, pilots questioned utility of the gunner who had a limited field of fire and was vulnerable to blackouts during hard maneuvering. Three P-30s were delivered to the 94th Pursuit Squadron at Selfridge Field. In December 1934, Army Air Corps ordered an additional 50 P-30A, redesignated PB-2A (Pursuit, Biplace), with further upgraded engines and onboard oxygen equipment for high altitude flying. On 17 October 1936, Lt. John M. Sterling flying a PB-2A won the Mitchell Trophy race with a speed of 217.5 mph (350.2 km/h). Although high-altitude flights were rare at the time, in March 1937, a PB-2A flew for 20 minutes at 39,300 feet (11,980 m). Since PB-2A was one of the few aircraft at the time to have retractable landing gear, several were damaged in unintentional "wheels up" landings.

Consolidated attempted to further refine the design by proposing YP-27 with a Pratt & Whitney R-1340-21G Wasp engine with 550 hp (410 kW), YP-28 with a Pratt & Whitney R-1340-19F Wasp with 600 hp (448 kW), and XP-33 with a Pratt & Whitney R-1830-1 Twin Wasp with 800 hp (597 kW), none of which left the drawing board. One PB-2A was converted to a single-seat configuration intended as P-26 Peashooter replacement but it still proved too heavy and crashed during early testing.

While generally trouble-free, PB-2A was slow and heavy, and by 1939 all were replaced in frontline service by Seversky P-35 and Curtiss P-36 Hawk.

The A-11 attack version failed to win a production order beyond the original four aircraft in spite of good performance because USAAC wanted more durable radial engines for its attack aircraft. One was converted to the XA-11A testbed with the new Allison XV-1710-7 engine with 1,000 hp (746 kW).

[edit] Variants

Y1P-25 - further development of Lockheed YP-24, all-metal wing, Curtiss V-1570-27 Conqueror engine with 600 hp (448 kW) and turbosupercharger, 1 built
YP-27 - Pratt & Whitney R-1340-21G Wasp radial engine with 550 hp (410 kW), none built
YP-28 - Pratt & Whitney R-1340-19F Wasp with 600 hp (448 kW), none built
P-30 (PB-2) - first production version of Y1P-25, V-1570-57 engine with 675 hp (504 kW) and turbosupercharger, 4 built
P-30A (PB-2A) - V-1570-61 engine with 700 hp (522 kW) and turbosupercharger, 50 built
XP-33 - Pratt & Whitney R-1830-1 Twin Wasp with 800 hp (597 kW), none built
Y1A-11 - ground attack version of Y1P-25 with 4x 0.30 in (7.62 mm) forward-firing machine guns and up to 400 lb (182 kg) of bombs, non-supercharged engine, 1 built
A-11 - trial run of the ground attack version, V-1570-59 engine without turbosupercharger, 4 built
XA-11A - Allison XV-1710-7 with 1,000 hp (746 kW), one A-11 converted

[edit] Specifications (PB-2A)

General characteristics

Crew: 2
Length: 29 ft 10 in (9.1 m)
Wingspan: 43 ft 11 in (13.4 m)
Height: 8 ft 2 in (2.5 m)
Wing area: 297 ft_ (27.6 m_)
Empty weight: 4,297 lb (1,949 kg)
Loaded weight: 5,632 lb (2,555 kg)

Performance

Maximum speed: 274 mph (238 knots, 441 km/h)
Cruise speed: 215 mph (187 knots, 346 km/h)
Range: 510 mi (440 nm, 820 km)
Service ceiling: 28,000 ft (8,500 m)
Rate of climb: 1,925 ft/min (9.8 m/s)
Wing loading: 19 lb/ft_ (93 kg/m_)

Armament

Guns:
- 2_ 0.30 in (7.62 mm) machine guns firing through the propeller
- 1_ 0.30 in machine gun in the rear cockpit

[edit] References

Bowers, Peter M., Angellucci, E. (1987). The American Fighter. Orion Books. ISBN 0-517-56588-9.
Swanborough, G., Bowers, Peter M. (1989). United States Military Aircraft Since 1909. Smithsonian. ISBN 0-87474-880-1.