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The XP-42, was an experimental fighter built by Curtiss Aircraft in the late 1930s to research engine cooling and improving the performance of the Curtiss P-36.

XP-42
Curtiss XP-42 061019-F-1234P-033.jpg
Role Engine cooling research
National origin United States
Manufacturer Curtiss
First flight March 1939
Number built 1
Developed from Curtiss P-36

Contents

Design and developmentEdit

The fourth production P-36A (serial 38-004) became a development platform for a direct successor, designated XP-42 by the USAAC. The most striking difference with the P-36 was a longer, streamlined nose cowling (concealing a longer propeller shaft). These features attempted to improve the aerodynamics of the air-cooled radial engine. Because of this feature, the XP-42 superficially resembled aircraft equipped with in-line liquid-cooled engines (such as the P-40, another development of the P-36). When the XP-42 first flew in March 1939, it proved to be faster than the P-36. However, the P-40 was faster and the new nose cowling caused engine cooling problems that proved to be unresolvable, despite at least 12 sets of modifications. The XP-42 project was canceled. However, the XP-42 prototype was retained as a test-bed and was later fitted with an all-moving tail (stabilator), for research purposes. The XP-42 was powered by a Pratt & Whitney R-1830-31 engine fitted with extensions to the propeller shaft and nose casing to give it a streamlined nose.

Specifications(XP-42)Edit

Data from Curtiss aircraft, 1907-1947[1]

General characteristics

  • Crew: 1
  • Length: 28 ft 6 in (8.69 m)
  • Wingspan: 37 ft 3.5 in (11.367 m)
  • Height: 11 ft 1 in (3.38 m) top of propeller disc
  • Wing area: 235.9 sq ft (21.92 m2)
  • Airfoil: root: NACA 2215; tip: NACA 2209[2]
  • Empty weight: 4,818 lb (2,185 kg)
  • Gross weight: 5,650 lb (2,563 kg)
  • Max takeoff weight: 6,260 lb (2,839 kg)
  • Powerplant: 1 × Pratt & Whitney R-1830-31 14-cylinder air-cooled radial piston engine, 1,050 hp (780 kW)
  • Propellers: 3-bladed constant-speed propeller

Performance

  • Maximum speed: 315 mph (507 km/h; 274 kn) at 15,000 ft (4,600 m)
  • Cruise speed: 270 mph (435 km/h; 235 kn)
  • Range: 730 mi (634 nmi; 1,175 km)

Armament

See alsoEdit

Related development

ReferencesEdit

  1. ^ Bowers, Peter M. (1979). Curtiss aircraft, 1907-1947. London: Putnam. p. 365. ISBN 978-0370100296.
  2. ^ Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.