Curtiss 18

Curtiss 18-T Wasp
General information
Typetwoseat fighter triplane
ManufacturerCurtiss Engineering Corporation
Designer
Primary userUnited States Navy
History
Introduction dateFebruary 1919
First flight7 May 1918

The Curtiss 18T, unofficially known as the Wasp and by the United States Navy as the Kirkham,[1] was an early American triplane fighter aircraft designed by Curtiss for the US Navy.

Design and development

The Curtiss 18T was intended to protect bombing aircraft over France, and a primary requisite for this job was speed. Speed was not the triplane's only salient feature: an 18T-2 set a new altitude record in 1919 of 34,910 ft (10,640 m).[2] The streamlined and very "clean" fuselage contributed to the aircraft's performance. The basic construction was based on cross-laminated strips of wood veneer formed on a mold and attached to the inner structure. The technique was a refinement of that used on the big Curtiss flying boats.[3]

Operational history

Flown by Roland Rholfs, the 18T achieved a world speed record of 163 mph (262 km/h) in August 1918 carrying a full military load of 1,076 lb (488 kg).[4]

The Model 18T-2 was an improved version of its predecessor, with 50 additional horsepower. The wings of the new model were swept back. It was also 5 ft (150 cm) longer with a 9 ft (270 cm) larger two-bay wing, though its operational ceiling was 2,000 ft (610 m) lower.

After World War I, it was employed as a racing plane: an 18T-2 nearly won the Curtiss Marine Trophy Race in 1922 (limited to U.S. Navy pilots), but the pilot, Lt. Sanderson ran out of fuel just before the finish line.[5]

Curtiss Engineering followed the Model 18T with the Model 18B, unofficially known as the "Hornet", built to otherwise similar specifications.

The 18T-1
Curtiss 18-B

Variants

Model 18T or 18T-1
Two-seat fighter triplane with single-bay wings, powered by a 400 hp (300 kW) Curtiss K-12 piston engine. Referred to by the US Navy as the "Kirkham". Originally designated 18T, the type was redesignated the 18T-1 when the prototype was modified to a new configuration designated 18T-2 (see below).
Model 18T-2
18T with longer-span two-bay wings. Could be fitted with floatplane or landplane landing gear.
Model 18B
Biplane fighter version, known unofficially as the "Hornet". Sole flying prototype of Curtiss 18B, USAAS 40058, 'P-86', crashed early in flight trials at McCook Field, Dayton, Ohio, summer 1919. Type not ordered into production. One non-flying prototype also delivered for static testing.[6]

Operators

 United States

Specifications (18T-1 Wasp)

Data from Curtiss Aircraft 1907–1947[7]

General characteristics

  • Crew: 2
  • Length: 23 ft 4 in (7.11 m)
  • Wingspan: 32 ft 0 in (9.75 m)
  • Height: 10 ft 2 in (3.10 m)
  • Wing area: 288 sq ft (26.8 m2)
  • Airfoil: Sloane[8]
  • Empty weight: 1,980 lb (898 kg)
  • Gross weight: 3,050 lb (1,383 kg)
  • Powerplant: 1 × Curtiss K-12 V-12 water-cooled piston engine, 400 hp (300 kW)
  • Propellers: 2-bladed fixed-pitch propeller

Performance

  • Maximum speed: 163 mph (262 km/h, 142 kn)
  • Endurance: 5 hours 54 minutes
  • Service ceiling: 23,000 ft (7,000 m)
  • Time to altitude: 12,500 ft (3,800 m) in 10 minutes

Armament

  • Guns:
Primary: 2 × forward-firing synchronized 0.300 in (7.62 mm) Marlin Rockwell M1917/M1918 machine-guns
Secondary: 2 × 0.300 in (7.62 mm) Lewis guns on a Scarff ring in the rear-cockpit plus 1 × Lewis gun firing through an aperture in the aircraft's belly

Notes

  1. ^ PART 2 Test of Strength 1917-1919 Archived December 3, 2010, at the Library of Congress Web Archives Retrieved: 13 January 2011.
  2. ^ Naval investigation, hearings before the subcommittee of the Committee on Naval Affairs. Washington: United States Senate, 66th Congress, 2d session, 1921. Retrieved: 13 January 2011.
  3. ^ "Curtiss # to J." aerofiles.com. Retrieved: 13 January 2011.
  4. ^ "Aviation History Facts: August 1." Archived 2007-09-30 at the Wayback Machine Centennial of Flight, 2003. Retrieved: 13 January 2011.
  5. ^ Berliner, Don. "A Concise History of Air Racing." Society of Air Racing Historians, 9 January 2007. Retrieved: 13 January 2011.
  6. ^ Green, William, and Swanborough, Gordon, "Fighter A To Z", Air International, Bromley, Kent, UK, February 1976, Volume 10, Number 2, page 98.
  7. ^ Bowers, Peter M. (1979). Curtiss aircraft, 1907-1947. London: Putnam. pp. 138–143. ISBN 0370100298.
  8. ^ Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

Bibliography

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