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Porterfield CP-65 “Collegiate”
Two-seat light training high-wing monoplane

Archive Photos ¹

1941 Porterfield CP-65 Collegiate (NC37895, s/n 1025, 1941) on display at the 2009 Cable Air Show, Cable Airport, Upland, California (John Shupek photo copyright © 2009 Skytamer Images)

Overview ²

  • Role: two-seat monoplane trainer
  • Manufacturer: Porterfield Aircraft Corporation
  • First flight: 1936
  • Introduced: 1936
  • Produced: 1936-1941
  • Number built: 400

The Porterfield Collegiate was an American two-seat training monoplane built by the Porterfield Aircraft Corporation of Kansas City.

Development ²

Developed originally as the Porterfield “Zephyr” a light-weight version of the earlier Model 35 “Flyabout” for use a pilot trainer. Powered by a 40-hp (30 kW) Continental A-40 engine it was later re-designated the Porterfield CP-40. To improve performance the engine was replaced with a 50-hp (47 kW) Continental A50-4 engine and re-designated the CP-50 “Collegiate”. It was a braced high-wing monoplane with a tailskid fixed landing gear. Total production was about 400 when production stopped in 1941 at the start of American involvement in the Second World War. A number of variants were produced with different engine installations.

Variants ²

  • Porterfield CP-40 Zephyr: Original 40-hp version
  • Porterfield CP-50: Improved production variant with a 1935 production variant with a 50-hp (47kW) Continental A50-4 engine
  • Porterfield CP-55: Revised engine cowling
  • Porterfield CP-65: Powered by a 65-hp (48 kW) Continental A65-8/9 engine.
  • Porterfield FP-60: Powered by a 60-hp (45 kW) Franklin 4AC-171-A1 engine.
  • Porterfield FP-65: Powered by a 65-hp (48 kW) Franklin 4AC-176-B29 engine.
  • Porterfield LP-50: Powered by a 50-hp (37 kW) Avco Lycoming O-145-A1 engine.
  • Porterfield LP-55: Powered by a 55-hp (41 kW) Avco Lycoming O-145-A3 engine.
  • Porterfield LP-65: Powered by a 65-hp (48 kW) Avco Lycoming O-145-B1/B2 engine.

Specifications and Performance Data (CP-65) ³


  • Two-seat light training monoplane.


  • High-wing braced monoplane.
  • Rigidly-strutted center section, with outer wings braced to bottom longerons of the fuselage section by parallel streamline steel-tube struts.
  • Wing structure consists of two spruce spars and build-up ribs, the hole covered with fabric.


  • Welded steel-tube structure, covered with fabric.

Tail Unit:

  • Wire-braced monoplane type.
  • Welded steel-tube framework, covered with fabric.
  • Adjustable tail-plane.


  • Split type.
  • Consists of two faired-in side Vees and two half-axles hinged to a Vee cabane below the fuselage through Goodyear rubber-disc shock-absorbers.
  • Low-pressure wheels.
  • Steerable tail-wheel.

Power Plant:

  • One 65-hp Continental A-65-8 or A-65-9 four-cylinder opposed air-cooled engine on welded steel-tube mounting.
  • Fuel tank (13.5 US Gallons) in fuselage.


  • Enclosed cabin seating two in tandem with dual controls.


  • Span: 34 ft 9 in (10.6 m)
  • Length: 22 ft 8 in (6.9 m)
  • Height: 7 ft 0 in (2.1 m)


  • Wing area: 169 ft² (15.7 m²)


  • Weight empty: 700 lb (317.5 kg)
  • Weight loaded: 1,200 lb (544 kg)


  • Wing loading: 7.1 lb/ft² (34.67 kg/m²)
  • Power loading: 18.5 lbs/hp (8.39 kg/hp)


  • Maximum speed: 108 mph (174 kmh)
  • Cruising speed: 103 mph (166 kmh)
  • Landing speed: 40 mph (64 kmh)
  • Initial rate of climb: 1,030 ft/min (314 m/min)
  • Service ceiling: 18,000 ft (5,486 m)
  • Cruising range: 300 miles (480 km)


  1. Photos, John Shupek, Copyright © 2009 Skytamer Images. ALL RIGHTS RESERVED
  2. Wikipedia. Porterfield Collegiate
  3. Bridgman, Leonard (editor). “The Porterfield “Collegiate” Trainer”, Jane's All The World’s Aircraft 1941, The MacMillan Company, New York, 1942, pages 204c-205c.

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