Ryson STP-1 Swallow

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STP-1 Swallow
Role Experimental two-seat powered cruising sailplane
National origin United States
Manufacturer Ryson Aviation Corporation
First flight 1972
Number built 1

The Ryson STP-1 Swallow is an American experimental two-seat powered cruising sailplane designed and built by the Ryson Aviation Corporation to be license built by other companies.[1]

Design and development[edit]

The design of the Swallow was started in 1970 with the prototype completed during 1971, it was test flown from 1972. The Swallow is a cantilever mid-wing monoplane, the name is derived from the distinctive tail unit, it has a pusher propeller located between twin fins and rudders. The 76 hp (57 kW) Barking converted Volkswagen motor-car engine is mounted mid-fuselage and drives the two-bladed variable-pitch fully feathering pusher propeller using a 5 ft (1.52 m) tubular shaft. To provide cooling a retractable air-scoop is mounted above the rear fuselage. The forward fuselage is an all-metal monocoque structure with the rear section made from welded steel-tube with a glassfibre covering. The all-metal single spar wing and the tandem two-seat enclosed cockpit were taken from a Schweizer SGS 2-32 glider. It has a bicycle type landing gear with outriggers on the wing tips, the nosewheel is retractable by hand and the main wheel is semi-prone and fixed.[1]


Data from Jane's All the World's Aircraft 1994-95[1]

General characteristics

  • Crew: 2
  • Length: 24 ft 4 in (7.42 m)
  • Wingspan: 51 ft 4 in (17.40 m)
  • Wing area: 180 ft2 (16.70 m2)
  • Aspect ratio: 18.05
  • Empty weight: 1388 lb (629 kg)
  • Gross weight: 1864 lb (845 kg)
  • Powerplant: 1 × Barker-converted CE-2200 Volkswagen motor-car engine, 76 hp (57 kW)


  • Maximum speed: 124 mph (200 km/h)
  • Cruise speed: 100 mph (161 km/h)
  • Stall speed: 50 mph (80.5 km/h)
  • Range: 400 miles (644 km)
  • Endurance: 6+ hours
  • Maximum glide ratio: 28.5:1
  • Rate of climb: 180 ft/min (0.9 m/s)
  • Rate of sink: 3.02 ft/min (0.92 m/s)

See also[edit]

Related lists



  1. ^ a b c Taylor 1973, p. 431


  • Taylor, ed. (1973). Jane's All the World's Aircraft 1973-74. London, United Kingdom: Jane's Yearbooks. ISBN 0-354-00117-5.  |first1= missing |last1= in Authors list (help)