Trisha Shetty (Editor)

Arup S 4

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First flight
  
March 19, 1935

The Arup S-4 (Model 104) is the last in a series of round-wing aircraft from C.L. Snyder.

Contents

Design and development

The S-4 was engineered by Raoul Hoffman. The test pilot was Glenn Doolittle, a cousin of Jimmy Doolittle.

The S-4 used a low aspect ratio, circular planform wing with a conventional landing gear and a small rudder with attached elevator on the rear of the fuselage. The aircraft was entered through a door mounted on the bottom of the aircraft.

Operational history

The S-4 prototype flew extensively in promotional demonstrations. The S-4 was emblazoned with Sears Roebuck and Company logos. The aircraft was scrapped for war materials in World War II. Mabey scavenged for instru and engine but not scrapped

Variants

  • Hoffman Flying Wing a design based on the Arup S-4 aircraft.
  • Milt Hatfield Little Bird - similar design.

    • Aircraft on display

    A replica is on display in the atrium of South Bend Airport

    Specifications (S-4)

    Data from Janes, Popular Aviation

    General characteristics

  • Capacity: 2
  • Length: 18 ft 6 in (5.64 m)
  • Wingspan: 22 ft (6.7 m)
  • Wing area: 273 sq ft (25.4 m2)
  • Airfoil: NACA M-6
  • Empty weight: 650 lb (295 kg)
  • Gross weight: 1,200 lb (544 kg)
  • Fuel capacity: 18
  • Powerplant: 1 × LeBlond 70-5 5-cyl. air-cooled radial piston engine, 70 hp (52 kW)
  • Maximum speed: 100 kn; 185 km/h (115 mph)
  • Service ceiling: 9,000 ft (2,700 m)
  • Rate of climb: 580 ft/min (2.9 m/s)

    • References

    Arup S-4 Wikipedia
    (Text) CC BY-SA