Samiksha Jaiswal (Editor)

HPK SP 1

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First flight
  
August 23, 1957

The HPK SP-1 a.k.a. "Some Pisser-1" is a single seat homebuilt aircraft.

Contents

Design and development

Engle Flying Service members, Harold Hayden, Art Payne, Robert Kinney, and Norman R. Benner developed the HPK SP-1 over the course of five years. Plans for a two-seat side by side, and four seat variants were not completed.

The SP-1 is a single-place, all-metal, low-wing aircraft with conventional landing gear and partial span split trailing edge flaps. The cowling is from a Piper Tri-Pacer.

Operational history

The aircraft was built and tested at Three-M airfield in Pennsylvania, home of Kaiser-Fleetwings Company. The prototype has been registered for over 50 years.

Specifications (HPK SP-1)

Data from sport aviation

General characteristics

  • Length: 19 ft 1 in (5.82 m)
  • Wingspan: 25 ft (7.6 m)
  • Height: 8 ft 1 in (2.46 m)
  • Wing area: 99 sq ft (9.2 m2)
  • Airfoil: 4412
  • Empty weight: 1,300 lb (590 kg)
  • Powerplant: 1 × Lycoming O-235-C1 , 115 hp (86 kW)
  • Propellers: 2-bladed

    • Performance

  • Maximum speed: 139 kn; 257 km/h (160 mph)
  • Cruise speed: 126 kn; 233 km/h (145 mph)
  • Stall speed: 43 kn; 80 km/h (50 mph)
  • Wing loading: 13 lb/sq ft (63 kg/m2)

    • References

    HPK SP-1 Wikipedia
    (Text) CC BY-SA