HPK SP-1
| HPK SP-1 | |
|---|---|
| Role | Homebuilt aircraft |
| National origin | United States of America |
| Manufacturer | HPK Aircraft Associates, a division of Engle Flying Service, Inc. |
| Designer | Harold Hayden, Art Payne, Robert Kinney, Norman R. Benner |
| First flight | 23 August 1957 |
| Introduction | 1957 |
| Number built | 1 |
The HPK SP-1 a.k.a. "Some Pisser-1" is a single seat homebuilt aircraft.[1]
Design and development[edit]
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.[2]
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.[3]
Operational history[edit]
The aircraft was built and tested at Three-M airfield in Pennsylvania, home of Kaiser-Fleetwings Company.[4] The prototype has been registered for over 50 years.[5]
Specifications (HPK SP-1)[edit]
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: 140 kn (160 mph, 260 km/h)
- Cruise speed: 126 kn (145 mph, 233 km/h)
- Stall speed: 43 kn (50 mph, 80 km/h)
- Wing loading: 13 lb/sq ft (63 kg/m2)
References[edit]
- ^ "Abandoned & Little-Known Airfields: Pennsylvania - Northeastern Philadelphia area". Retrieved 17 June 2011.
- ^ Sport Aviation. February 1959.
{{cite journal}}: Missing or empty|title=(help) - ^ Frederick Thomas Jane. Jane's all the world's aircraft.
- ^ "Abandoned and little known airfields". Retrieved 17 June 2011.
- ^ "N65X". Retrieved 17 June 2011.