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

A circa 1957-58 photo of a HPK SP-1 at 3M Airport (courtesy of Tom Beamer).1

Made by HPK Aircraft Associatesa division of Engle Flying ServiceInc..

The HPK SP-1 aka "Some Pisser-1" is a single seat homebuilt aircraft. Hu-Go Craft The Hu-Go Craft is a hombuilt biplane.2
Empty Weight Lb
1300
Stall Speed Mph
50
Designer
Harold Hayden
Art Payne
Robert Kinney
Norman R. Benner
Span Ft
25
First Flight
23
Cruise Speed Mph
145
Wing Loading Lb/sqft
13
Introduced
1957
Airfoil
4412
Number Built
1
Prop Blade Number
2
Height In
1
Manufacturer
HPK Aircraft Associates
a division of Engle Flying Service
Inc.
Max Speed Mph
160
Eng 1 Name
Lycoming 0-235-C1
Prop Dia In
72
Height Ft
8
Origin
United States
National Origin
United States
Wing Area Sqft
99
Length Ft
19
Prime Units
kts
Eng 1 Hp
115
Eng 1 Number
1
Length In
1
Category
Homebuilt aircraft

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