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The Hopfner HS-5-28 was a utility aircraft built in Austria in the late 1920s. It was a conventional parasol-wing monoplane with seating for two occupants in tandem open cockpits. The landing gear was of fixed tailskid type with divided main units. Two examples were built with Walter NZ60 engines followed by two more with the more powerful NZ85 for Swiss aeroclub use. One of these latter machines remained in service until 1934.

Made by Hopfner (aircraft manufacturer).

Empty Weight Lb
880
Wing Area Sqm
19
Designer
Theodor Hopfner
Eng 1 Type
Walter NZ85
Max Speed Mph
96
Eng 1 Kw
63
Span In
11
Gross Weight Lb
1430
Capacity
1
Number Built
4
Crew
One pilot
Empty Weight Kg
400
Gross Weight Kg
650
Height In
4
Range Km
1200
Manufacturer
Hopfner (aircraft manufacturer)
Range Miles
750
First Flight
July
Max Speed Kmh
150
Height Ft
8
Span Ft
36
National Origin
Austria
Wing Area Sqft
199
Met Or Eng
met
Span M
11
Length Ft
24
Height M
3
Eng 1 Hp
85
Eng 1 Number
1
Length In
3
Length M
7
Category
Austrian civil utility aircraft 1920-1929
Hopfner aircraft

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