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The Hillson Bi-mono was a British experimental aircraft of the 1940s. It was designed to test the idea of slip-wings where the aircraft could take off as a biplane jettison the upper disposable wing and continue flying as a monoplane. A single example was built which successfully demonstrated jettisoning of the slip wing in flight.

Made by F Hills & Sons.

Span Ft
20
Eng 1 Type
air-cooled six-cylinder inline engine
Wing Area Note
66.0
Span In
Gross Weight Lb
1940
Airfoil
Lower wing RAF 34
Upper wing Clark Y
Number Built
1
Crew
1
Height In
Perfhide
Y
Manufacturer
F Hills & Sons
Height Note
as biplane - 6 ft 4 in as monoplane
First Flight
1941
Eng 1 Name
De Havilland Gipsy Six
Height Ft
7
Origin
United Kingdom
National Origin
United Kingdom
Wing Area Sqft
132
Length Ft
19
Prime Units
imp
Eng 1 Hp
200
Eng 1 Number
1
Length In
6
Category
British experimental aircraft 1940-1949

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