Patent GB-1896-9129

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The helicopter-type propellers change alignment and shape in order to become aeroplane-type sustaining surfaces for horizontal flight.

"The object of the present invention is to provide a screw propeller for raising and lowering airships in a vertical direction which can also be used as a sustaining surface or aeroplane when the airship is rapidly propelled in a horizontal direction."

Wing camber: "I prefer that the wings should be so constructed that the air pressure from beneath will cause them to assume the shape of segments of spheres, since these and similar arched surfaces, which greatly resemble the wings of birds, are the most effective aeroplanes known at the present time. A convenient construction consists in making the framework of the wings after the fashion of an ordinary cycle wheels..."

"Having adjustable blades which can be set so as to lie in the same plane or parallel planes. (Aeronautical Journal, Vol. 1, No. 1, January 1897, p. 14.)

See also Patent FR-1896-255717 and Patent US-1896-pt.

  • Template:Fast approval -- for some reason, not obvious, the British patent office granted this patent just 30 days after it was submitted ("filed"). A natural reason would be that it was a foreign filing of a patent previously approved in the U.S. or Germany, but it is not clear on the patent document itself that it is a foreign filing.
  • Inventor location: 50 Centre Street, Cleveland, Ohio


Year filed 1896
Year granted 1896
Office GB
Patent number 9129
Inventors Rudolph Kosch
Inventor country US
Applicant person Rudolph Kosch
Applicant firm
Applicant type INDIV
Applicant is inventor? 1
Original title A combined Screw Propeller and Aeroplane, for raising, lowering, and sustaining Air Ships
English title Combined screw propeller and aeroplane, for raising, lowering, and sustaining airships
Tech fields helicopter, airplane, propeller, propulsion, navigation, airfoil, LTA
Filing date 1896-04-30
Full specification filed date 1896-04-30
Application number
Grant date 1896-05-30
Granted? 1
Publication date
Supplementary to patent
Related to aircraft? 1
Serial number
Patent agent E. P. Alexander & Son
Assigned to
National tech categories
Family year 1896
First filing? 1
Number of citations
Cited by
Application ID
Number of text pages 3
Number of diagram pages 3
Number of figures 10
Number of claims 6