Patent BE-1913-258868

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Patent BE-1913-258868

“L’hélice a une forme creuse analogue à celle d’une gorge de menuisier ; le creux a une flèche minima de cinq pour cent par rapport à la largeur de la pale au point considéré.”

That is, “The blade has a narrowing form analogous to that of the gouge of a carpenter or furniture maker; the tapering has a narrowing down to five percent relative to the thickness of the blade at the point considered.”

(We are studying "pale", or "pale d'hélice", as tentatively the blunter or thicker edge of the propeller blade. See Pale on French wikipedia.)



Inventor location: 71 rue de l'Orme, Brussels, Belgium

Year filed
Year granted 1913
Office BE
Patent number 258868
Inventors Henry Félix Villard
Inventor country BE
Applicant person Henry Félix Villard
Applicant firm
Applicant type INDIV
Applicant is inventor? Yes
Original title Perfectionnements aux hélices
English title Improvements in propeller blades
Tech fields propellers, aerodynamics, propulsion, design
Filing date
Full specification filed date
Application number
Grant date July 29, 1913
Granted? Yes
Publication date
Supplementary to patent
Related to aircraft? Yes
Serial number
Patent agent
Assigned to
National tech categories BE K
Family year
First filing? No
Number of citations
Cited by
Application ID
Number of text pages
Number of diagram pages
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