US1012507A - Wooden propeller. - Google Patents

Wooden propeller. Download PDF

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Publication number
US1012507A
US1012507A US60703711A US1911607037A US1012507A US 1012507 A US1012507 A US 1012507A US 60703711 A US60703711 A US 60703711A US 1911607037 A US1911607037 A US 1911607037A US 1012507 A US1012507 A US 1012507A
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Prior art keywords
blades
propeller
wooden
layers
glued
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Expired - Lifetime
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US60703711A
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Paul Borrmann
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
    • B64C11/16—Blades
    • B64C11/20—Constructional features
    • B64C11/22—Solid blades
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • PAUL BORRMANN, or EERIJN, GERMANY PAUL BORRMANN, or EERIJN, GERMANY.
  • Wooden propellers for aerial craft are already well-known having blades comprising narrow boards running in the direction of the blades.
  • the boards are superposed in the shape of a fan and then glued together in layers at right angles to the axis of rotation, whereupon they are worked into the required shape of the blade.
  • This known mode of manufacture has various disadvantages Firstly, as is wellknown, in the case of airpropellers it is exceedingly important to make the section of the blade as thin as possible and,particu larly, to make the ends as sharp as possible.
  • a primary object of my inventiov is to provide a wooden propeller, to which these defects are not attached.
  • the two opposite blades of apropeller consist of continuous wooden rods which run in the direction of the blades and, in contradistinction to the blades known heretofore, are glued one with another in layers parallel to the axis of rotation of the propeller.
  • Fig. 2 is a section
  • Fig. 1 and Fig. 3 is a plan, enlarged, showing the outer end of a blade, parts of the veneers being broken away.
  • my propeller comprises a plurality of fiat wooden rods or bars a which run in a direction longitudinally of the blades proper ofthe propeller and are disposed in layers, said layers being extended in a direction parallel to the axis of rotation of the propeller.
  • These wooden rods are made according to a templet having the form of the blade and are firmly glued together.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)

Description

P. BORRMANN.
WOODEN PBOPELLBR.
APPLIOATION FILED 11:13.?, 1911 WTA/isms: [NIH/TOR Patented Dec. 19, 1911..
PAUL BORRMANN, or EERIJN, GERMANY.
WOODEN :PROPELLER Specification of Letters Patent.
` Patented Dec. 19, 1911.
Application filed February 7, 1911. Serial No. 607,037.
4To all lwhom it may concern:
-Be it known that I, PAUL BORRMANN, a subject of the German Emperor, and residing at Berlin, Germany, have invented certain new and useful Improvements in Wooden Propellers, of which the following is a specification. v My invention relates to wooden propellers for airships, flying-machines and the like.
Wooden propellers for aerial craft are already well-known having blades comprising narrow boards running in the direction of the blades. In these propellers the boards are superposed in the shape of a fan and then glued together in layers at right angles to the axis of rotation, whereupon they are worked into the required shape of the blade. This known mode of manufacture has various disadvantages Firstly, as is wellknown, in the case of airpropellers it is exceedingly important to make the section of the blade as thin as possible and,particu larly, to make the ends as sharp as possible. When the known mode of gluing the boards together was employed, however, after` ob taining the correct spiral shape there remained atthe outer ends of the blades so few glued joints that they could not be made as thin as was required. Secondly, it is well-known that it is preferable to make v the two blades of one propeller at a small definite angle to one another, in order to negative not only the action of centrifugal force, but also that o1 the thrust of the blades. Such a slanting position of the blades could not be obtained when the propellers were made in the manner known heretofore. In this event a large portion of the outer ends of the blades would have been robbed of'its connection with the hub owing to wedge-shaped pieces being formed, there being, in addition, no continuous wood fibers running from the end of the blade to the hub.
A primary object of my inventiov is to provide a wooden propeller, to which these defects are not attached.
According to my invention the two opposite blades of apropeller consist of continuous wooden rods which run in the direction of the blades and, in contradistinction to the blades known heretofore, are glued one with another in layers parallel to the axis of rotation of the propeller. In this manner I obviate the above mentioned disadvantages and obtain, in addition, the advantage that the number of the glued joints is considerably increased just at the places subjected to the greatest breaking strain. In this manner greater strength and security from warping is obtained particularly owing to its being possible to connect together a large number of pieces of wood having the grain in various directions.
One illustrative embodiment of my invention is represented in the accompanying drawing, wherein z- Figure l is a plan of a complete propeller,
comprising two blades, Fig. 2 is a section,
enlarged, on the line AA in Fig. 1 and Fig. 3 is a plan, enlarged, showing the outer end of a blade, parts of the veneers being broken away.
Referring to the drawings, my propeller comprises a plurality of fiat wooden rods or bars a which run in a direction longitudinally of the blades proper ofthe propeller and are disposed in layers, said layers being extended in a direction parallel to the axis of rotation of the propeller. These wooden rods are made according to a templet having the form of the blade and are firmly glued together. In order to give the blades greaterstrength and stiffness, I glue on both sides of leach blade transverse veneer ZJ and over the layers, said layers being extended in a direction parallel to the axis of rotation of `the propeller, a transverse veneer arranged at right angles to the rods and glued on both sides of the blades, and a longitudinal veneer arranged at right angles to said transverse veneer glued on the latter, substantially as shown.
3. A Wooden propeller of the character In testimony whereof, l aiiix my signadescribed consisting of flat Woolden1 bari ture in the presence of two Witnesses. which run in a direction longituL ina ly o the blades proper of the propeller, and are BORRMANN glued one with another in layers, said layers Witnesses: being extended in a direction parallel Vto HENRY HASPER, the axis of rotation of the propellers. WOLDEMAR HAUPT.
Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.
US60703711A 1911-02-07 1911-02-07 Wooden propeller. Expired - Lifetime US1012507A (en)

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US60703711A US1012507A (en) 1911-02-07 1911-02-07 Wooden propeller.

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