US1667506A - Propeller - Google Patents

Propeller Download PDF

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Publication number
US1667506A
US1667506A US167233A US16723327A US1667506A US 1667506 A US1667506 A US 1667506A US 167233 A US167233 A US 167233A US 16723327 A US16723327 A US 16723327A US 1667506 A US1667506 A US 1667506A
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United States
Prior art keywords
blades
hub
propeller
fluid
vacuum
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Expired - Lifetime
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US167233A
Inventor
John S Bankrat
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Individual
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Individual
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Priority to US167233A priority Critical patent/US1667506A/en
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Publication of US1667506A publication Critical patent/US1667506A/en
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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
    • B64C11/24—Hollow 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/914—Device to control boundary layer

Definitions

  • My invention relates to airplane or boat propellers and has a particular reference to propellers provided with internal passages for the fluid in which the propeller operates.
  • Fig. 1 is a sectionalelevation of my prop eller (showing portions only of the blades),
  • .ig. 2 is a top view of same, tional elevation taken endwise
  • the front portion of the hub is made hollow being provided. with a circular cavity 4.
  • Blades 5 are attached to the hub. These blades are made hollow inside with cavities 6 in communication with the cavity 4.
  • a plurality of small holes 7 are provided in the rear portion of the blades at points where the undesirable vacuum is likely to be formed (Fig. 4).
  • the hub has reinforcing straight webs 8 between the blades and, spiral guiding webs 9 directing the air to the inner port-ions of the blades as shown with arrows '10.
  • the total area of the holes 7 issmaller than the cross-sectional area of the hub cavity, so that the air in the blade cavities willbe under a certain amount of pressure.
  • FIG. 4 illustrates the action of my pro-
  • the blade 5 (shown in section) moves in direction of an arrow 11 under action of the motor (the movement ofrotation), the movement of translation bemg indicated with an arrow 12.
  • An undesirable Fig. 3 is a secvacuum 13 is formed at the rear of the blade, tending to retard the forward movement of the propeller. ever, with streams 14 of the'fluid under pressure. This fluid in case of an airplane is air and for boats'water.
  • this vacuum depends to a large extent on. the velocity of the movement of translation, and. with my arrangement this velocity also increases the fluid pressure in the blades and, consequently, the yelo'city of the fluid streams 14. This action is entirely automatic, more fluid being admitted to the rear of the blades when more vacuum is formed.
  • a suitable apparatus such as a blower, pump or engine exhaust.
  • VV-ith ordinary propellers it is necessary to provide the hub with a sharp pointed cap in order to reduce the air (or water) resistance. With my propeller this is not neccssary, as the whole front portion of the hub which contains the cavity, practically does not offer any resistance to the translatory movement, the fluid passing freely inside.

Description

Apfil 24, 19 28.
J. s. BANKRAT PROPELLER Filed Feb. 10. 1927 JOHN 151 BA NK/PAT INVENTOR ATTORNEY gflw ' my propeller.
Patented Apr. 24', 1928.
, PATENT OFFICE.
JOHN S. BANKRAT, OF HEMPSTEAD, NEW YORK.
PROPELLEB.
Application filed February 10, 1927. Serial No. 167,233.,
My invention relates to airplane or boat propellers and has a particular reference to propellers provided with internal passages for the fluid in which the propeller operates.
In ordinary propellers there is always a certain amount of vacuum formed at the rear portion of the propeller blades which vacuum interferes with the forward movement of the propeller and reduces its efli-1 ciency. In order to obviate this difiiculty I provide my propeller with a hollow hub and internal passages through ,which the fluid is admitted under pressure inside'of the blades from which it emerges through suitably located holes located at points where vacuum usually forms.
My invention is more fully described in the accompanying specification and drawing in which- Fig. 1 is a sectionalelevation of my prop eller (showing portions only of the blades),
.ig. 2 is a top view of same, tional elevation taken endwise, and Fig. 4 is a diagrammatic view illustrating action of My propeller comprises a hub 1 mounted on a motor shaft 2 and fastened with a nut 3 (or in any other suitable manner.) The front portion of the hub is made hollow being provided. with a circular cavity 4. Blades 5 are attached to the hub. These blades are made hollow inside with cavities 6 in communication with the cavity 4. A plurality of small holes 7 are provided in the rear portion of the blades at points where the undesirable vacuum is likely to be formed (Fig. 4).
The hub has reinforcing straight webs 8 between the blades and, spiral guiding webs 9 directing the air to the inner port-ions of the blades as shown with arrows '10.
The total area of the holes 7 issmaller than the cross-sectional area of the hub cavity, so that the air in the blade cavities willbe under a certain amount of pressure.
This is necessary in order to provide a sulficient velocity to the fluid emerging from the holes 7.
Fig. peller.
4 illustrates the action of my pro- The blade 5 (shown in section) moves in direction of an arrow 11 under action of the motor (the movement ofrotation), the movement of translation bemg indicated with an arrow 12. An undesirable Fig. 3 is a secvacuum 13 is formed at the rear of the blade, tending to retard the forward movement of the propeller. ever, with streams 14 of the'fluid under pressure. This fluid in case of an airplane is air and for boats'water.
The formation of this vacuum depends to a large extent on. the velocity of the movement of translation, and. with my arrangement this velocity also increases the fluid pressure in the blades and, consequently, the yelo'city of the fluid streams 14. This action is entirely automatic, more fluid being admitted to the rear of the blades when more vacuum is formed.
It is possible,
blades by means of a suitable apparatus, such as a blower, pump or engine exhaust.
VV-ith ordinary propellers it is necessary to provide the hub with a sharp pointed cap in order to reduce the air (or water) resistance. With my propeller this is not neccssary, as the whole front portion of the hub which contains the cavity, practically does not offer any resistance to the translatory movement, the fluid passing freely inside.
I claim as In invention:
In a propel er, the combination with a cylindricalhub, of means tomount said hub on a shaft, an outer cylinder concentric with of course, to assist this action by introducing additional fluid in the This vacuum is filled, howsaid hub and attached to said 'hub in the rating said clearance for said blades, and
spiral guiding surfaces in said partitions extending from the front end of said hub to .the inside of said hollow blades and forming smooth passages for air from the front of forming a circular clearance in front a said hub to the inside of said blades, said blades being provided with a plurality of small apertures in a communication with the inside of said blades and extending through the full length of said blades on one side. i
Signed at Hempstead, in the county of Nassau and State of New York this seventh day of February A. D. 1927 JOHN s. simian.
ios
US167233A 1927-02-10 1927-02-10 Propeller Expired - Lifetime US1667506A (en)

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Application Number Priority Date Filing Date Title
US167233A US1667506A (en) 1927-02-10 1927-02-10 Propeller

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US1667506A true US1667506A (en) 1928-04-24

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511156A (en) * 1946-08-07 1950-06-13 Richard J Glass Propeller
US4191506A (en) * 1977-12-20 1980-03-04 Packham Lester M Propeller and impeller constructions
US5597245A (en) * 1962-08-13 1997-01-28 The United States Of America As Represented By The Secretary Of The Navy Cavitation suppressing ducted propeller system
FR3036144A1 (en) * 2015-05-11 2016-11-18 Snecma TURBOMACHINE PROPELLER

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511156A (en) * 1946-08-07 1950-06-13 Richard J Glass Propeller
US5597245A (en) * 1962-08-13 1997-01-28 The United States Of America As Represented By The Secretary Of The Navy Cavitation suppressing ducted propeller system
US4191506A (en) * 1977-12-20 1980-03-04 Packham Lester M Propeller and impeller constructions
FR3036144A1 (en) * 2015-05-11 2016-11-18 Snecma TURBOMACHINE PROPELLER

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