EP0456882A1 - Propeller for toy aircraft - Google Patents

Propeller for toy aircraft Download PDF

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Publication number
EP0456882A1
EP0456882A1 EP90118333A EP90118333A EP0456882A1 EP 0456882 A1 EP0456882 A1 EP 0456882A1 EP 90118333 A EP90118333 A EP 90118333A EP 90118333 A EP90118333 A EP 90118333A EP 0456882 A1 EP0456882 A1 EP 0456882A1
Authority
EP
European Patent Office
Prior art keywords
blade
propeller
hub
fixed
toy aircraft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90118333A
Other languages
German (de)
English (en)
French (fr)
Inventor
Sasaki Katsuhiko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bandai Co Ltd
Original Assignee
Bandai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bandai Co Ltd filed Critical Bandai Co Ltd
Publication of EP0456882A1 publication Critical patent/EP0456882A1/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
    • A63H27/00—Toy aircraft; Other flying toys

Definitions

  • the present invention relates to a propeller for a toy aircraft. More particularly it relates to a propeller for producing a thrust on a toy aircraft.
  • Figs. 8 to 13 and Figs. 14 to 19 show known propellers 5 and 6 respectively which are provided with hubs 51, 61 for being fixed to motor shafts (not shown) and having four to five fan blades 52, 62 fixed to the hubs 51, 61 at blade angles of about 60° to 70° with respect to the axes 55, 65 of the hubs 51, 61.
  • the leading and trailing edges 53, 63 and 54, 64 of the blades are straight.
  • Figs. 20 to 23 show another known propeller 7.
  • the trailing edge 74 of the blade 72 is coplanar with the rear end of the hub 71.
  • the blade cannot catch the air sufficiently and as the result, the thrust is decreased unintentionally.
  • the trailing edge 74 of the blade 72 are coplanar with the rear end of the hub 71, it is impossible to obtain a large sweepback to prevent stall of the propeller during the flight of the toy aircraft.
  • An object of the present invention is to provide a propeller for toy aircraft which can be driven at high speed using an electric motor. Another object of the present invention is to provide a propeller for toy aircraft which can generate sufficient thrust to fly the toy aircraft.
  • the present invention is comprising;
  • the propeller for a toy aircraft in accordance with the present invention having at least three blades which rotate with a reduced resistance of the air so that the driving power of the motor can be transmitted efficiently. Furthermore, since the leading edge of the blade is curved, the fan rotates smoothly in a manner to "cut" the air, thereby further reducing the resistance produced by the air. In addition, the blades secured to the hub and twisted at an angle of about 45° to 55° with respect to the axis of the hub make it possible to have wider blades to catch the air sufficiently, thus generating a thrust large enough to propel the toy aircraft even though the number of the blades is reduced to three. Furthermore, since the trailing edge of the blade has a smaller curvature than the leading edge thereof, it is possible to obtain a large sweepback of the blade sufficient to suppress any tendency of stall of the fan during flight of the aircraft.
  • a propeller of the present invention for use in a toy aircraft is denoted by 1.
  • the propeller 1 has a hub 2 and three blades 3.
  • the hub 2 has a generally U-shaped cross section which has a open end.
  • An electric motor shaft receiving portion 22 is constructed in the hub 2 for receiving the shaft of a drive motor 43 is formed.
  • the three blades are fixed to the outer peripheral surface of the hub 2 at equal intervals.
  • Each blade 3 is shaped so as to spread or increase in width from the base end 31 towards the free end 34.
  • the line constituting leading edge 38 of the blade which interconnects the leading end 32 of the base end edge 31 and the leading end 35 of the free end edge 34 of the blade 35 is curved.
  • the line constituting trailing edge 39 of the blade which interconnects the rear end 33 of the base end edge 31 and the rear end 36 of the free end edge 34 of the blade is also curved.
  • the curvature of the leading edge 38 is larger than that of the trailing edge 39. Consequently, the width of the blade is greater at the free end edge 34 than the base end edge 31 so that a sweepback is formed at the trailing end of the free end edge 34.
  • Each blade 3 is fixed to the hub 2 and twisted at a blade angle of about 50° with respect to the axis of the hub.
  • the propeller 1 having the construction described above is attached to the output shaft 44 of a driving electric motor 43 which motor is fixed by means of stays 42 in a tubular body 41 of a toy aircraft.
  • the propeller of this embodiment encounters reduced air resistance so that the driving power of the motor 4 can effectively be transmitted at minimus loss. Furthermore, since the leading edge 38 of each blade is curved, the propeller 1 rotates smoothly in a manner to "cut" the air, whereby the resistance of air is further reduced. In addition, since the blades 3 are secured to the hub 2 and twisted at a blade angle of about 50° with respect to the axis of the hub, it is possible to make the surface of the blade 3 larger so that air is caught at a large rate to generate a large thrust.
  • the propeller 1 of this embodiment as well as the known propellers denoted by 5, 6 and 7 mentioned before in connection with Figs. 8 to 13, 14 to 19 and 20 to 23, were tested by using a electric motor driven by a power supplied from a 2.4V D.C. battery.
  • the known 4-blade propeller 5 produced a thrust of 19.1g
  • the known 5-blade propeller 6 produced a thrust of 18.75g.
  • the known propeller 7 showed only a very small thrust of 11.3g.
  • described embodiment of the propeller of the present invention showed a much greater thrust of 21.10g.
  • thrust increases in proportion to the number of the blades regardless of the resistance of the air.
  • an electric motor is used as the driving power source, since the power of the electric motor is comparatively weak, the resistance produced by the air cannot be negligible and thrust decreases substantially in propotion to the number of blades.
  • the propeller of the present invention for use in toy aircraft encounters a reduced resistance produced by air because the number of the blades is reduced to three.
  • each blade since each blade has a wider surface, each blade can catch larger amount of air than that of known propellers.
  • the propeller of the present invention can produce much greater thrust than known propellers.
  • the angle of the blades to the boss 2 is larger than that of known propeller, the blades themselves do not resist against the inflow of the air. Rather the inflow of the air accelerates the rotation of the three blades 3.
  • the sweepback formed on the trailing end 36 of the blade 3 effectively prevents stall of the propeller assisted by inflow of the air.
  • the present invention offers a propeller suitable for use in a toy aircraft and operates with an improved thrusting efficiency.

Landscapes

  • Toys (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP90118333A 1990-05-16 1990-09-24 Propeller for toy aircraft Withdrawn EP0456882A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5104290U JPH0633980Y2 (ja) 1990-05-16 1990-05-16 玩具用ダクテッドファン
JP51042/90 1990-05-16

Publications (1)

Publication Number Publication Date
EP0456882A1 true EP0456882A1 (en) 1991-11-21

Family

ID=12875746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118333A Withdrawn EP0456882A1 (en) 1990-05-16 1990-09-24 Propeller for toy aircraft

Country Status (2)

Country Link
EP (1) EP0456882A1 (enrdf_load_stackoverflow)
JP (1) JPH0633980Y2 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101314080B (zh) * 2007-05-30 2011-11-09 深圳市乐迪电子有限公司 航模飞机电动涡轮涵道系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53153958U (enrdf_load_stackoverflow) * 1977-05-09 1978-12-04

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535527A (en) * 1946-08-15 1950-12-26 Archiebald S Barkley Model airplane propeller
US2563020A (en) * 1949-05-20 1951-08-07 Walter F Gemeinhardt Propeller assembly for model airplanes
US2689617A (en) * 1951-12-10 1954-09-21 Lewis F Bouley Model airplane sectional blade propeller and adapter hub
US3796005A (en) * 1973-02-23 1974-03-12 Mattel Inc Simulated jet airplane toy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535527A (en) * 1946-08-15 1950-12-26 Archiebald S Barkley Model airplane propeller
US2563020A (en) * 1949-05-20 1951-08-07 Walter F Gemeinhardt Propeller assembly for model airplanes
US2689617A (en) * 1951-12-10 1954-09-21 Lewis F Bouley Model airplane sectional blade propeller and adapter hub
US3796005A (en) * 1973-02-23 1974-03-12 Mattel Inc Simulated jet airplane toy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101314080B (zh) * 2007-05-30 2011-11-09 深圳市乐迪电子有限公司 航模飞机电动涡轮涵道系统

Also Published As

Publication number Publication date
JPH0633980Y2 (ja) 1994-09-07
JPH0411096U (enrdf_load_stackoverflow) 1992-01-29

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