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
  • A63H27/12—Helicopters ; Flying tops

Definitions

• the present invention relates to an airborne craft consisting of a propeller capable of being driven by a drive source and a skeleton body by which the drive propeller is supported in such a way as to be free to move.
• the object of the present invention is in the first place to propose an airborne craft of the kind referred to above which has the ability to return to its starting point, like a boomerang, after having described a circular course on its flight through the air.
• an airborne craft in accordance with the present invention which is characterized essentially in that a brake rudder attached to the skeleton body, which brake rudder is mounted coaxially in relation to said drive propeller is so arranged as to be rotated relative to i ⁇ e drive propeller when the craft is driven through the air, so that the brake rudder controls the shaft about which the drive propeller is rotated and generates lift for the craft.
• Fig. 1 shows an airborne craft in a state ready for launching, with a "charged" drive source;
• Fig. 2 shows the craft viewed from above at an angle;
• Fig. 3 shows the craft viewed from below at an angle
• Fig. 4 shows a part of the craft
• Fig. 5 shows in diagrammatic form the propellers of the craft in a sectional view
• Fig. 6 shows a variant of an airborne craft with an internal combustion engine
• Fig. 7 illustrates the possible course of the craft in diagrammatic form with the distances concerned.
• the airborne craft 1 illustrated in the drawings in Figs. 1—5 consists of a skeleton body 2 which is preferably capable of being constructed easily from a number of frame components, such as- a number of tubes 3, 4, rods or similar, which are capable of being connected together with an upper and a lower part 5, 6 of the body, which skeleton body supports a propeller 8 capable of being driven by a drive source 7 in such a way as to be free to move.
• a brake rudder 9 is attached to said upper part 5 of the skeleton body or to some other appropriate part of the skeleton body 2 and is supported coaxially in relation to said drive propeller 8 on its under side 8A.
• the brake rudder 9 extends, when viewed in the radial sense in relation to the axis of rotation of said propeller, outside the drive propeller 8, that is to say it extends beyond the extreme end parts 10, 11 of the drive propeller.
• Said so—called brake rudder 9 is so arranged as to be rotated relative to the drive propeller 8 when the airborne craft 1 is driven through the air.
• the drive propeller 8 and the brake rudder 9 exhibit preferably an essentially plane under side 8A and 9A, 9B, and the drive propeller 8 preferably exhibits a wing profile with an upper side 8B which is in the form of a curve, preferably with an essentially even curved shape, that is to say the propeller 8 reduces in thickness from its central area 8 " * towards its side edges 8 2 , 8 3 .
• the drive propeller 8 exhibits at least two evenly distributed drive propeller parts 8 A , 8 B projecting from the axis of rotation 13 of the hub in a direction away from a common hub 12 in an essentially radial sense and at a certain angle A, preferably approximately 5°, in relation to the brake rudder Said parts 8 A , 8 B of the drive propeller are preferably so arranged as to be capable of adjustment to a desired angle B such that said parts 8 A , 8 B are inclined at the desired angle of inclination B between their respective under side 8 and a horizontal plane 14 when the craft 1 is held in an upright position with its propeller shaft 13 extending vertically.
• An appropriate angle of rotation of the blade is between approximately 15 and 20°.
• the parts 8 A , 8 B of the drive propeller can, for example, be locked in a desired, set angular position by means of locking screws 15 which are accommodated in threaded holes 16 on the inner ends 17, 18 of the parts, so that the screws 15 can lock the parts 8 A , 8 B of the drive propeller to a rigid shaft 19, 20 which projects radially from the hub 12, which shaft 19, 20 and the part 8 A , 8 B of the drive propeller are accommodated for a certain distance inside a matching accommodating space 21.
• the brake rudder 9 which similarly consists of at least two blades, exhibits a recessed part 22 along its upper side 9C, which brake rudder, when viewed along the radial extent of the propeller, is at least matched by the radial extent of the drive propeller.
• the two blades 8, 9 are thus so arranged as to extend alongside one another and at a not excessively great distance from one another.
• the brake rudder 9 appropriately tapers at its respective ends 24, 25 in a curved fashion so as to form an arrow—shaped tip with a rounded outer part.
• Said brake rudder 9 is also capable of angular adjustment relative to its associated supporting shaft 26, 27, so that said brake rudder parts 9 A , 9 B are adjusted to a desired brake angle C in relation to an imaginary horizontal plane 28 which extends through the part 29 of the rotating shafts of said parts when the craft 1 is held in the aforementioned upright position, as illustrated in Figs. 2 and 3.
• the appropriate angle C can be varied between 50 and 120°, for example, in conjunction with which the optimum angle C appears to be approximately 50°, that is to say the craft 1 will describe its maximum course at this angle.
• Said adjustability may be afforded, for example, by means of connecting joints 32, 33 between said supporting shafts 26, 27 and propeller rotating shafts 30, 31, which are securely attached to the respective brake propeller parts 9 A , 9 B and extend closely along said recessed part 22 in the brake rudder 9.
• Said connecting joints 32, 33 may, for example, consist of sleeves or similar telescopic joints made of a plastics material, for example, which allow a part of each of said propeller rotating shafts 30, 31 to be accommodated for the purpose of clamping same securely in the desired angular position.
• the tubes 3, 4, etc., which form said skeleton body 2 can be capable of attachment to the respective upper and lower part 5, 6 of the skeleton body preferably by being capable of being accommodated with their respective ends 3A, 3B, 4A, 4B by appropriate connection sleeves 34, 35, 36, 37 which project from the associated part 5, 6 of the body.
• attachments 38, 39 can be supported by the respective part 5, 6 of the body.
• One 39 of said two attachments 38, 39 is capable of being attached to the drive propeller 8, and preferably of being securely connected to the rotating shaft 13 of the hub, whilst the other attachment 38 is rigidly connected to the lower part 6 of the body.
• Said attachment 39 which is connected to the shaft
• Tables relate to two drive propellers 8 which exhibit different blade inclination angles B, of approximately 20° and approximately 15° respectively, in conjunction with which reference is made to Fig. 7, in which the various values indicated in the Tables are marked along the intended calculated course of the craft between its starting point 0 and its landing point, which in the best possible case is the same as the starting point 0, which shall be understood to denote that the distance A is 0 metres if the craft is so arranged as to return to its starting point 0 after having described a circular course, as shown by the arrows.
• Table 1 Drive propeller with blade inclination angle (B) of approximately 20°.
• Table 2 Drive pi "opeller with bl, -de inc angle (B) of approximately 15°.
• the drive propeller arrangement outlined above functions in accordance with two main principles in order to cause the airborne craft 1 to fly and to return to its starting point; i.e.:
• a drive effect produces a curved course through interaction between the drive propeller 8 and the brake rudder
• the brake rudder 9 together with the rest of the craft will be caused to rotate in a clockwise direction 48, which is the case in the illustrative embodiment described above and shown in the drawings.
• the craft 1 will accordingly fly along a circular course in a clockwise direction, as shown in Fig. 7.
• the brake rudder 9 will be caused to rotate in an anti—clockwise direction 47, and the craft will fly along a circular course in an anti—clockwise direction 47.
• a pendulum effect achieved through the mass of the craft.
• the drive source 7 consisting of rubber bands 7A, 7B, these are designed so that the craft 1 will fly and return to its starting place after the energy of the rubber bands is spent.
• the craft 1 is thus imparted with precisely the pulse effect required for this purpose, and by selecting precise angles B, C for the drive propeller 8 and the brake rudder 9, and by inclining the craft 1 at a certain angle D in relation to the horizontal plane, it is possible for the craft to fly along a circular course and also to return to the starting point of the craft.
• the brake rudder 9, which can be adjusted to the desired angle C, as shown in Fig. 5, should be as light and strong as possible, with a suitable material being plastic, light alloy or some other lightweight wooden material, this requirement being equally applicable to the drive propeller 8.
• the brake rudder 9 functions as a propeller when it is set to an angular adjustment C at an advantageous angle of approximately 50°, for example, which propeller helps to pulse the craft 1 and thus to maintain it in its initial position, as shown in Fig. 1 by an angle of inclination D° of approximately 60°, for example, so that the craft can fly over a maximum distance D(m) from the starting place and can then return to the starting place.
• the brake rudder 9 with its angular adjustment C of approximately 110° causes it to function as a negative propeller, which removes the pulse effect and influences the craft in such a way that its angle of inclination D° is changed rapidly from its initial position, and which causes the craft 1 to fly over a reduced distance DCm) but still to return to its starting place. It is important to point out that, if the brake rudder 9 is situated above the centre of gravity of the craft, it will cause the craft to move downwards, and vice versa in the opposite position.
• Suitable bearings preferably good quality roller bearings, should thus be used as the bearing for the drive propeller 8.
• the edges of the propellers may be rounded.
• the craft 101 shown in Fig. 6 differs from the previously described craft 1 primarily with regard to the design of its drive propeller 108 and body 102 and the choice of power source
• the drive propeller 108 exhibits three blade parts
• this craft 101 is the same as that of the previously described craft 1, except for the fact that the craft 101 can fly for longer distances thanks to the presence of the motor 107 powered by liquid fuel.

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• Braking Arrangements (AREA)
• Toys (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20363873

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Citations (5)

• 1986
  • 1986-03-18 SE SE8601255A patent/SE457329B/xx not_active IP Right Cessation
• 1987
  • 1987-03-17 WO PCT/SE1987/000135 patent/WO1987005528A1/en unknown
  • 1987-03-17 AU AU71245/87A patent/AU7124587A/en not_active Abandoned
  • 1987-03-18 CN CN198787102203A patent/CN87102203A/zh active Pending

Patent Citations (5)

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