Flying object with tandem rotors

Abstract

A flying object with tandem rotors, in particular a helicopter, has a main rotor and a tandem rotor each with propeller blades which are driven by a rotor shaft and which is hinge-mounted to this rotor shaft. The angle between the surface of rotation of the main rotor and the rotor shaft may vary. A swinging manner on an oscillatory shaft is essentially transverse to the rotor shaft of the main rotor and is directed transversally to the longitudinal axis of the vanes. The main rotor and the tandem rotor each have an auxiliary rotor connected respectively to the main rotor and tandem rotor by a mechanical link. The swinging motions of the auxiliary rotor controls the angle of incidence (A) of at least one of the propeller blades of the main rotor and tandem rotor. There is an acute angle of displacement when viewing the propeller blades relative to the vanes in a direction perpendicular to their respective rotational planes.

1 . A remote control toy helicopter comprising:
 a body;   a main rotor with propeller blades driven by a first rotor shaft on which the blades are mounted, and a main motor for rotating the main rotor;   a tandem rotor with propeller blades driven by a second rotor shaft mounted at a distance relative to the first rotor shaft, and a tandem motor for rotating the tandem rotor;   an auxiliary rotor driven by the first rotor shaft of the main rotor in the same sense of rotation of the main rotor;   the auxiliary rotor being mounted in a swinging relationship on an oscillatory shaft and the swinging motion being relatively upwardly and downwardly about the oscillatory shaft, and which oscillatory shaft is provided essentially transverse to the rotor shaft of the main rotor;   the main rotor and the auxiliary rotor being connected to each other by a mechanical link, such that the swinging motion of the auxiliary rotor controls the angle of incidence of at least one of the propeller blades of the main rotor;   the first rotor shaft and the tandem rotor shaft being essentially upwardly directed and the plane of rotation of the main rotor propeller blades and the tandem rotor propeller blades being essentially to create upward lift; and the diameter of the propeller blades of the main rotor and the propeller blades of the tandem rotor being about equal;   wherein the main rotor and the tandem rotor rotate in the same direction; and   a battery for the main rotor and tandem rotor, and the main rotor and the tandem rotor being controllable by a remote controller remote from the body.   
   
   
       2 . A helicopter as claimed in  claim 1 , wherein the body includes a front end and the extent of the body at the front end is substantially at the same position as the outer circumferential position of the main rotor, and wherein the body includes a rear end and the extent of the body at the rear end is substantially the same position as the outer circumferential position of the tandem rotor. 
   
   
       3 . A helicopter as claimed in  claim 1 , wherein the body includes a rear end and the extent of the body at the rear end is substantially the same position as the outer circumferential position of the tandem rotor. 
   
   
       4 . A helicopter as claimed in  claim 1 , wherein at least one of the first rotor shaft for the main rotor or the second rotor shaft for the tandem rotor is relatively inclined in relation to a vertical axis through the body, the inclination being opposite to each other relative to the vertical axis, and including a linkage between the first rotor shaft and the tandem rotor shaft and including a motor for moving the linkage whereby the relative angle of the first rotor shaft and the second rotor shaft is selectively variable relative to the vertical axis. 
   
   
       5 . A helicopter according to  claim 1 , wherein the auxiliary rotor includes elongated members, the elongated members being for driven for rotation with the first rotor, and wherein the elongated members have a generally longitudinal axis located at an acute angle relative to a generally longitudinal axis of one of the respective propeller blades of the main rotor, and wherein each propeller blade has a profile wherein along the direction of its generally longitudinal axis of each propeller blade there is a first longitudinal convex curve from a position towards the first rotor shaft to a position towards an end area of the blade. 
   
   
       6 . A helicopter according to  claim 1 , including an auxiliary rotor driven by the second rotor shaft of the tandem rotor in the sense of rotation of the tandem rotor, the auxiliary rotor of the tandem rotor being mounted in a swinging relationship on an oscillatory shaft and the swinging motion being relatively upwardly and downwardly about the oscillatory shaft, and which oscillatory shaft is provided essentially transverse to the rotor shaft of the tandem rotor, the tandem rotor and the auxiliary rotor being connected to each other by a mechanical link, such that the swinging motion of the auxiliary rotor controls the angle of incidence of at least one of the propeller blades of the tandem rotor. 
   
   
       7 . A helicopter according to  claim 1 , wherein the main rotor and tandem rotor each include two propeller blades, the blades of each rotor being situated essentially in line with each other, and the two blades for each rotor being elongated, and wherein each propeller blade includes a transverse convex curve in a profile on its top face from a position towards a leading edge towards a position towards a trailing edge, and a transverse convex curve preferably being present over a substantial generally longitudinal length of the blade. 
   
   
       8 . A helicopter according to  claim 7 , wherein each propeller blade includes a transverse concave curve in a profile on its bottom face from a position towards a leading edge towards a position towards a trailing edge, and the transverse convex curve preferably being present over a substantial generally longitudinal length of the blade. 
   
   
       9 . A helicopter as claimed in  claim 1 , wherein at least one of the rotor shaft for the main rotor or the rotor shaft for the tandem rotor is relatively inclined in relation to a vertical axis through the body, and including a motor for changing the axis of the first rotor shaft or the second rotor shaft, whereby the relative angle of the first rotor shaft or the second rotor shaft is selectively variable relative to the vertical axis. 
   
   
       10 . A helicopter as claimed in  claim 1 , wherein the first shaft and the second shaft are relatively inclined to the vertical axis through the body, and wherein the inclination of the first rotor shaft and the second rotor shaft are oppositely inclined relative to the vertical axis and including a motor for changing the axis of the first rotor shaft or the second rotor shaft, whereby the relative angle of the first rotor shaft or the second rotor shaft is selectively variable relative to the vertical axis. 
   
   
       11 . A remote control toy helicopter comprising:
 a body;   a main rotor with propeller blades which is driven by a first rotor shaft and which is mounted on the first rotor shaft, and a main motor for rotating the main rotor;   a first auxiliary rotor operable with the main rotor, the auxiliary rotor being provided with two elongated members, the motion of the first auxiliary rotor controlling the angle of incidence of at least one of the propeller blades of the main rotor;   a tandem rotor with propeller blades driven by a second rotor shaft mounted at a distance relative to the rotor shaft of the main rotor, and a tandem motor for rotating the tandem rotor;   a second auxiliary rotor with the tandem rotor, and the second auxiliary rotor being provided with two elongated members, the motion of the second auxiliary rotor controlling the angle of incidence of at least one of the propeller blades of the tandem rotor;   wherein the body or an extension of the body extends substantially to the circumferential end of the main rotor and the circumferential end of tandem rotor; and   a battery for the main rotor and tandem rotor, and the main rotor and the tandem rotor being controllable by a remote controller remote from the body   
   
   
       12 . A helicopter according to  claim 11 , wherein the main rotor and the tandem rotor rotate in the same direction. 
   
   
       13 . A helicopter according to  claim 11 , wherein the first and second auxiliary rotors are mounted such that the longitudinal axis of one of the propeller blades of the main rotor and tandem rotor is located relative to the longitudinal axis of the respective elongated members of the first and second auxiliary rotors, such that the acute angle between the plane of rotation of the main rotor and the first rotor shaft and the tandem rotor and the second rotor shaft is variable; and wherein the longitudinal axis of one of the propeller blades of the main rotor and tandem rotor is located at an acute angle relative to the longitudinal axis of a respective elongated member of the first and second auxiliary rotor, and wherein the main rotor and the tandem rotor rotate in the same direction. 
   
   
       14 . A helicopter according to  claim 11 , wherein the auxiliary rotors respectively include elongated members, the elongated members being for driven for rotation with the first rotor, and wherein the elongated members have a generally longitudinal axis located at an acute angle relative to a generally longitudinal axis of one of the respective propeller blades of the main rotor and tandem rotor, and wherein each propeller blade has a profile wherein along the direction of its generally longitudinal axis of each propeller blade there is a first longitudinal convex curve from a position towards the first rotor shaft to a position towards an end area of the blade and wherein the main rotor and the tandem rotor rotate in the same direction. 
   
   
       15 . A helicopter according to  claim 11 , wherein the main rotor and tandem rotor each include two propeller blades, the blades of each rotor being situated essentially in line with each other, and the two blades for each rotor being elongated, and wherein each propeller blade includes a transverse convex curve in a profile on its top face from a position towards a leading edge towards a position towards a trailing edge, and the transverse convex curve preferably being present over a substantial generally longitudinal length of the blade and wherein the main rotor and the tandem rotor rotate in the same direction. 
   
   
       16 . A helicopter as claimed in  claim 11 , wherein at least one of the first rotor shaft for the main rotor or the second rotor shaft for the tandem rotor is relatively inclined in relation to a vertical axis through the body. 
   
   
       17 . A helicopter as claimed in  claim 11 , wherein the first shaft and the second shaft are relatively inclined to the vertical axis through the body, and wherein the inclination of the first rotor shaft and the second rotor shaft are oppositely inclined relative to the vertical axis, and including a motor for changing the axis of the first rotor shaft or the second rotor shaft, whereby the relative angle of the first rotor shaft or the second rotor shaft is selectively variable relative to the vertical axis. 
   
   
       18 . A remote control toy helicopter comprising:
 a body;   a main rotor with propeller blades which is driven by a first rotor shaft and which is mounted on the first rotor shaft, and a main motor for rotating the main rotor;   a first auxiliary rotor operable with the main rotor, the auxiliary rotor being provided with two elongated members, the motion of the first auxiliary rotor controlling the angle of incidence of at least one of the propeller blades of the main rotor;   a tandem rotor with propeller blades driven by a second rotor shaft mounted at a distance relative to the rotor shaft of the main rotor, and a tandem motor for rotating the tandem rotor;   a second auxiliary rotor with the tandem rotor, and the second auxiliary rotor being provided with two elongated members, the motion of the second auxiliary rotor controlling the angle of incidence of at least one of the propeller blades of the tandem rotor;   wherein the body or an extension of the body extends substantially to the circumferential end of the main rotor and the circumferential end of tandem rotor,   a battery for the main rotor and tandem rotor, and the main rotor and the tandem rotor being controllable by a remote controller remote from the body; and   wherein the first shaft and the second shaft are relatively inclined to the vertical axis through the body, and wherein the inclination of the first rotor shaft and the second rotor shaft are oppositely inclined relative to the vertical axis, and including a third motor for changing the axis of the first rotor shaft or the second rotor shaft, whereby the relative angle of the first rotor shaft or the second rotor shaft is selectively variable relative to the vertical axis, and wherein the third motor is located relatively closer to either the first rotor shaft or the second rotor shaft.