JPS6217116Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a speed detection mechanism for a flying object in a radio-controlled vehicle, and is concerned with a mechanism that allows the flight speed of a model airplane flown by a radio-controlled vehicle to be detected at any time using a receiver on the pilot side.

With radio control, a receiver mounted on the model receives radio waves emitted from a transmitter on the control side, and a servo motor moves according to the instructions from the transmitter, thereby controlling the flying direction, speed, etc. of the model. be. The radio waves used for radio control are 40MH and
There are 2 bands for 27MH, 2 bands for 40MH, and 6 bands for 27MH, so a total of 8 bands are used. Many models have been made, including cars and motorbikes that run on the ground, as well as airplanes, helicopters, gliders, boats, ships, and yachts, but their power can be roughly divided into motors and engines. Usually, cars, boats, etc. are driven by motors, but large airplanes, etc. are equipped with engines. The direction of flight is changed by moving the steering servo or rudder servo, and the speed is changed by moving the speed control servo via a resistor to change the speed of the drive motor. If the engine is driven by an engine, the fuel control servo is moved to change the engine speed. The control distance range of radio control is usually 1
Km, so it is necessary to keep the flying object within a radius of 1 Km at all times, but engine-driven airplanes can fly at extremely high speeds, and they may fly out of the control range and become uncontrollable. The accident that it ran out was a victory. One possible way to prevent such troubles is to capture the flight speed of the aircraft and calculate how many kilometers it has flown from the control point, but there is currently no known means of detecting the speed of the aircraft at the control point. do not have. In addition, in radio-controlled competitions, for example, there is an optimum speed suitable for the curve of a car or the turning of an airplane, and if this can be detected successively, the control can be performed more accurately, but the At present, it has not yet been possible to detect flight speed sequentially.

Therefore, an object of the present invention is to provide a mechanism by which an operator can successively learn the speed of a model flying vehicle.

That is, in the present invention, a propeller is attached to a model flying object so that it can freely rotate by protruding forward from the main body, and a sensor (hereinafter referred to as CDS) that detects the interruption of light due to the rotation of the propeller is installed near the propeller. , equipped with a transmitter that converts the propeller rotation speed output from the CDS into a pulse signal and transmits it, and a separate receiver that converts the signal sent from the transmitter into the rotation speed and displays the speed of the flying object. This is a speed detection mechanism for a flying vehicle in a radio-controlled vehicle.

The present invention will be explained in detail below with reference to the drawings. FIG. 1 is a perspective view of a model airplane in which the speed-detecting propeller of the present invention is attached to the fuselage. In Fig. 1, a model airplane 1 has built-in engines, receivers, servo motors, batteries, etc. (all not shown) that would normally be installed, and the front part of the right wing 2 has a built-in engine, receiver, servo motor, battery, etc. A propeller 3 for speed detection is protruding from the top and is freely rotatable.
A CDS 4 is installed behind the propeller 3. In addition, there is a transmitter (not shown) in the aircraft that converts the rotation speed output from CDS4 into a pulse signal and transmits it.
is built-in.

FIG. 2 is an enlarged side sectional view of the speed detection propeller section, FIG. 3 is a view taken along the line B-B in FIG. 2, and FIG. 4 is a view taken along the line A-A in FIG. 2 to 4, a propeller mounting base 5 is screwed to the front part of the right wing 2 of a model airplane with bolts 6 and nuts 7. The propeller mounting base 5 has a screw 8 carved into the tip of a cylinder, and a cylinder 8' with a smaller diameter protrudes from the tip, and wing-shaped plates 5' extend horizontally on both sides of the large diameter cylinder. The central part of this plate can be screwed in with a bolt. A stay 9 is screwed onto the screw 8 of the propeller mounting base 5. The stay 9 is composed of a cylindrical propeller bearing rod 10, a CDS receptor 11 located below the propeller bearing rod 10, and a support plate 12 that supports these.
A speed detection propeller 3 is attached via 3 so as to be freely rotatable. In addition, CDS receptor 11
The CDS 4 is housed with the sensing section 14 facing the propeller, and the cord 15 passes through the right wing 2 and is connected to a transmitter (not shown) inside the aircraft.

FIG. 5 is a circuit diagram of the transmitter, which is composed of a pulse conversion circuit 16 that converts the intermittent light (rotation speed) sent from the CDS 4 into a pulse signal and a transmitter circuit 17 that transmits this pulse signal.

Next, the operating status of the present invention will be explained.

A model airplane flying by a known method experiences air resistance at the speed detection propeller 3, so this propeller rotates at a rotational speed corresponding to the flight speed (more precisely, the air speed). On the other hand, since the CDS 4 is installed in a straight line of the propeller 3 with the sensing part 14 facing the propeller, it can accurately sense the intermittent light that changes every time the propeller passes in front of the sensing part 14, and the rotation of the propeller Count as a number. The signal output from the CDS 4 is converted into a pulse signal by a pulse conversion circuit 16 on the transmitter side, and further transmitted to the ground via a transmission circuit 17. The pilot's receiver catches this signal, converts the pulse signal into rotational speed,
Furthermore, it is replaced with a speedometer and displayed as flight speed.

In this invention, the transmitter installed on the flying vehicle is
It can be incorporated into the transmitter mounted for maneuvering, and the receiver on the ground side can also be incorporated into the transmitter for maneuvering. The mounting position of the speed detection propeller is not particularly limited as long as it is not affected by turbulence generated in front of it, such as the wake of the propeller caused by the forward and backward propeller or the turbulence generated by the aircraft body. The shape may be any shape as long as it can be rotated by air resistance. The accuracy of the speed detection mechanism of the present invention was determined through the following experiment.

[Experimental conditions]

From the bonnet to the front bumper of a passenger car
A board that protrudes from the top about 50 cm is installed vertically, the top 20 cm is formed into an airfoil shape, and a speed sensor is attached to the leading edge of the airfoil that protrudes about 5 cm forward to maintain the distance from the vehicle in front when there is no wind on the highway. I drove more than 300m away.

At this time, in order to eliminate errors in the car's speedometer, the speedometer was calibrated accurately as follows. There are distance markers on the expressway every 100 meters, and we used these to measure the number of seconds it took to cover 1 kilometer, converting it to per hour and using it as the standard speed.

[Experiment details] Various experiments were conducted to determine how the airflow would be turbulent and the speed indication would change depending on the mounting position of the speed sensor on the car body due to the influence of the running car body. As a result, regardless of whether the sensor was installed on the driver's seat side, the passenger side, or the front of the bonnet, the speed indication would be the same no matter how far it was from the car body, as long as it was at least 40 cm away from the car body. As a result of the experiment, 40cm
If it is too far away, it is thought that the turbulence of airflow caused by the car body while driving will be outside the scope of the problem.

As long as the shape of the sensor mounting part was roughly airfoil-shaped, no errors would occur even if the shape and size changed. The reason why there is no error is 5cm from the leading edge.
Because the sensor is mounted so that it protrudes forward, it is outside the turbulence of airflow caused by the wings and is thought to be unaffected.

When the mechanism of the present invention was installed in a model airplane, the error between the speedometer reading and the actual flight speed was investigated as follows. Marks are placed on the ground at 200m intervals, a model airplane equipped with the mechanism of the present invention is flown back and forth between the marks, the number of seconds it takes the model airplane to pass is counted, and the actual speed is calculated by converting it to per hour. Compare with the speedometer reading of the mechanism.

The results were accurate enough for practical use (error in speed display within ±5%).

Since the speed detection mechanism of the present invention has the above-described configuration, it has the following advantages.

(1) Conventionally, the speed of a model flying object was calculated by measuring the time it took to pass through a fixed straight section, but with the present invention, the instantaneous speed can be continuously detected regardless of the flying condition. This not only increases the feeling of riding, but also provides a clue as to how far the flying object is from the pilot, which can prevent troubles such as loss of control.

(2) The structure is a combination of a small propeller and a CDS, and the transmission and reception mechanisms are sufficient, so conventional radio controls can be used as is.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the model airplane, Fig. 2 is an enlarged side sectional view of the speed detection propeller section, Fig. 3 is a view taken along the line B-B in Fig. 2, and Fig. 4 is a view taken along the line A-A in Fig. 2. The top view, FIG. 5, is a circuit diagram of the transmitter. 1...Model airplane, 2...Right wing, 3...Speed detection propeller, 4...CDS, 5...Propeller mounting base, 5'...Plate, 6...Bolt, 7...Nut, 8... Screw, 8'...Cylinder, 9...Stay,
10... Propeller bearing rod, 11... CDS receptor, 12... Support plate, 13... Propeller shaft, 14
... Sensing section, 15 ... Code, 16 ... Pulse conversion circuit, 17 ... Transmission circuit.

Claims (1)

[Scope of utility model registration request] A propeller is attached to the model flying vehicle so that it can freely rotate by protruding forward from the main body, and a sensor is installed near the propeller to detect the interruption of light due to the rotation of the propeller, and the propeller rotation speed output from the sensor is pulsed. A radio-controlled flying object that is equipped with a transmitter that converts the signal into a signal and transmits it, and a separate receiver that converts the signal sent from the transmitter into a rotational speed and displays the speed of the flying object. speed detection mechanism.