There are special digital stations in the market to pilot helicopters, with features that improve the management of these devices. These stations tend to be medium or high range and eliminates interference from stray producing the helicopter at close range ( due to the movement of many metal parts ) .
The minimum number of channels required to handle a helicopter are four, although much of the helicopters need 5 channels. In addition to these five , a sixth channel is often used to regulate the gyroscope . Consequently , the special stations for helicopters have 6 or 7 channels.
Features 308×350 helis station stations rc helicopter
A channel will act in the longitudinal cyclic to tilt the helicopter forward or backward (on a plane is the depth ) , while another channel is used by the transverse cyclic tilting the helicopter to one side or the other (on a plane are ailerons ) .
Another channel acting on the tail rotor causing the helicopter to rotate about its vertical axis in one direction or another ( in the plane is derived.)
The engine is also regulated by another channel as in an aircraft radio .
Another essential function in modern rc helicopter is the collective pitch that varies the angle of attack of the main rotor blades , regardless of cyclic pitch . By increasing over the helicopter go up and vice versa. Increasing collective pitch must be accompanied by an increase in engine acceleration coordinated.
This feature is one of the key roles in a radio helicopters.
Mixing function step / motor
This feature greatly facilitates piloting a helicopter since the variation of the motor function of blade pitch does not behave linearly for each engine speed and stable rotor.
A normal helicopter requires a minimum pitch of between 2 and 4 degrees negative . Do a stationary positive about 5 degrees and the maximum step is about 8 degrees positive . The carburetor opening will be located in the middle and go from 5 to 8 degrees collective gas must be fully open .
In normal flight , the minimum step , the engine must run with a fast idle.
That is, the engine carburetor as you move the stick forward the station will open little at first and increasingly at the end.
The radios can be configured helicopter servo displacement gas and function of collective pitch stick movement . Although a single stick is used in the station, it has two trims ( casters ) separated to act quickly and conveniently on the gas mixture and collective pitch way .
At later exponential stations available to regulate the amount of displacement of the servo involved in either direction ( ATV function ) .
This way you can properly configure the operation of these servos to hover as getting satisfactory ( ” Hovering pitch” and ” Hovering throttle” ) .
Tail mixing function
The mixing function or anti-torque tail is specific helicopter stations . Its function is to correct the tendency of the helicopter to turn to changes in collective pitch . When the helicopter flies , the torque produced by the engine causes the main rotor to rotate in one direction while the rest of the helicopter tends to rotate in the opposite direction (according to the law of action-reaction physics ) . This force must be balanced by varying the pitch of the tail rotor blades . The variation of this step should be adapted to the collective pitch : if the gas and step increases , you must increase the pitch of the tail rotor blades , and otherwise, must decrease.
This coordination is done by a mixer that handles the tail rotor independently and also if you get the order of the stick of the transmitter to turn tail , do it.
This action complements the transmitter gyro tail if it detects a change in the tail that is not ordered by the station acts on the tail rotor counteracting the action.
The stations usually have 3 positions for the glue mix . You can also set your tabs to the main rotor . They also have two potentiometers “Revo up” and ” down Revo ” corresponding to the mixture between stationary and maximum pitch tail rotor , and stationary and minimum pitch of the tail rotor.
Pre-acceleration ( Idle- up)
The pre-acceleration is a special feature of the helicopters used to perform stunts without losing control of the device. Recall that the control system depends directly on the helicopter main rotor . When you run a looping or a barrel , the helicopter is put upside down for a few seconds . Sorry if we are not losing much height (the main rotor vents to above) , we reduce the step or apply a negative step. In normal configuration this means cutting the engine with consequent lowering of the main rotor system and loss of control of the helicopter.
This problem can be reduced thanks to the Idle- up . It is a device that allows the station has as the pitch of the blades is to specify how slow the main rotor is reduced.
Helicopters same with the engine stopped and sufficient height can land perfectly . With good training and good set , if the engine is cut in flight , it is possible to lower it to the ground and it lands softly. In fact it is one of the figures present in competitions. The “Hold” feature allows autorotation practice without the risk of breaking . When pressing the interuptor , the throttle takes a certain position such idle and you can practice autorotation . At the desired time you can return to action and regain control of the motor. Potentiometers available to regulate the speed of rotation of the rotor in the “Hold” position .