Wednesday 15 February 2012

RC model toys - 3


Better charge battery packs


For the remote control boats, there are very different types of battery used, however this should all be charged according to the rules.

NiCd-/NiMH battery provides a constant current. This lies at about 10% of the capacitance value (C * 0.1). The charging time is standard about 14 -16 hours. When a high charging current is required, a minus-delta-voltage switch-off (analysis of the voltage drop of the load curve) or a voltage gradient switch-off (analysis of the second voltage increase at the end of the charging curve) is possessed. The changes are strongly dependent on voltage of the battery temperature and NiCd batteries are about twice as strong as with NiMH batteries. The normative end voltage discharged at 1 V / cell and the maximum voltage at the end of discharge must not be lower than 0.7 V / cell.

These batteries are initially loaded with a constant current. This is for Li-poly batteries approx. 1C  and for LiIo battery packs it is about 0.2 C. The maximum charging voltage for Li-poly battery packs is 4.2 V / cell and it must be precisely maintained. In LiIo batteries, the maximum charging voltage is 4.1 V / cell. The batteries are being charged when the charge current at the maximum charging voltage to a minimum depending on the capacity is decreased. The limit value of the voltage at the end of discharge is achieved at 2.7 V / cell. Lithium polymer is abbreviated by LiPo, abbreviation Li-poly. Lithium ion is abbreviated by LiIo, abbreviation for Li-ion.

For RC boats, these batteries are recharged like LiIo or LiPo batteries. The maximum charging voltage is 3.7 V /cell and it is also held to an accuracy of ± 1%. The charging current can be considerably higher than 1C. The maximum allowable discharge end voltage is 2.5 V / cell. Lithium iron phosphate is abbreviated.



Regulation for Remote control Helicopter

Regulation of the Minister of Transport of 10 December 2010, 

Head of Legal Affairs (
United States), 
on the rules for flights with a model remote control helicopter (control model flying)
·              The Minister of Transport, 
acting in agreement with the Secretary of Defense; 
Having regard to Article 6.7 of the Aviation Act and Article 57 of the Air Traffic; Decision:
Article 1
·  This arrangement is meant by a model aircraft means an aircraft of small size, the total take-off mass not exceeding 25 kilograms.
Article 2
·  For a flight with a model airplane, by derogation from Chapter III of the Air Traffic, the following rules: [list: 416576ed40]

a. The flight is conducted in accordance with the general flight rules to the extent that there is no deviation in subparagraphs b to l.
b. The flight is only performed under conditions and locations where there from the ground throughout the flight visibility is on the flight model and the airspace around it; 
c. The driver maintained during the entire flight good view of the model airplane; 
d. An altimeter need not be used 
e. The prohibited objects or substances to remove during the flight, with the exception of sand, water or objects whose mass is not more than 200 grams per article as the Minister of Transport on Under Article 13 of the Air Traffic rules to be established; 
f. In other models (RC boats) or a net or cloth may be towed; 
g.  
Aerobatics may be exported 
h. Another aircraft is prohibited to approach so close that collision risk arises between the directors unless prior arrangements have been made ​​about; 
i. The driver of a model airplane takes all measures to avoid a collision and gives priority to any aircraft that is not a model airplane; 
j. For a flight is no flight plan filed; 
k. Controlled flights are not permitted; 
l. Flights are allowed up to a maximum height of 300 meters above the ground or water in Class G airspace.


How Does An Electric Model Helicopter?

To give an idea how to build an electric model remote control helicopter is a global distribution of parts and their functions:
Broadly speaking, this construction is the same for all electro with a single main rotor helicopters. In addition to the transmitter to the whole to be able to control the chopper consists essentially of the following components:
Receiver, Servos, Battery, Motor Control, Electric Motor, Gyro

Tail rotor:
The tail or chopping rotor roughly consists of the accumulated harvester rotor with heck rotor blades.

Main Rotor:
This roughly consists of the main shaft built: Swashplate, rotor wheel with paddles – pitch compensator, main rotor head with blades

A helicopter does not fly itself. As above all be seen flying a model helicopter is not self.
As a layman may seem that being a little spinning rotor quickly yields a good flying helicopter. However, by thinking a little further you soon came to the conclusion that for such a helicopter flying well and certainly not least well controlled to get a little more is needed. To give an idea, here is an overview of what is so and to such a model helicopter is. In order to give an idea how it works, there is a bit to describe that an insight arises from the whole and its functionality. It starts with the fact that a helicopter can be steered in any direction. The steering of the helicopter is controlled with the responses to the control systems.

It requires some exercises to stick with a transmitter perform then the signal is transmitted to the helicopter transmission system to make the movement. When controlling the movement e.g. reels (left-right) or pitch (high-low) by separating single channel brake from the regulation of the height, you note that this exercise takes place by controlling the pitch (more on this later), and not by controlling the motor speed. The RC boats also work on some of same rules.

Information On Remote Control Helicopter

The number of channels on the transmitter that is needed to fly a remote control helicopter varies slightly in composition as a starting point, but should soon think of at least six channels to not get into trouble. It is then considered separately regulate engine speed and gyro sensitivity on the transmitter.

Function of the transmitter: 
The transmitter converts the steering movements of the stick on the transmitter to a combined electrical signal and sends it out. The number of "channels" on a channel determined how many different possibilities. For each to control movement is a channel requires and in the channel, these channels are combined into a single signal, which is then emitted. 

The modern channels are becoming more extensive in possibilities. In the control software of the transmitter is increasingly software settings can be programmed, which in the past in a mechanical way to stand to come. Consider for example the combination of steering movements, so that a movement more things at once can be controlled. 

It is also sometimes possible to have multiple models (rc boats or helicopters) each station in the store and through a menu to choose a model, which then only one transmitter is needed for several models. When flying in the Netherlands relevant to safety in the 35 MHz band a number of channels available specifically designed to model flying. The 40 Mhz band is more generally meant for all models not only flying and is increasingly being used for the 2.4 Ghz model control.

The layout of the steering on the transmitter:
The classification of these maneuvers on the transmitter are many ways be classified and are a bit depending on how someone this self as useful experience. Usually it is based on a number of "standard" formats to choose from is to keep everything a little universal.  They are expressed in so-called "stick mode". 

Basic Information On RC Helicopter Flying

Function of the receiver: 
The receiver picks up the transmitted by the transmitter electrical signal to split this up for the different "channels" or steering movements and displays them on to servos that the movement is paired. If one wants so that all channels on the transmitter to be used, there must be at the receiver is at least as many outputs servo present.
Function of the servo: 
The servo set by the receiver to provide control signal into a mechanical movement, which then can be coupled to a control function on the remote control helicopter. In this helicopter, four servos used for the helicopter to control one for the tail to control, and three for the main rotor movement to be controlled. Also on one of the outputs of the servo motor controller directly to the recipient is closed for controlling the electric motor.

Function of the battery: 
The battery is used in rc boats for power supply of the electric and sometimes depending on the type of motor controller and size of the battery for the steam supply to the receiver, servos and gyro. If the latter is the case you need a motor controller is provided with a so-called BEC (Battery Elimination Circuit) later find more. The battery consists of a number of interconnected cells of nominally 1.2 volts per cell, when using a Nickel cadmium or nickel metal hydride battery. Case of a lithium polymer battery is the cell voltage at 3.7 volts nominal. 

The number of cells connected in succession determines the total voltage of the battery. The amount of current that the battery can deliver is expressed in mili ampere per hour (mAh) or ampere hour (Ah), (1 Ampere is equal to 1000 mA), which is the maximum current that the battery can be used for 1 hour to make. 

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