Showing posts from April, 2017

Beginners Guide Part 6 - Your First Airplane

Choosing your first airplane
First, do not allow yourself to be easily discouraged. This is a hobby for people with patience and persistence. Flying is something that requires precision, quality and knowledge. Just think how many centuries people have dreamed of ways to fly! And today, every modeler has basic knowledge of the aerodynamics, materials and construction that were secret even for Da Vinci. When you learn to project, create and manage a flying device, you can say that you are in a privileged circle of those who have mastered the "flying secret".

Do not worry if your first model will crash and break - surely it will. Sooner or later. Crashes are also happening to those modelers with 20 years of experience. Sometimes it happens without a "human factor" - radio disturbances (most commonly with cheap Chinese radios), battery downs, etc. The author of these lines has crashed and losed models at all possible ways.Only thing that I've never had is a "…

Beginners Guide Part 5 - Batteries And Chargers

LiPo (lithium polymer) batteriesPlease, read this topic carefully, LiPo batteries are highly flammable and can explode. They even burn in the water because they do not need oxygen for burning.

Nowadays, this type of battery suppressed NiCd (Nickel-Cadmium) and NiMH (nickel-metal hydride) batteries because they have lower weight and low voltage drop compared to Nickel type batteries. The NiCd is still used to power the RC components in the glider (receiver and servo) as well as in the radio transmitters, but it is very likely that your new electric model will be driven just with LiPo batteries.

While NiCd and NiMH batteries for RC models typically consist of 4 to 8 cells, LiPo comes in 1 and up to 12 cells, although batteries over 6 cells are rarely used for beginner models.
The nominal voltage of a LiPo cell is 3.7V.
When the single cell is full charged voltage is 4.2 Volts.
Battery labels tell us how many cells a battery has, and the letter S is used for this label.

So in the specifi…

Beginners Guide Part 4 - Electric Motors

Choosing the motor We have come to one of the most important parts of every RC model, which is a main engine drive.
About this topic it can be written very much , because, indeed, there is a lot of details about the main drive, I will try to keep as much on the most basics that can satisfy the absolute beginner without being overwhelmed with the amount of data and options choosing a motor.

We divide the engine drives into two categories: internal combustion engines and electric engines.

Nowadays, electric motors with their efficiency and price are mostly the first choice for beginners, so I'll base this topic onto them.

Electric motors
Electric motors are divided into several categories: The basic division is based on brushed and brushless motors. Brushed motors are of the older generation they wear and have the need to replace the brushes from time to time. Also they have less efficiency than brushless motors. By choosing the type of motor also depends choice of ESC (the brushed…

Beginners Guide Part 3 - Servos and controls

Servos and controls
Servo motors receive signals from the receiver and turn them into work. They are in RC models similar to what the muscles are in your body. The servo is most often used for controlling aerodynamic surfaces that then change the air flow on airplane wing or tail and thus the flight direction of the model itself. By aerodynamic surfaces, we mean the steering and directional control surfaces like ailerons, elevator, rudder, flaps, air brakes, etc.

For models with internal combustion engines, one of the servo should be assigned for throttle control. It is clear that some smaller and lighter servo can be used for this purpose since its strength is not the most important, but it is precision. The servo and the carburetor on the engine are adjusted so that the full throttle on the stick makes the engine reach its maximum speed, while with the stick at the opposite end, holds motor at idle.

Servos can also be used to control the wheels on the model in order to control the d…

Beginners Guide Part 2 - ESC and BEC

ESC ESC means Electronic Speed Controller.
Every electric RC vehicle has its power system which consists of motor, ESC and LiPo battery.
ESCs connects between the motor and the battery. They have more important functions.
First, the ESC gives impulses to the motor without which the motor could not operate. Second, it controls the motor speed, according to the throttle position. Thirdly, it powers the other RC devices in the model (receiver and servos) so that no special battery is needed. Fourth, monitors that the voltage in the LiPo battery does not fall below 3 volts per cell, which would cause problems with the power of other RC components and may even destroy the battery.
ESCs today are a small computers and allows programming of a large number of parameters, ranging from impulse length to minimum battery voltage.

They generally come in 2 versions, with built-in BEC (Battery Eliminating Circuit) for powering the receiver and without the BEC (OPTO ESC).
In addition, two values are…

Beginners Guide Part 1 - Radio

Enter into the Hobby!

Before we begin, you must decide how much you are interested in modeling. This hobby asks a lot of free time, but also money. I say this in order to immediately be able to skip the toys from  a variety of different Chinese stores.

Choosing the Radio (transmitter) Let us start from the transmitter as a crucial element.
As a minimum you need transmitter with 4 channels (throttle, aileron, elevator and rudder ).
Every RC modeler will recommend that you don't save money on transmitter. Once purchased, the transmitter will rarely be changed, so I recommend a minimum of a six channel transmitter with which you still have room for improvement. The transmitter will be used for all of your models.
All newer transmitters use 2.4 GHz spectrum (instead of 35/40/72 MHz) as well as Wi-Fi networks, and do not need be paired with crystal quartz to use a specific channel. Transmitters at 2.4 GHz themselves paired with receivers, are more resistant to interference and there c…