RC Helicopters

8 Apr

In the past I have discussed Project Ideas related to RC Planes and Cars, Yesterday I received a mail asking me about information related to RC Helicopters.These helicopters also known as Radio Controlled Helicopters.They are toys which can be controlled using remote control.Building them help us to understand the concepts of real helicopters and their flying.This project is for Mechanical , Aeronautical and Physics students.

These helicopters can be used for :

Spying Purposes (With Camera)
Fire Fighting ( Give us details of exact location of fire)
Traffic Details ( Fly up and record traffic information)
To spray pesticides in the field.(Chinese people using it) 

RC Helicopters are by-far the most amazing adult hobby out there. Nothing is more thrilling than to see a scaled down version of the real thing flying around, flipping about, and doing other amazing 3D feats that a real helicopter could never do; and, better yet, you are the pilot! But way before anyone should take their first flight, they should understand how a helicopter works, and more importantly, how all the small parts come together to form a beautiful flying system. Before watching the incredible videos at the bottom of this page, let me give you some background information about remote control helicopters and how they work. By clicking on the links below, you can see how each part of the helicopter operates and how all the pieces come together to form an amazing flying system.

Transmitter

This is your standard 7 channel transmitter. It controls your remote control model by communicating with the receiver, which in turn sends signals to your servos instructing them how to move. Each stick movement or toggle movement corresponds with the motion of one of the servos on your model. Since this is a 7 channel transmitter, you can control up to 7 servos at a time. The transmitter displayed above uses 2.4ghz technology, the newest technology to hit the RC world. With this one transmitter, you can control up to 20 models! This ability saves the RC enthusiast alot of money because instead of buying a new transmitter for each model, he simply changes which model he is using on the display screen provided. Receiver

As I said on the transmitter webpage, the receiver is the middle man when it comes to conversations between your transmitter and servos. Any input you give to your transmitter, your receiver tells your servos to perform the desired output. Above is a picture of the AR7000 aircraft/helicopter receiver. It can be used in any type of model. Gyro

The job of the gyro is to maintain the position of the tail in flight. It controls a tail servo which controls the amount of pitch in the tail blades (negative or positive pitch, depending on the adjustment needed). If the wind is pushing the tail in one direction or the main blades are causing the tail to move, the gyro picks up on the change in position of the tail and adjusts accordingly. Simply put, the gyro makes sure that the tail doesn’t move regardless of what is happening around it. The only movement of the tail should be caused by the user’s input on his/her transmitter. Servos

Servos receive instructions from your transmitter and any input you give it. By pushing up on the right stick of your transmitter the servo may move one way, and by pushing down on the right stick the servo will move the opposite direction. Servos are rated on their reaction time and the amount of force they output. Metal gear servos are much better than plastic because the teeth on the gears on metal gear servos do not break as easily as the plastic ones. Without servos, flight would be uncontrollable. Electronic Speed Controller

The battery plugs directly into the electronic speed controller, which is controlled by your transmitter via the receiver. Whenever you throttle up, the ESC allows more and more electricity to reach your motor, which increases the speed of the blades. Keep in mind though, the speed of your blades is only part of the reason why your helicopter flies. Your servos control the pitch of the blades and determines how much air will pass above or below your blades, in turn, giving it lift in the positive or negative direction. Lithium Polymer Batteries

Helicopter flight would not be possible without some source of energy. Electricity is my choice. The batteries that I use, which have become an industry standard, are made of a gel-like substance called lithium polymer. These types of batteries hold a charge very well and have the ability to discharge at a high rate through 90% of their discharge. Not only that, they are extremely light for the amount of energy they hold. Flight times depend on the capacity of the battery and can last anywhere from 6-10 minutes. Brush-less Motor

The motor is what drives your blades. It is rated based on its energy consumption and the amount of rpms it outputs. The left stick on your transmitter, the throttle stick, controls the speed. Up is faster, down is slower. 3D flight, upside down flight, complicates matters. In 3D flight mode, the blades are at contant full throttle. The only changes are in pitch. Up is upward thrust, and down is downward thrust. So when the helicopter is upside down, and you push down on the throttle stick, the helicopter will actually rise upside down!
Anatomy of a miniature helicopter




Miniaturization

Techniques involve reduction of weight and complexity compared to normal sized RC helicopters:
  • Use of densest power sources available, such as lithium polymer.
  • Battery capacity only enough for a short flight, typically a few minutes.
  • Miniature DC motors.
  • Electronics made of SMD components and ASIC chips.
  • Light plastics or carbon fiber fixtures and structure.
  • Infrared control instead of radio.
  • Auto-stabilization with Stabilizer bar
  • No servos; directional control only via variable power to the tail rotor.


Helpful videos:
www.youtube.com/watch?v=GkLSdT3BZZghttp://www.google.co.in/url?sa=t&rct=j&q=how+to+build+of+RC+Helicopters&source=video&cd=2&ved=0CFQQtwIwAQ&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DxLFISUiXdeo&ei=vK5yT5TiKYLqrAeXuMW9DQ&usg=AFQjCNEPjRqNqoNm-mhUgL6Ue71djcDMhg

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One Response to “RC Helicopters”

  1. ttadas013 June 14, 2012 at 9:09 pm #

    The fantastic verified design as the used version and causes the amount and power of a brushless web page and longevity Li-Po energy offer.CLICK here RC Toys Now with enough energy to launch top to platform and execute even more techniques at a much faster amount.

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