Sunday, November 13, 2011

Remote Controlled Airplanes


A remote controlled airplanes or RC Plane is controlled remotely by a hand-made transmitter and a receiver within the aircraft. The main use of the receiver is to adjust controls of the corresponding servos (a small device that has a three phase DC motor, a gear, an IC or Integrated Circuit, a potentiometer and a shaft bearing) that run the control surfaces depend on the position of joysticks of the transmitter. Flying remote control aircraft has become a hobby of the worldwide people. There is a wide variety of models and styles are available for RC planes. Experiments and researches are made nowadays for using more efficient motors, low cost maintenance more fuel efficient internal combustion or jet engines, lighter and more effective batteries and more powerful radio systems. The most important thing is that scientific, military, government and non government organizations are trying to use remote control airplanes for experiments, defense system, weather forecasting and even use these RC planes as spy planes or drones. 

The history of model aircraft includes with hydrogen-filled model airships at the late 19th century. In 1920 the establishment of  Royal Aircraft from Britain was a new era for the remote controlled airplanes. This Royal Aircraft was the first company to built and tested the Larynx (a special type of monoplane with a flying range of 100 miles) and was made by Lynx engine. This model was modified at the 1930.

There are various types of radio controlled air crafts ( remote controlled air crafts). For the newbies there are park pilots and trainers airplanes. For more experienced pilots glow plug engine, electric powered and sailplane air crafts are the most suitable. For expert pilots jets, pylon racers, helicopters, auto gyros, 3D airplanes are most preferable. Some models are made by replicating historic and little known types and trying to give size of a full-size aircraft as flying scale models. These models later convert with control line and free flight types of RC planes. The most popular types of RC planes are internal combustion engines, jet and electric motors.

As we all know that most planes (except gliders) need a power plant to operate them. For small 2 and 4 stroke engines there are three types of internal combustion engines. Nitro methanol is used as fuel for the Glow plug engines. As ignition agent diesel is used for compressive ignition. This method is also suitable for larger engines, but for this gasoline must be used as fuel.

Due to low cost and less weight component nowadays electric powered models are mostly used. For better servicing Lithium ion polymer batteries and brushed motors and brush less motors are used. The main reasons for choosing electric motors are their low cost, no need of fuel and easy starting. Nowadays lithium Polymer (Lipo) batteries are also used because of their cost prohibitiveness. But before use these batteries one firstly need to know about their correct method of charging, otherwise there is a risk of explosion. All the batteries of same pack need to charge simultaneously with the same charge.


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