Servos - The Beginners' RC Planes Guide

Servos are the end units in a radio control chain. They are used to move the aircraft's control surfaces, the motor throttle and to actuate other devices such as retractable landing gears. A servo consists basically in a motor, gearbox, feedback potentiometer and an electronic board inside a plastic case. Outside are the servo arm and the servo cable and plug.

The servo arm is often a plastic piece with holes on it for attaching push rods or other mechanical linkages.

There are linear and rotary servos, but the most widespread today are the rotary servos whose arm rotates about 45 degrees left and right from its centre point.

The picture on right shows some servo hardware, such as mounting screws, rubber pads, and different sorts of servo arms.

How to build and fly an RC plane

Some very useful information here

DIY Beginner RC Plane

Great tutorial.

Batteries - The Beginners' RC Planes Guide

Batteries are available in different sizes, weights, voltages and capacities C, which refer to their stored energy expressed either in amps-hour Ah or milliamps-hour mAh. For example, a battery with a capacity of 500mAh should deliver 500mA during one hour before it gets totaly discharged (flat).

Radio control sytems are usually powered by rechargeable batteries. Rechargeable battery types available on the market today are: Nickel-Cadmium (NiCads) Nickel-Metal hydride (NiMH) and Lithium-Polymer (Lipo) batteries. Even Lead-Acid batteries are also used as ground power source.

Normally the NiCads stand more "abuse" which means that they may be charged at higher rate (normally 2 - 4C) and have the ability to deliver higher current, i.e. discharge rates up to 2C continuous or 8 to 10C during 4 - 5 minutes and even up to 100C during very short time. They have some designations such as the Sanyo AE for high capacity and AR or SCR for quick charge/discharge.

A NiCad cell consists basically in a positive plate foil of nickel metal with nickel oxide/hydroxide, a negative plate foil of cadmium metal with cadmium hydroxide and an isolating porous separator film moistened with an electrolyte of potassium hydroxide (caustic potash). The two plates are sandwiched between the isolating porous separator films, rolled up and enclosed in a nickel-plated steel can. A spring-loaded vent is fitted at the positive terminal end in order to release the electrolyte and/or gasses, in case overpressure occurs due to overcharge. See picture below.

How to Choose The Right Remote Control Airplane

If you are looking for a new hobby that is more exhilarating than fishing, remote control aircraft flying is a hobby that you should look into. Flying a radio controlled plane at high altitude and doing aerobatics is fun and exciting. But first you have to get into the business of finding the right remote control airplanes that will suit you as a beginner. It seems easy and fun but like all activities flying a RC plane takes time and patience to perfect. But there are things you must know before finding the right remote control airplanes for you. RC planes for beginners are susceptible to wind and turbulence. Because of the small sizes, these are suited for small area practice flying. And also makes them vulnerable to winds that are faster than 5 miles per hour. Your orientation of directions, up and down, left or right will be tested in flying.

Glow Engines - The Beginners' RC Planes Guide

There are two main propulsion systems used by R/C models today: The internal combustion systems (glow engines) and the electric motors. Combustion engines' energy source has so far a higher energy/weight ratio than the batteries used to power the electrics. However, the combustion engines are usually more noisy and more prone to oil spillage than the electric motors.

There are two types of glow engines: The four-stroke and the two-stroke.

Two-stroke engines are the most used, mainly because they are simple made, light, easy to operate, easy to maintain, and are usually inexpensive. Two-stroke engines operate at a high RPM and therefore can be quite noisy without a good silencer.

Electric Motors - The Beginners' RC Planes Guide

Electric powered model aircraft has gained popularity, mainly because the electric motors are more quiet, clean and often easier to start and operate than the combustion motors.

They need batteries to operate and despite some developments in this area; the batteries still are somewhat heavier as energy source compared with the gas fuel.

Thus, the electric flier has to strive to build the model as light as possible in order to obtain a reasonable wing loading and/or a reasonable flight time.

The electric motor's operation is based on the electromagnetic principle. When electric current flows through a coil it creates a magnetic field with a strength proportional to the current's value, the number of windings of the coil and is inversely proportional to the coil's length. The strength of the magnetic field will further increase by introducing a so-called ferromagnetic material inside the coil.