Construction Of RC Helicopter:
1) Materials
Construction is typically of plastic, glass-reinforced plastic, aluminium or carbon fiber. Rotor blades are typically made of wood, fiberglass or carbon fiber. Models are typically purchased in kit form from one of about a dozen popular manufacturers and take 5 to 20 hours to completely assemble.
2) Resemblances
These model helicopters contain many moving parts analogous to those on full-size helicopters, from the swashplate to rotor and everything in between.
3) Precision
The construction of helicopters has to be more precise than for fixed-wing model aircraft, because helicopters are susceptible to even the smallest of vibrations, which can cause problems when the helicopter is in flight.
Additionally, the small size and low weight of R/C helicopters and their components means that control inputs, especially cyclic (pitch and roll) can have a very fast response, and cause a rotation rate much faster than the equivalent input might produce on a full-size aircraft. In some cases, this quick response can make the model unnecessarily difficult to fly. For this reason, most model helicopters do not use the (simpler) Bell rotor head design, but instead use the Hiller design with a flybar, or Bell-Hiller mixing, the former providing a much greater degree of stability, and the latter mixing the quick response of the Bell system with the stability of the Hiller design. Some models use the simple Bell design, but this is limited mainly to scale models that are more challenging to fly, or models using advanced electronic stabilizing equipment.
To reduce mechanical complexity and increase precision of the control of the swashplate some model helicopters use Cyclic/collective pitch mixing.
4) PARTS
Basically an rc helicopter consists of the following parts
i)Blades

ii)Bar Set

iii)Swash Plate

&
iv)Power Motor

How Do RC planes work?

The principle responsible for guiding the RC planes is the same that enables 747 jets to remain aloft and paper airplanes to glide. The principle of different RC planes can vary as per their designs. To make these RC planes function just as their full-size counterparts, different power sources can be used.
When an RC plane is mid-air, the transmitter passes the signals from the plane’s operator to the plane’s receiver. Just as the radio receiver converts signals into sounds, the plane’s receiver converts the signals into commands that run its mechanical components, including the rudder, propeller, landing gear and ailerons.
A circuit board is responsible for handling this process and helps to trigger the motion of the plane.
The drag and thrust effects are responsible for maintaining the forwards motion of an RC plane. The jet engine or the propeller provides the thrust. Until the time the thrust remains greater than the drag, the velocity of the plane remains constant. As long as the lift and thrust are greater than the drag and weight, the plane stays in the air.

There are two important types of engines used in remote controlled gliders such as helicopters. These engines are essentially a combination of methanol and nitromethane, which serve as the source of fuel for their combustion.
Heavier models of RC planes usually tend to use a form of internal combustion engine to power their flight. Most commonly used engine is the glow engine, which is a device that burns a combination of nitromethane, methanol and synthetic oil. Until the combustion process starts, an electric reaction heats the glow plugs present inside the engines. Thereafter, a two-stroke cycle rotates a crankshaft to power the airplane.
Flying RC planes can be a very interesting and satisfying hobby; however, it’s recommended that you seek the help of flight stimulators to understand the finer nuances associated with flying RC planes.

Regards

Khalid Mehmood.