RC aircrafts

Here we are with the rc planes.one of the most important emerging technologies nowadays.the purpose is to make the user,most probably a beginner,familiar with the parameters to fabricate an efficient rc aircraft.
forces acting on an aircraft are depicted as under.

weight accounts for the weight of the engine,the payloads and fuel.as the weight changes as fuel is consumed so centre of mass of aircraft also changes so we have to adjust it as per our demands.

second comes lift which is compensating the weight.and it depends on the velocity,size and shape of the aircraft.thrust is provided by the engines to overcome the drag force.

The basic principle on which all aircrafts are working at is Lift/Drag ratio.as is patent from formula the lower the drag the higher will be the lift and consequently ull be able to achieve higher altitudes.but this doesnt work for aircrafts travelling at lower speed because less drag will add to less stability and hence will result in landing problems.on the other hand if we increase the drag the aircraft will become stable but with a side effect of reduce in maximum attainable altitude and also to some extent cause takeoff problems.
the parts of an aircraft are defined here:

FUSE LAGE

the function of fuse lage is to hold the structure together.

WINGS

Wings generate lift and control the airflow while flying. Wing design is a crucial factor in aviation: a wing is designed to reduce drag at the leading edge, generate lift by its crescent and manage airflow using the rear edge.

SLAT

Slats adjust the angle of attack of the wings, increasing lift. Slats are fitted at the leading edges of the wings, and deploying them increases the angle of attack of the wings, allowing the pilot to increase the lift generated by the wings

FLAP

Flaps adjust the camber of the wings, increasing lift. Flaps are normally fitted at the trailing edge of the wings. Extending the flaps increase the camber of the wings airfoil, thus increasing lift at lower speeds, an important feature for landing

AILERON

Ailerons increase or decrease lift asymmetrically, in order to change roll and, thus, move the aircraft left or right while flying. Ailerons are hinged sections fitted at the rear of each wing. Ailerons work asymmetrically as a pair: as the right aileron goes up, the left one comes down and viceversa, thus making the aircraft roll right or left, respectively

HORIZONTAL STABILIZER

The horizontal stabiliser helps maintain an airplane's equilibrium and stability in flight. It does so by providing a mini wing at a certain distance from the main wings (typically at the back, although it can also be positioned at the from of the aircraft). This smaller wing produces enough lift to control the pitch of the aircraft and maintain its stability. Although an aircraft without a horizontal stabiliser could, in principle, fly with wings only, controlling its pitch and airspeed would be difficult, as pitch and, subsequently, airspeed can be easily disturbed by air conditions: as soon as the aircraft pitches up, the tendency is to continue pitching up even further and decrease airspeed; and as soon as the aircraft pitches down, the tendency then is to continue pitching down even further and increase airspeed. An aircraft with a horizontal stabiliser, however, could be flown hand-offs (once correctly trimmed) without affecting its pitch and speed

ELEVATORS

Elevators increase or decrease lift on the horizontal stabiliser symmetrically in order to control the pitch motion of an airplane. Elevators are hinged surfaces fitted at the rear of the horizontal stabiliser. They work symmetrically as a pair: when the elevators are up, the aircraft ascends; when the elevators are down, the aircraft descends, and when the elevators are horizontal, the aircraft flies straight 

VERTICAL STABILIZER

The vertical stabiliser prevents lateral movements of the airplane. Without a vertical stabiliser, most aircraft would lose lateral control, tend to slip, increase drag and become uncontrollable

RUDDER

The rudder controls the yaw motion of an airplane. The rudder is a hinged surface fitted to the vertical stabiliser. When the rudder is turned to the left, the aircraft turns to the left in the horizontal plane; when the rudder is turned to the right, the aircraft turns to the right. The rudder is used to turn the aircraft left or right on the ground. In the air, however, the rudder is primarily used to coordinate left and right turns (the turns themselves are done with the ailerons) or to counter adverse yaw (e.g. when crosswinds pushes the airplane sideways).

AIRFOILS

there are many types of airfoilsbut in my opinion if u r looking for an airfoil dat can provide the best lift then you should opt for  M06-13-128 .according to my survey this airfoil provide maximum lift when applied at an angle of attack 12-15 and Re number 2*10^5.another better option is  FX63-137.this airfoil provide maximum lift at angle of attack 15 and Re number 2*10^5.Anyhow the type of airfoil you are using depends on your requirements.

PROPELLOR

propellor is used to provide forward thrust to the aircraft to overcome the drag force.

hope that the above information will to some extent give you the basic knowledge about designing an aircraft.

source:http://www.grc.nasa.gov/WWW/k-12/airplane/forces.html

wikipedia.org