93668857 aeromodeling club bbsbec

8/12/2019 93668857 Aeromodeling Club BBSBeC

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Give Wings to Imagination

Coordinator :

Er.Harpreet Singh Aujula

Presented by :

Ratandeep PandeyHriman Singh Khera


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DETAILS AND CONSTRUCTION


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How Wings Lift the Plane

Airplane wings are curved on the top which makes air move fasterover the top wing.

The slower air underneath the wing pushes up from below.

The faster air pushes down from the top.

This forces the wing to lift up into the air.


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WING CONSTRUCTION

Several airfoils are cut from balsa wood

These airfoils are connected using aluminium rod and balsa

support rods

The structure is partially covered with 1mm sheet balsathroughout the wing span

Finally ailerons are attached to the wing.


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What is SERVO

A "servo" is a generic term used for an automatic controlsystem.

It comes from the Latin word "servus" - slave,that means a mechanism that you can set and forget.

RC servos are remote control devices servos typicallyemployed in radio-controlled models.


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How Does it works ?

RC servos are composed of an electric motor mechanicallylinked to a potentiometer.

A standard RC receiver sends pulse-width modulation(PWM) signals to the servo.

The electronics inside the servo translate the width of thepulse into a position.

When the servo is commanded to rotate, the motor ispowered until the potentiometer reaches the valuecorresponding to the commanded position.


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Functioning of SERVO

The servo is controlled by three wires:1. ground,2. power, and3. control.

The servo will move based on the pulses sent over thecontrol wire, which set the angle of the actuator arm.

The servo expects a pulse every 20 ms in order to gaincorrect information about the angle.

The width of the servo pulse dictates the range of theservo's angular motion.

S ll R/C h i


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Small R/C servo mechanism

1. electric motor2. position feedback potentiometer

3. reduction gear4. actuator arm


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SERVOS

These are responsible for controls of RC Plane.

The control parts ailerons, elevators, enginethrottle and rudders are connected to the servosusing push rods.

All servos are connected to receiver.

Rotation of servos (torque) on receiving signalfrom transmitter causes the movements ofcontrol parts.


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AILERON SPECIFICATIONS

Length of aileron Breadth of aileron

The edges of the aileron were rounded tominimize drag effect.


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MAKING TAIL

One point to be kept in mind while making theelevator and rudder is that their area too is to beincluded in the area of the tail and verticalstabilizer respectively.


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VERTICAL STABILIZER ANDRUDDER


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FUSELAGE

an aircraft reliability is a very importantissue.

Hence the strength of the plane is a very criticalissue and needed to be handled carefully.

In


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FUSELAGE

maintain the proper aerodynamic shape of thefuselage severalsc nnersare set in the hindsection of the fuselage.

Between the scanners trusses are made.

Similarly on the base we make trusses.

At some places 6 mm balsa wood is also used togive strength.

To


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FUSELAGE

Proper strength must be there because it mustnot break due to the vibrations of engine.

Also, the part where Landing Gear have to bemounted must be very strong, so that it can take

up the vibrations at the time of landing. These parts are made using double layers of 6

mm ply.


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ENGINE

Engine types- IC engines, turbofan, turbojet,

electric etc.

We use IC engine(OS 0.46 and OS 0.15) and

electric engines.

Engine mount is first fixed to the front of

fuselage using nuts and bolts.

Engine is attached to the mount.


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WHEELS

(Landing gears)


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FUEL TANK

use a mixture of methanol and castor oil.

Level of fuel tank must match the oil input valve.

We

The internal mechanics of a glow engine pulls fuel into thecarburetor and does not require a fuel pump

"T" coupler


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FINDING THE POSITION OF WING

One of the most important thing is to find asuitable position for the wing.

For if the centre of gravity of the entire system isnot in between the aerodynamic centre and the

tail then the plane will not be stable. We try to keep the position of centre of gravity at

a distance of 0.1c to 0.2c from the aerodynamiccentre.

The aerodynamic centre is located at a distanceof 0.25c (approximately) from the leading edge ofthe wing for subsonic speeds.


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FIXING WING

The wing is attached to the fuselage with thehelp of thin rubber tubes.

With this we can separate the two parts andchange the position of the wing as per the

requirements. Like we can use a engine of better capacity.

But with that the weight will increase and so theposition of centre of gravity will vary.

So, we will have to readjust the wings position.


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Dynamics of Flight

The ileronsraise and lower the wings. The rollof the plane is controls by raising one (right)

aileron and lowers the other (left) aileron, rollstheaircraft to the right.

Picture of lane in roll


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The ruddercontrols the y wof the plane.They moves left and right.Moving the rudderto the right, y wsthe aircraft to the

right.The rudderand the ailerons are used to turn the plane.

Picture of lane Yaw


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The elev torsare fixed on the tail section and are used tocontrol the pitchof the plane.

The elev torscan be raised and lowered.Lowering the elev tors makes the plane nose go down and

allows the plane to go down.

Picture of Plane Pitch


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Each type of above mentioned motion helps control the directionand level of the plane.


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COVERING


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93668857 aeromodeling club bbsbec

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