RC PLANE WITH

SLATS AND FLAPS

SCIENCE AND TECHNOLOGY COUNCIL

AEROMODELLING CLUB

IIT KANPUR

PROJECT BY –

ARPIT KHUNTETA

SANDEEP SINGH

POONAM RAUT

ANSHITA AGRAWAL

INSPIRATION :

WE WERE THINKING ABOUT INCREASING THE LIFT OF THE PLANE. BY

INCREASING THE ANGLE OF ATTACK LIFT CAN BE INCREASED. SO WE

THOUGHT THAT IF WE COULD MAKE MOVABLE SLATS THEN IT WILL SERVE

OUR PURPOSE. HENCE WE DECIDED TO MAKE MOVABLE SLATS AND

SEARCHED DIFFERENT MECHANISMS OF MOVABLE SLATS AND FINALLY

DESIGNED OUR OWN MECHANISM!.

WE ARE PLANNING IF WE CAN GET SOME STASICAL DATA USING SOME

SENSORS, DURING ITS FLIGHT, SO AS TO SEE HOW PRACTICALLY SLATES ARE

USEFUL.

DETAILS ABOUT THE PLANE

1. WING :

WE USED DESIGNFOIL SOFTWARE TO DECIDE THE AIRFOIL

SHAPE OF THE WING. AIRFOIL IS SHAPE OF THE CROSS SECTION

OF THE WING.

WE CHOSE NACA 3415 WHERE

# 3 IS MAX HEIGHT AS A PERCENTAGE OF CHORD.

# 40 IS MAX CAMBER LOCATION AS A PERCENTAGE OF CHORD.

AN AIRFOIL WHICH IS IS NOT SYMMETRIC IS CALLED CAMBER.

# 15 IS MAX AIRFOIL THICKNESS AS A PERCENTAGE OF CHORD.

CHORD LENGTH OF AIRFOIL : 25 cm

TOTAL WING SPAN : 150 cm

TOTAL AIRFOILS USED 14 WITH EQUAL SPACING.

WE USED 3 mm BALSA FOR AIRFOILS.

WE CONNECTED ALL AIRFOILS THROUGH CONNECTING RODS.

TWO CONNECTING RODS WERE THERE AT LEADING AND

TRAILING EDGES AND ‘T’ & ‘I’ SHAPED CONNECTING RODS

WITHIN THE AIRFOIL.

WE MADE THE WINGS IN TWO PARTS AND THEN JOINT THE

THEM BY LAYERS OF BALSA TO GIVE IT PROPER STRENGH. WE

USED 6 SHEETS OF 3 mm BALSA TO MAKE THESE JOINTS.

WE JOINT TWO ROUND STYROFORM AT EITHER ENDS OF THE

WING TO GIVE IT PROPER SHAPE AND USED TAPES TO GIVE IT

STRENGTH.

WE COVERED THE PLANE BY PLASTIC COVER.

2.SLATS :

# WE MADE SLATS BY USING STYROFORM AND USED TAPING TO

GIVE IT STENGTH. IT WAS A FREE HAND SHAPING BY SAND PAPER.

# THE SHAPE OF THE SLATS ACCORDING TO MEASUREMENTS OF

AIRFOIL.

SLAT MECHANISM:

WE USED A SMALL PIECE OF PLYWOOD AND HINGED IT TO THE LEADING

EDGE OF WING THROUGH CLIPS SO THAT IT CAN MOVE INDEPENDENT OF

OTHER PART OF WING.

WE ATTACHED THIS ROD TO A SERVO SO THAT IT CAN CONTROL ITS

MOVEMENT .

USES OF MOVABLE SLATS :

1. SLATS INCREASE THE EFFECTIVE CHORD LENGTH OF AND THUS

INCREASE THE LIFT COEFFICIENT. The lift coefficient is equal to

is the lift force,

is fluid density

is true airspeed( speed of the body relative to a static point on the

earth's surface)

is dynamic pressure, and

is planform area.

2. SLATS ALSO HELP IN DELAYING FLOW SEPERATION.

3. THE LEADING EDGE SLATS ALLOW THE STEEP CLIMB ANGLE UPTO

30 – DEGEES.

FLAPS:

# WE MADE FLAPS BY USING STYROFORM AND FREE HAND SHAPING WITH

SAND PAPER. WE USED TAPING TO GIVE IT PROPER STRENGH. WE MADE IT

CONTINUOUS FOR STABILITY.

# WE JOINED THE FALPS TO THE WING BY PLASTIC HINGES.

USES OF FLAPS:

1. FLAPS INCREASE THE SWEPT AREA AND HENCE THE LIFT

GENERATED IS INCREASED.

2. EXTENDED FLAPS INCREASE THE DRAG COEFFICIENT WHICH

HELPS IN DECREASING THE SPEED OF THE PLANE DURING

LANDING.

THE FUSELAGE OF THE PLANE:

WE USED CORO FOR FUSELAGE CONSTRUCTION AND STRENGTHENED IT BY

DOUBLING THE LAYERS AT THE BASE.THE SPECIFICATIONS ARE AS FOLLOWS-

Width-10cm

Max. Height-10cm

THE SHAPE OF THE FUSELAGE WAS MADE SUCH THAT IT CAN SUPPORT

WEIGHT OF THE WING PROPERLY .

SO WE GAVE ANGLES TO LATER PORTION OF FUSELAGE . THE FUSELAGE WAS

DIVIDED INTO THREE PARTS .THE LATER PART WAS STRENGHTHENED BY FILLING

IT WITH STYROFORM.

FOR THE FORMER PART WE USED PLY WOOD TO FIX THE MOTOR AND

ATTATCHED IT BY USING MOLTEN PLASTIC.

WE ALSO USED PLY IN INNER PARTS OF FUSELAGE.

AND TO PROVIDE PROPER SUPPORT TO THE HORIZONTAL AND VERTICAL

STABILIZER WE SUPPORTED CORO BY BALSA WOOD.

THE LANDING GEAR WAS PLACED IN SAME LINE AS OF WING NEAR THE CENRE

OF GRAVITY OF THE PLANE.

WE PROVIDED REQUIRED STRENGH AT THE LANDING GEAR POSITION BY

USING PLY ON BOTH INSIDE AND OUTSIDE OF THE FUSELAGE WHICH

HELPED IN DISTRIBUTION

OF LOAD UNIFORMLY.

HORIZONTAL AND VERTICAL STABILIZERS :

WE USED 6mm BALSA WOOD FOR VERTICAL AND HORIZONTAL STABILIZER .

STABILIZERS WERE SHAPED WITH INNER PART BROADER AND OUTER PART

NARROWER.

THE STABILIZERS WERE MADE HOLLOW TO REDUCE WEIGHT AS MUCH AS

POSSIBLE.

WE FIXED THEM INTO THE SLOTS MADE IN REAR PART OF FUSELAGE .

TO PREVENT AIR FLOW THROUGH THE STABILIZERS , WE COVERED THEM

WITH PLASTIC SHEETS AND TIGHTENED IT USING AIR BLOWER.

ELEVATOR:

ELEVATORS WERE MADE IN RHOMBUS SHAPE AND WAS MOVED BY

ATTATCHING IT VIA PLASTIC HINGES TO THE HORIZONTAL STABILIZER.THEY WERE

MOVED TO PROVIDE PROPER DIRECTION TO PLANE .

RUDDER:

RUDDER WAS ALSO MADE IN RHOMBUS SHAPE BUT WAS CONNECTED TO

VERTICAL STABILIZER.IT WORKED IN SAME WAY AS ELEVATOR.RUDDER USED TO

MOVE LEFT AND RIGHT MOTION.

SERVOS:

WE USED 6 SERVOS IN THIS PLANE. TWO SERVOS EACH FOR RUDDER

AND ELEVATOR, TWO FOR SLATS ,AND TWO FOR FLAPS. WE USED HINGES

AND RODS TO CONNECT IT TO THE RESPECTIVE PARTS AND CONTROL THE

MOVEMENTS.

WE USED ‘Y’ CONNECTOR FOR THE MOVEMENT OF FLAPS SO THAT

IT CAN ACT BOTH AS FLAPS AND ALLERONS.

WE USED MOLTEN PLASTIC TO CONNECT SERVOS TO PLANE.

ELECTRONICS IN THE PLANE:

2600mah lipo battery

9gm servo

NTM electric motor 1100kv

30amp ESC

11X6 propeller

connectors

PROBLEMS FACED:

1. DECIDING SLAT MECHANISM :

FIRSTLY WE THOUGHT OF A DIFFERENT MECHANISM BUT IT DIDN’T

WORKED OUT PROPERLY . SO WE SWITCHED TO ANOTHER

MECHANISM.

2. MINIMIZING WEIGHT:

WE FACED THE MAJOR PROBLEM IN MINIMIZING THE WEIGHT OF

PLANE. SO WE AVOIDED MAKING MOST OF THE PARTS SOLID

3. STRENGTHNING OF FUSELAGE:

IT TOOK A LOT OF TIME IN DECIDING WHERE TO GIVE MORE

STRENGH.

4. IN ASSEMBLY OF HORIZONTAL AND VERTICAL STABILIZER:

HINGES WERE NOT SUFFICIENTLY STRONG SO WE USED TO REPLACE

IT REPEATEDLY.

SOURCES OF INFORMATION:

*GOOGLE

*RC GROUP FORUM

*OUR COORDINATORS