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<strong>ROGALLO</strong> <strong>WING</strong> <strong>RC</strong> <strong>PLANE</strong><br />
“AEROMODELLING CLUB”
PROJECT MEMBERS<br />
• Tushar Sikroria (Aerospace Engg.)<br />
• Nikhil Sunil Upadhyaye (Civil Engg.)<br />
• Amit Kumar Gond (Aerospace Engg.)<br />
• Mayank Kumar Sharma (Civil Engg.)
INTRODUCTION<br />
Rogallo-wing is a delta-shaped wing which gives<br />
large lift to the fuselage. The plane requires a<br />
very short runway. This wing is made of any<br />
suitable fabric like parachute cloth, miler sheet<br />
or even plastic. In this project parachute cloth<br />
has been used. The cloth is supported by four<br />
rods and the sag given to the cloth gives lift.
<strong>WING</strong> STRUCTURE<br />
• Negligible porosity parachute cloth has been<br />
used for this project.<br />
• For the four support rods, balsa wood was<br />
used.<br />
• Each rod was made by joining three layers of<br />
balsa wood using bond-tite.<br />
• Three rods were 34” in length and one rod<br />
was 37” in length. Thickness was 1 cm.<br />
• Initially 70 X 40 “ cloth was cut out.
CHALLENGES<br />
• The material used for the rods should be light but<br />
strong so that the cloth is well supported.<br />
• Aluminium rods or plastic pipes can be used but<br />
they get bent easily.<br />
• Balsa wood is suitable. Balsa ply-wood is even<br />
better as one layer is sufficient.<br />
• The drawback of rods used is that these provide<br />
slight drag due to flat corners.<br />
• The round rods reduce drag. Even wood can do so<br />
if the edges are made smooth and slightly curved<br />
by sand – paper.
<strong>WING</strong> CONSTRUCTION<br />
• The cloth was spread on the floor.<br />
• One rod was fixed at the centre of the cloth,<br />
parallel to the breadth using bond-tite.<br />
• Two rods were fixed on either side of the middle<br />
rod at an angle of 60 degrees.<br />
• So we get a common point and three other points<br />
of rods.<br />
• The cloth was cut from the end point of the<br />
middle rod to those of the other to rods. Extra<br />
cloth was also cut along the side of the rods<br />
giving a delta shape.
• Each of the two rods was bent inwards by 2-3<br />
degrees to provide sag.<br />
• Care should be taken that both rods are bent by<br />
exactly same angle.<br />
• The tri-point of the three rods was held in<br />
position by fixing a triangular piece of balsa<br />
plywood.<br />
• The fourth rod was fixed perpendicular to the<br />
middle rod at a position such that the two ends<br />
reach the side rods. This was about 13.5” from<br />
the tri-point.<br />
• This rod was stuck at the two ends and at the<br />
middle. Thus, the rogallo wing is ready.
DIFFICULTIES<br />
• While fixing the rods initially to the cloth with<br />
bond-tite, the cloth along with the rods got stuck<br />
so firmly to the floor that it was almost<br />
impossible to remove from the floor.<br />
• The cloth should first be placed on a thermacol<br />
sheet covered by 5-6 sheets of paper. The sticking<br />
of paper will not create problem.<br />
• Sag(for providing lift) should be given carefully<br />
and equally on both sides for ensuring<br />
equilibrium during flight.
PYLON<br />
• Pylon(connecting medium between wing and fuselage)<br />
was made by using two layers of balsa ply-wood, each<br />
about 15 X 4 inches.<br />
• At the top, the pylon is cut to give an inclination of<br />
about 20 degrees(for providing the angle of attack to<br />
the wing).<br />
• A groove is made at the inclined edge (perp. to it)<br />
according to the width and thickness of the fourth rod.<br />
• Wing is fixed such that the fourth rod is fixed in the<br />
groove and supported by triangular plywood.<br />
• The base of pylon is fixed to a rectangular sheet of<br />
balsa ply-wood of suitable size.<br />
• Wing is ready to be attached to fuselage.
FUSELAGE<br />
• We have used a small fuselage for our wing.<br />
• The fuselage has no special requirement. Just<br />
the usual rudders and elevators are needed<br />
along with horizontal and vertical stabilizers.<br />
• We have repaired an old small broken fuselage<br />
for our project, about 35” in length.<br />
• The fuselage was open at its front end for<br />
adjusting servos and fuel tank.
ENGINE<br />
• 0.15 cu.in. engine is used(small for available mounts).<br />
• For attaching with mount, one arm was fixed with usual<br />
screws and bolts while the other side was fixed using<br />
strong wires from MME lab.<br />
• A wooden frame suitable for the mount was made from<br />
ply-wood.<br />
• Holes were drilled at the required places and the frame<br />
was fixed at the front of the fuselage.<br />
• The mount along with the engine was fixed using nuts and<br />
bolts and the propeller was attached.<br />
• Fuel tank was fixed near the mount using fibre tape.
<strong>RC</strong> PARTS<br />
• Three servos were attached using fibre tape.<br />
• Rudder servo was fixed near the vertical<br />
stabilizer, elevator servo at the end of the open<br />
part of the fuselage and the engine servo near<br />
the mount, at the side of fuselage.<br />
• Engine servo was fixed firmly using ductape.<br />
• The receiver and the battery were fixed at the<br />
backward part of fuselage.<br />
• One wheel was attached to the engine using bolts<br />
and a pair of wheels was fixed under the rudder<br />
servo using bond-tite.
FIXING<br />
• The servos were connected using thin aluminium<br />
pushrods of a length such that the rods do not<br />
bend while the servos rotate.<br />
• Rudder servo was connected both with the<br />
rudder and the wheel.<br />
• A wire was attached to the receiver and the other<br />
end was let free(antennae).<br />
• The wing was attached above the fuel tank using<br />
thick rubber string and balancing was checked. In<br />
our case a faulty servo was needed in front.
FUEL<br />
• The fuel used is methanol and castor oil in 3:1.<br />
• The two were mixed in this ratio in a bottle and the<br />
fuel was supplied to the fuel tank through the two thin<br />
rods using rubber pipes.<br />
• This process was done usin fuel supply pump.<br />
• One opening(thin rod) was connected to the engine<br />
using rubber pipe and the other was connected to<br />
another rubber pipe and let free as there was no<br />
silencer.<br />
• With silencer, this opening is connected to it for release<br />
of waste material.<br />
• The plane is ready for flight.
SCOPE FOR IMPROVEMENT<br />
• A longer fuselage and a greater power engine<br />
is better so that all the servos can be fit inside<br />
the fuselage.<br />
• A better mechanism for attaching the wing<br />
can be used.<br />
• Another servo can be used for the side wards<br />
deflection of wing for sharp turns.