INSTALLATION OF RETRACTABLE LANDING GEARS IN THEORPEDO T211 AIRCRAFT

THORPEDO T211 AIRCRAFT

OBJECTIVE• To replace the fixed Tri-pod landing gear system

with a retractable Tri–pod landing gear system in the aircraft.

• By replacing the landing gear system the drag in the aircraft can be reduced thereby enhancing its performance.

• In order to change the landing gear, the design of the wing has to be altered, thus supporting the retractable landing gear system.

SPECIFICATIONS

Wingspan 26 ft. 8m Length 19' 3” 5.8m Height 6.3 ft. 1.9m Wing area 115 ft2. 10.68m2 Landing gear oleo strutsUseful Load 605 lbs. 274 kg Cockpit width 40" 102cm Gross weight 1,270 lbs. 556 kg Empty weight 665 lbs 302 Kg Wing loading 11.lb/sf 52 kg/m2 Fuel capacity 21 gal 79.5 ltr Baggage 40 Lbs. 18.1 kg Engine Jabiru 3300 -120 H

PERFORMANCE

• Stall speed (flaps) 47 mph 41kts

• Stall speed (clean) 52 mph 45 kts • Top Level Speed 132 mph 115 kts • Takeoff roll 350 ft. 107 m • Landing roll 400 ft. 122 m • Climb Rate 1,020 fpm 310 mpm • Service Ceiling 15,300 ft. 4,724 m • Maximum Range 375 mi. 326 n.m.

RETRACTABLE LANDING GEAR

• To decrease drag in flight some undercarriages retract into the wings and/or fuselage with wheels flush against the surface or concealed behind doors; this is called retractable gear.

HOW DOES IT WORK???

Landing Gear Mechanism

RETRACTABLE LANDING GEAR

ADVANTAGES OF RETRACTABLE LANDING GEAR

• Drag Reduction.

• Less SFC.

• Enhanced Range and Endurance.

Let,Wing Span , b = 7.62mWing Area, S = 9.75m2

S = b x Croot

Solving,

Croot = 1.28m

Aspect Ratio, A.R =

= 5.953m

Wing loading, =

= 576.607N/m2

Stall Velocity, Vstall =39 knots

=20.063m/s

CLmax =

Density at sea level= 1.225kg/m3

Hence, CLmax = 2.338746

Reynolds's number, Re =

0= 1.667x10-5 Ns/m2

0 = 1.225kg/m3

Re = 3.8318023 x 106

Hence its transient flow.

For the required CLmax and Reynold’s number following airfoil is selected

NACA 4415

NACA 4415

Next steps:

Preparation of model (15/2/2010)

Testing of model in the wind tunnel

(with landing gear)(16/2/2010)

Next steps: Testing of model in the wind tunnel

(without landing gear)

Study and Installation of Retractable Landing Gear

Proposal of the Design changes to the Organisation

THANK YOU!!!!

NACA 1410