The document discusses several key factors in landing gear design: 1. Landing gear must provide adequate ground clearance for the propeller tips and allow the plane to rotate on takeoff and landing to achieve the stalling angle of the airfoil. 2. Factors that affect landing and takeoff speeds and angles include the airfoil characteristics, planform, effect of flaps, and ground effect. 3. NASA's droop wing design increases takeoff and landing angles by delaying wing tip stalling and providing effective aileron control in a stall.

1. LANDING GEAR DESIGN
-to provide adequate clearance b/w prop.Tips n ground
-to permit the plane to rotate on both taking off n landing so that
wings AoA come close to the stalling angle of airfoil
-the airfoil characteristics n Rn at landing n takeoff speed
-adjustment of section values to those for wing’s AR n plan form
-the effect on the stalling angle of flaps when extended.
-the impact of ground effect
- Nasa droop increases landing/takeoff angles

2. Landing gear
Fore –plane characteristics
To estimate the landing/takeoff speed n angle
-Section value adjustments
-High lift devices –takeoffs r
optional ;landings r unavoidable
-Ground effect-
-reduction in stall AoA n in induced
drag

3. NASA safe wing droop
delays tip stalling n
provides effective aileron
in stall
-Occupies 38% of semi
span
-Provides 4 degree more in
takeoff/landing
- longer landing gear
increases tail angle that
brings AoA attack above
the stall for
takeoffs/landings
- reduce the tail angle to
avoid the stall
-Longer landing gear
increases weight n drag

5. Power loading
-cid- cubic inch of engine displacement
CG & Landing gear
-CG shifts :combustion of fuel
-types of LG-
-tricycle-front wheel steerable
-tail dragger-tail wheel steerable

6. Landing gear dynamic
Tricycle gear-
-prevents nosing over
-tail skid rests on the ground n
CG shifts aft wheel axel then it
will stay tail download
-to prevent this LG shifted 5%
of MAC aft CG
-a very high thrust line n
fuselage upsweep is needed to
avoid long LG n prop.
protection -crane
-high tail moves wheel axel
farther behind the CG requires
heavy up –elevator deflection
for takeoff
Tail dragger –
-disadvantages-nose over , liftoff
prob.

7. Detail design
 To locate LG
 Tricycle gear
 Tail dragger
Tread width
-wheel tread is 25% of AR 6 span
-Static load squat
-Wheel diameter for paved runways 2
inch,grass-2.25 or 3

8. Nose n tail wheel design
-
Main LG legs
-should be continuous
piece of metal from
wheel to wheel so that
bending loads do not hv
to b absorbed by
fuselage