323 exam type shii 3

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what are two froces parallel to the flight path in cruise?

drag and thrust

name five forces that the tail down force has to equal during normal cruise

• normal lift weight coupling

• thrust

• drag

• wing forward pitching moment

• fuselage destabilizing moment

what happens to performance as weight goes up?

decrease

what happens to performance as altitude goes up?

decreases

what is the difference between rated horsepower in the engine and the force that makes the aircraft go forward?

prop efficiency

what is dynamic hydroplpaning?

high speeds in standing water

what is viscous hydroplaning?

thin layer of water on top of a slippery surface

what is revrted rubber hydroplaning?

break lockup

in normal cruise the perpendicular forces on the aircraft have to equal what?

zero

what is L/Dmax

angle of attack

when is an aircraft considered to be trimmed?

when all the momets around the CG equal zero

what is endurance?

total time you can go

what is range?

total distance you can go

which drag increases and velocity increases?

parasite

what happens to surface friction during takeoff?

decreases because wieght shifts onto the wings

sum of all forces equation

(T-D) - µ(W-L)

T= thrust

D= Drag

µ= friction

W= weight

L= lift

what does newton’s second law say about the direction of acceleration?

same as the force

on landing what happens to friction as velocity decreases?

increases

what happens to aerodynamic drag as velocity decreases?

decreases

on landing approach what can I do to reduce the horizontal component of inertia?

• steeper approach

• hit the approach speed

low temperatures are high or low density?

high

high pressure is high or low density?

high

low humidity is high or low density?

high

five ways lifting off too soon increases total takeoff distance?

• aerodynamic braking

• stuck in ground effect

• induced drag goes up

• insufficient lift

• insufficient thrust

three items that determine landing roll friction?

• condition of runway surface

• breaking ability

• forces acting normal to runway

twelve ways to maximize deaceleration after touchdown

• negative thrust

• aerodynamic breaking

• flaps up

• spoilers

• anti-skid breaks

• land uphill

• land into the wind

• hit the side of a barn

• wheel braking

• opening the door

• speed brakes

• reversible pitch prop

what hydroplanes at a lower speed a 172 or 747

neither (its all about the tire pressure)

what are two reasons flaps help reduce landing roll distance?

• increases angle of descent

• slower airspeed

why does an approach angle effect inertia?

reduces horizontal component of velocity and reduces the flare distance

Newton’s first law

object in motion will stay in motion

Newton’s second law

F=ma

Newton’s thrid law

for action there is an equal and opposite reaction

what are the forces on a landing?

thrust, friction, and drag