Thrust commercial class 10

performance limitations

what section of POH shows performance charts?

section 5, always

section 7 of the POH is

operation procedures

GLEN P WASO

general

limitations

emergency procedures

normal procedures

performance

if you are sitting the pilot seat, what direction does the prop spin?

clockwise

what spins faster—spinner or prop edge?

prop edge/tip because it covers more distance over time

what aircraft had a prop faster than mach 1, and because it broke the sound barrier

thunderscreech (lockheed xf84-H). So loud the vibrations made people nauseous

why can’t our prop go above 2700rpm

it would be oversped and spin off the aircraft due to pressure build up as the prop tips approached mach 1

when in a left turn, which wing moves faster?

the right, because it covers more distance over time

why is a pitot mast on the nose more accurate than a pitot mast off the wing?

is 30.03 an altimeter setting that would yield higher or lower pressure?

higher pressure (p. altitude would be below field elevation)

max tailwind of the archer?

5!! because the performance limitation chart only goes up to 5 on the tailwind side

what is standard temp for addison?

14C (15 is normal, our field elevation is 645, and standard lapse rate is -2 per 1000)

standard temp for denver, colorado?

4c

what is the lowest point in North America?

Badwater Basin in California, and it is almost 300ft below sea level

in a tailwind, indicated changes or doens’t? does groundspeed change?

indicated does not, but groundspeed does! because groundspeed corrects for wind

best glide vs minimum sink—which is a lower airspeed?

minimum sink is a lower airspeed

density altitude formula

(current temp minus standard temp at field elevation) x 120 + PA

how many degrees C is 100f?

38c

32C is how many F?

90

15C (standard) is how many F?

59F

density altitude impacts what 4 main things?

climb, lift, engine output, groundroll

when using alt air, the engine performance is (better/worse) because the air is LESS dense

worse

what is the power curve

shows drag vs lift

interference drag examples

happens at 90 degree angles from aircraft

what is wave drag?

airliner drag when you are almost supersonic or about to break sound barrier (mach 1). The wave forms on the wing and slowly moves back. It causes an airflow disturbance

you experience the area of reverse command when below what speed?

Vg

where do you find stall speed and max efficiency on a power curve?

stall = left end

max efficiency = low point

MAC meaning

mean areodynamic chord,

shows where center of gravity is over the wing.

CG should be BEHIND the center of lift

define static stability vs instability

• Static Stability: CG ahead of CP → the vehicle naturally returns to equilibrium.

• Static Instability: CG behind CP → the vehicle tends to diverge from equilibrium.

RFASLS what does it stand for

Range
Fuel burn
Airspeed
Stability
Landing flare
Stall speed

with a forward CG, your fuel burn (increases/decreases)

increases

why does airspeed increase with an AFT CG?

less trim drag

lower tail-down force required to maintain stability

weight x arm =

moment

define arm

The horizontal distance from a chosen reference point (datum) to the center of gravity of a component or item

In our plane, it’s tip of spinner to CG

where does our arm begin per POH

78.4 inches forward of leading edge of wing (AKA at the spinner)

why do airlines load front to back?

so the plane begins with a more forward CG and the tail doesn’t tip down when it’s loaded in the back

define angle of attack

chord line to relative wind

the chord line is the

imaginary line between leading and trailing edge of wing

angle between chord line and relative wind

angle of incidence

why can’t we fly overweight?

load factor!

lift must exceed weight for takeoff, and in steady state flight lift can equal weight

what are our load factors in normal mode for our plane?

3.8G to -1.5G (pos and neg)

what are our load factors under utility category

4.4G to -1.7G

2 compoments of lift

vertical and horizontal lift

in normal steady flight we have vertical lift

in a bank we trade for horizontal

what is the load factor when you bank 60 degrees

2G

stability is measured by the length of the

arm

define arm

neutral point - CG

define stability

tendency of aircraft to return to normal

static vs dynamic stability

static is immediate

dynamic is over time (long term)

positive static

holds original attitude

negative static

moves further away from original input

neutral static

holds new attitude

postive dynamic

overtime goes back to normal/level flight

neutral dynamic

overtime stays new oscillation

negative dynamic

overtime oscillation gets more extreme

you always want your aircraft to have (pos/neg/neutral) static and dynamic stability

positive

fighter jets often use (dihedral or anhedral) wings to increase agility

anhedral

aft CG has less wing loading which makes the aircraft…

less stable, with cruise, lower induced drag, more pitch sensitive