Forces In Descent Flashcards

1
Q

What is the descent angle

A

Angle between ac path through the air and local horizontal
Symbol y (gamma)

Pitch angle + AOA

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2
Q

What is the pitch angle

A

Angle between longitudinal axis and horizontal (shown on attitude indicator)
Pitch angle is less than the descent angle

Given as a negative value

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3
Q

Forces in descent parallel to flight (power on)

A

Drag = Thrust + W Siny

Thrust
Drag
Wsiny

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4
Q

Steeper descent will have a

A

Larger descent angle

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5
Q

Shallowest descent is at

A

VMD

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6
Q

Engine failure you will fly at…

A

Vmd for shallowest descent

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7
Q

Vx

A

Best angle of climb
Steepest climb angle
Operate most efficient at heigh
Slow speed

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8
Q

How do we manage drag

A

Speed and spoilers

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9
Q

Depressurisation what speed should you fly at

A

VMO for most excess drag

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10
Q

Drag in a descent formula

A

T + weight x siny = drag

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11
Q

WSINY =

A

Drag - Thrust
——————
Weight

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12
Q

In a glide descent forward component is what to drag

A

Equal as no thrust

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13
Q

Calculating glide range

A

X lift by the range altitude
Convert ft to nm (6080ft in 1nm)

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14
Q

Gliding with head wind

A

Range reduces

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15
Q

Gliding with tailwind

A

Range increases

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16
Q

Mass impact on glide range

A

Does not affect in still air heavy ac will simply just reach ground quicker in same location

17
Q

Heavy A/C in headwind glide range

A

Will be in air less time therefore less effected so slightly better range than a lighter ac

18
Q

Tailwind and mass

A

Light a/c will have greater range due to being in air longer

19
Q

X2 Factors effecting glide range

A

Flaps - reduce L/D ratio and glide range
Speed - flying faster or slower than vmd

20
Q

Glide endurance speed is

A

Vmp (0.76 vmd)
Useful for gliding over sea
Vmp is the minimum speed for power

21
Q

AOA is always expressed as

A

A positive number of degrees

22
Q

Pitch angle is always

23
Q

In steady power off descent which force drive ac down descent flight path?

24
Q

CDFA Is + advantages

A

Continuous descent final approach

Certain power setting all the way down the descent saves fuel/reduces engine wear and reduces air and noise pollution

25
Glide angle of descent is the ratio of
Height lost to the horizontal distance travelled
26
Best glide gradient factors
Vmd Best L/D ratio CLMAX/CD
27
Formula for descent angle
Pitch Angle + AOA (Always negative) (always positive)
28
How does calculating angle of descent differ from calculating angle of climb
Angle of descent uses = siny = drag - thrust —————- Weight Angle of climb uses = siny = thrust - drag —————— Weight
29
Calculating drag/weight or descent angle in powered off glide
Siny = drag ——- Weight
30
Glide range formula
Height x L/D ratio
31
Glide range formula with winds
Glide range in still air x ground speed/original TAS
32
Mass on glide range
Heavy ac will glide same distance if both fly at Vmd More induced drag on heavier so has to fly faster vmd so will reach ground quicker
33
Flaps and landing gear on glide range
Reduces due to increased drag Steeper glide path and reduced endurance
34
Headwind will do what to glide range
Reduce distance covered over the ground Does not effect rate of descent
35
Tailwind on glide range
Increase our speed Cover more distance No effect on endurance
36
Shallowest glide angle is achieved when aircraft is gliding
At the speed which equates to best L/D ratio
37
Which force drives ac down the descent angle in power on and off descent?
Weight Driving factor for an aircraft down the descent flight path
38
On a drag polar curve where is VMP to VMD
VMD is always below VMP on a CL/CD graph