Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AT 106 > Lecture 8 > Flashcards

Lecture 8 Flashcards

1
Q

Heat Engines

A

Utilize heat energy to produce the power for propulsion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

2 Types of Heat Engines

A

Reciprocating
Gas Turbine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Engine definition

A

converts a source of energy into useful work

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the source of energy in an engine?

A

Fuel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the work the engine produces?

A

Heat expands gases creating pressure against a piston in a cylinder. The piston causes the crankshaft to rotate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is energy?

A

The capacity for doing work

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Law of Conservation

A

Energy cannot be created or destroyed- only changed from one form to another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Kinetic vs Potential Energy

A

Energy of motion
Energy of position or stored energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Normal Category G’s

A

+3.8 G, -1.52 Gs
Non acrobatic operations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Utility Category G’s

A

+4.4 Gs, -1.76 Gs
limited acrobatic operations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Normal Category G’s

A

+3.8 G, -1.52 Gs
non acrobatic operations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Positive G Loads

A

Centrifugal force acts in the same direction as WEIGHT- a downward force on the aircraft = you feel heavier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Negative G Loads

A

Centrifugal force acts in the opposite direction as WEIGHT- an upward force on the aircraft = you feel lighter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is a G load?

A

(weight caused by aerodynamic load)/ (weight of the aircraft)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Static vs dynamic stability

A

initial response vs long-term response

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Positive Static

A

Returns to initial position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Neutral Static

A

Stays in new position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Negative Static

A

Gets worse

19
Q

Yaw stability

A

Stability about vertical axis

20
Q

What maintains yaw stability?

A

Vertical stabilizer

21
Q

How do sweptback wings increase yaw stability?

A

The wing hits the air at an angle, air gets more time to climb up camber, less effective at making lift and thus less induced drag

22
Q

Pitch stability

A

Stability around the lateral axis

23
Q

How does the tail contribute to pitch stability?

A

Camber on the bottom of the tail uses Bernoulli Effect on the
bottom of the horizontal stabilizer, and creates negative lift

24
Q

How does negative lift contribute to pitch stability?

A

Weight / CG wants
to pull the airplane
nose down, but the
nose is being held
up by the force down
on the tail

25
Q

Primary purpose of high lift devices?

A

Increase the maximum coefficient of lift of an airplane

26
Q

Wing flap definition

A

a hinged, pivoted, or sliding airfoil usually near the trailing edge

27
Q

What are wing flaps for?

A

Used for landing. Increases the lift, drag, or both by increasing AOA and camber

28
Q

Split flap

A

Hinges a lower part of wing open.
Not good at producing lift, better for drag

29
Q

Slotted flat

A

Most effective flap. Lift greatly increased. Drag only slightly. There is a small gap between wing and flap.

30
Q

Fowler flap

A

Tucks into wing when retracted. Increases wing SA when deployed.

31
Q

Leading edge flap

A

Moves forward and droops down.

32
Q

Droop leading edge

A

Lowers AOA and raises camber as the air sees it.

33
Q

Kreueger leading edge

A

Lower AOA, increase camber, more rounded leading edge

34
Q

Aspect ratio equation

A

S^2/ A

35
Q

High aspect ratio wings are good because?

A

produce less induced drag

36
Q

Effective aspect ratio

A

gives the wings characteristics of a higher aspect ratio

37
Q

Elliptical wing

A

good lift, drag, stall characteristics

38
Q

Why does elliptical wing have good characteristics?

A

controls pressure differential and airflow along the span from root to tip

39
Q

Why are elliptical wings expensive?

A

each wing station is a unique size

40
Q

Winglets and sharklets do what?

A

reduce induced drag

41
Q

When wing tapers in thickness…

A

CP moves less when AOA changes
Max Cl greater
Lift curve is greater since all the wing does not reach max lift at once
C(d) is lower (notable at low AOA)

42
Q

When wing tapers in planform (chord)…

A

CP moves more when AOA changes
Max Cl greater
C(d) is lower (notable at high AOA)- reduced induced drag

43
Q

When wing tapers in both thickness and chord…

A

decreased and increased CP offset one another
Max Cl greater
Cd is low at both high and low AOA

AT 106 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions