POF Cambers

Question 1

Camber line follows the

Answer 1

Curve of the aerofoil from leading edge to trailing edge.

Question 2

Chord line

Answer 2

Straight line, leading edge to trailing edge

Question 3

Angle of attack increases, so does

Answer 3

Coefficient of Lift
CL
Up until 16⚫️ alpha

Question 4

Coefficient of Lift
CL
Depends on

Answer 4

Reynolds number
AOA
Camber
Thickness (of wing, from top to bottom)

Question 5

Flaps are extended to increase

Answer 5

The camber of wing.

To increase CL, with a smaller AOA

Question 6

Narrow leading edge, means a high speed aerofoil this

Answer 6

Performs well at high speed

Question 7

The 2 Components of Total reaction

Answer 7

Lift & drag

Question 8

1 st way of solving CL questions:

Answer 8

Rearranging CL equation, on both sides.

Question 9

2nd way of solving CL questions:

Answer 9

NEW SPEED =

old speed X squareroot[new mass/old mass]

Question 10

3rd way of solving CL equations

Answer 10

NEW CL=

(New mass X old CL) / old mass

Question 11

Types of drag:

FORM DRAG?

Answer 11

A resistive force. Leading edge high pressure goes to trailing edge lower pressure.

Static pressure build up at the stagnation points.

Question 12

Form drag / pressure gradient is dependent on

Answer 12

Difference of pressures

Distance between pressure pockets

Question 13

Types of drag:

SKIN FRICTION

Answer 13

Layer of air above surface skin is viscous, up until the boundary layer. It is then inviscid. Air flow is smoother higher up because surface skin plays less role.

Question 14

Smooth flow is

Answer 14

Laminar

Question 15

Boundary layer for turbulent flow is greater than the

Answer 15

Laminar flow

Question 16

Types of drag:

ADVERSE PRESSURE GRADIENT

Answer 16

Reduced static pressure from leading edge, where dynamic pressure higher, flowing down the aerofoil to the higher static pressure build up at the trailing edge.

Question 17

Types of drag:

AIR FLOW SEPARATION

Answer 17

Air flow separates from aerofoil. Where is separates, area of low pressure appears. Air fills these areas of low pressure (flow reversal), not good for airflow generating lift.