Chapitre 1

Question 1

Buckingham’s pi theorem

Answer 1

If there are n variables in a problem and these variables contain m primary dimensions the equation relating all the variables will have ( n-m) dimensionless groups
- each fundamental dimension must appear in at least one of the m variables

Question 2

Airfoil nomenclature

Answer 2

Mean chamber line
Leading edge 
Trailing edge
Chord line 
Chord ,c 
Chamber

Question 3

Vertical stabilizer

Answer 3

Control yaw

Question 4

Rudder

Answer 4

Change yaw (side to side)

Question 5

Elevator

Answer 5

Change pitch( up and down)

Question 6

Flaps

Answer 6

Change lift and drag

Question 7

Aileron

Answer 7

Change roll

Question 8

Spoiler

Answer 8

Change lift drag and roll

Question 9

Slats

Answer 9

Change lift

Question 10

Fuselage (body)

Answer 10

Hold things together and carry payload

Question 11

Cockpit

Answer 11

Command and control

Question 12

Jet engine

Answer 12

Generate thrust

Question 13

Wing

Answer 13

Generate lift

Question 14

Horizontal stabilizer

Answer 14

Control pitch

Question 15

Common variables used

Answer 15

Pressure - pa 
Density -kg/ m^3
Temperature k
Velocity m/s 
Viscosity pa*s

Question 16

Incompressible subsonic

Answer 16

0

Question 17

Compressible subsonic

Answer 17

=0.3

Question 18

Transonic

Answer 18

=0.8

Question 19

Supersonic

Answer 19

=1.6

Question 20

Hypersonic

Answer 20

M > =5

Question 21

Boundary layer thickness

Answer 21

Is generally defined as the height above the surface where the velocity reaches 99% of the free stream velocity