POF Q5 - Intro to Drag part 2 Flashcards
Calculate the drag produced by the wing of a Diamond DA 40 which is flying at sea level at a TAS of 95 kt. The wing’s area is 14 m2, its CD is 0.06.
a.9388 Newtons
b.18775 Newtons
c.1229 Newtons
d.4643 Newtons
c.1229 Newtons
D = ½ x 1.225 x (95 x 0.5144)2 x 14 x 0.06
= 1228.67 Newtons
The types of drag we study in 2D flow are …… & ……. and can be collectively known as ……. drag.
a.Form drag, skin friction drag, profile drag
b.Form drag, induced drag, total drag.
c.Form drag, skin friction drag, total drag
d.surface drag, skin friction drag, form drag
a.Form drag, skin friction drag, profile drag
In the boundary layer, a steep velocity gradient is associated with which kind of flow?
a.Neither
b.A turbulent flow
c.Laminar flow
d.It is not dependant on the flow type
b.A turbulent flow
The correct drag formula is:
Select one
a.D = CD 1/2 1𝜌 V2 S
b.D = CD 2 𝜌 V2 S
c.D = CD 1/2 𝜌 V S
d.D = CD 1/2 𝜌 V2 S
d.D = CD 1/2 𝜌 V2 S
The aerodynamic drag of a body, placed in a certain airstream depends amongst others on:
Select one
a.The CG location of the body
b.The specific mass of the body
c.The weight of the body
d.The airstream velocity
d.The airstream velocity
A body is placed in a certain airstream. The airstream velocity increases by a factor 4. The aerodynamic drag will increase with a factor:
Select one
a.4
b.16
c.8
d.2
b.16
A body is placed in a certain airstream. The density of the airstream decreases to half of the original value. The aerodynamic drag will decrease with a factor:
a.2
b.1.4
c.4
d.8
a.2
The frontal area of a body, placed in a certain airstream is increased by a factor 3. The shape will not alter. The aerodynamic drag will increase with a factor:
a.3
b.9
c.1.5
d.6
a.3
The transition point, suction peak and pressure gradient force are all associated with what term?
[ ]
[Adverse Pressure Gradient]
The separation point moves
[ ]with an increase in the angle of attack (𝛼), and occurs
[ ] in a laminar flow.
[forwards] [earlier]
