POF Q9 - Whole Aircraft Drag Flashcards
Excluding constants, the coefficient of induced drag (CDI) is the ratio of:
Select one
a.CL² and AR (aspect ratio)
b.CL and b (wing span)
c.CL² and S (wing surface)
d.CL and CD
a.CL² and AR (aspect ratio)
Induced drag at constant IAS is affected by:
Select one
a.aeroplane weight
b.angle between wing chord and fuselage centre line
c.engine thrust
d.aeroplane wing location
a.aeroplane weight
High Aspect Ratio, as compared with low Aspect Ratio, has the effect of:
Select one
a.Increasing induced drag and decreasing critical angle of attack
b.Increasing lift and critical angle of attack
c.Increasing lift and drag
d.Decreasing induced drag and critical angle of attack
d.Decreasing induced drag and critical angle of attack
Which of the following airplane parts affect induced drag most?
a.Wing root junction
b.Wing tip
c.Engine cowling
d.Landing gear
b.Wing tip
The induced drag coefficient, CDI is proportional to:
a.√ CL
b.CL2
c.CL
d.CLMAX
b.CL2
What factors affect skin friction drag?
PICK 3 of 5
a.Boundary Layer Condition
b.Weight
c.Surface Area
d.Speed
e.Aspect Ratio
a.Boundary Layer Condition
c.Surface Area
d.Speed
When we look at total aircraft drag we can subdivide it into 2 main aircraft categories. These are; [xxxxxxxx] and [xxxxxxx].
Parasite Drag can be further split into [xxxxxxxx] and [xxxxxxx].
[xxxxxxx] is a combination of Form Drag and Skin Friction Drag.
[Parasite Drag] [Induced Drag]
[Interference Drag][Profile Drag]
[Profile Drag]
An aircraft in straight and level flight slows down to half its original airspeed. What happens to Induced Drag?
a.Induced drag increases by a factor of 2
b.Induced drag increases by a factor of 4
c.Induced drag decreases by a factor of 4
d.Induced drag decreases by a factor of 2
b.Induced drag increases by a factor of 4
An aircraft flying straight and level halves its airspeed. By what factor does the CDI increase?
16
An aircraft is going through a rebranding and the original paint is removed before being resprayed. This reduces the CDP by 0.1. Previously, before the rebranding, when flying at an IAS of 100kts, the parasite drag of the aircraft was 2,752,000N. The surface area of the aircraft is 320m2. What is the new CDP after the rebranding?
0.76
