Chapter 2.1B - Exam Review Flashcards
The type of Drag which results directly from the production of Lift from the Wings is called (Parasite/Induced) Drag?
Induced Drag.
Will an increase in Angle of Attack increase or decrease the Induced Drag?
Increase.
As an Aircraft approaches its Stall Speed at an Angle of Attack of around 16°, Induced Drag will be at its (minimum/maximum) value?
Maximum.
What is the name given to the sum of all the Drag not directly associated with the production of Lift?
Parasite Drag.
What are the major components of Parasite Drag (3)?
- Skin Friction.
- Form Drag.
- Interference Drag.
Without the viscosity or ‘stickiness’ of the air creating a boundary layer around the surface of the Aircraft, would there be any Skin Friction or Form Drag?
No.
What causes Induced Drag?
Production of Lift.
In straight and level flight, low Airspeeds require (high/low) Angles of Attack and produce (high/low) Induced Drag?
- High.
- High.
Is Skin Friction increased or decreased with an increase in Airspeed?
Increased.
The low pressure area formed by turbulent wake behind an Aircraft as it moves through the air produces (Skin Friction/Form Drag)?
Form Drag.
In straight and level flight, at low speed/high Angles of Attack the turbulent wake is (large/small) and the Form Drag is (high/low)?
- Large.
- High.
Does the lowering of Flaps increase or decrease Form Drag? Why?
- Increase.
- Lowering the flaps decreased the streamlining and increases the size of turbulent wake.
Is the size of the wake and therefore the amount of Form Drag, increased or decreased with increases in Angle of Attack?
Increased.
The Drag which is produced by turbulent mixing of the airflow where various surfaces of the Aircraft meet or adjoin, is called what?
Interference Drag.
Parasite Drag is high at (high/low) Airspeeds?
High.
Induced Drag is high at (high/low) Airspeeds?
Low.
Parasite Drag is highest at the (stall speed/maximum level flight speed)?
Maximum level flight speed.
Does Induced Drag increase or decrease with increases in IAS?
Decrease.
What Airspeed/Angle of Attack combination produces the highest Parasite Drag (2)?
- Low Angles of Attack.
- High Speed.
The minimum Drag speed or speed for maximum Lift/Drag ratio, is the speed at which (Total Drag/Parasite Drag) is a minimum?
Total Drag.
At what Angle of Attack is an aerofoil at its most efficient or where the Lift/Drag ratio is at its maximum?
4°.
At Angles of Attack either greater or less then the Angle of Attack for maximum Lift/Drag ratio, the Lift/Drag ratio will (increase/decrease)?
Decrease.
The speed for maximum Lift/Drag ratio or the speed for minimum Drag is (the same as/less than/greater than) the best glide speed?
The same as.
The best glide speed is (the same as/less than/greater than) the speed for normal cruise?
Less than.
