Chapters on Atmosphere, Speed, Lift, Drag Flashcards
Amount of Aerodynamic Force created is closely linked to the?
Air mass flow over the object.
Greater near sea level.
Air Density Decreases if?
Air Pressure Reduces.
Temperature Increases.
and
Humidity Increases.
Air Density equals?
Rho, which = Pressure over Temperature
Humidity facts?
Water vapour is lighter than completely dry air.
Air Density reduces when humidity increases.
Lower density reduces aircraft performance.
Kinetic Energy
Ek = 1/2mv^2
Air has kinetic energy
- Exerts dynamic pressure on an aircraft
Dynamic Pressure, q equation is?
q = 1/2 rho V squared Rho = density of air (or static pressure) V = True Air Speed
Dynamic Pressure facts?
Increases if Air density increases.
Increases rapidly if the TAS increases (square law).
The Airspeed indicator is a Dynamic Pressure Gauge
Total Pressure is?
Total Pressure = Static Pressure (rho) plus Dynamic Pressure (q)
Calibrated Air Speed, CAS is equal to?
The IAS corrected for instrument error and predictable pressure errors.
True Airspeed, TAS, is?
The actual speed of the aircraft through the air.
The IAS can exceed TAS when air Density is greater than 1.225kg per metre squared, such as when,
Close to the surface.
High pressure,
Cold day.
Equation of Continuity key fact?
The Air mass flow entering a stream tube must remain the same at all points along it.
Bernoulli’s Theorem key fact?
The sum of the static pressure plus the kinetic energy = Constant.
Total Pressure = ?
Static Pressure plus Dynamic Pressure.
Venturi Effect is?
When airflow lines converge together, speed increases. When airflow lines diverge, speed reduces.
Total Pressure = ?
= Static Pressure plus Dynamic Pressure.
which,
= Static Pressure plus half rho V squared.
4 Types of Aerofoil?
Symmetrical.
Positive Camber.
Negative Camber .
Bioconvex.