Aeroplane Aerodynamics and Flight Controls I
What are the three axes an aircraft in flight is free to rotate about?
Lateral, Longitudinal, vertical
Why do some aircraft use a rudder limiter?
To limited rudder travel as a function of the aircraft speed.
The amount of limitation applied keeps the loads exerted on the structure below the maximum allowable limit, yet maintains the authority necessary to enable aircraft trimming throughout the flight envelope. This includes the ability to correct for asymmetric flight caused by an engine failure on multi-engine aircraft.
When are drag inducing devices used?
Approach and rapid descent, landing
What is the speed of sound dependant on
Temperature
what is supersonic flight classified as?
Supersonic speed is above Mach 1.20
Name three controls that control rotation around the longitudinal axis?
Ailerons, spoilers, elevons, flaperons
When deployed a split flap increase the ______ of the wing
Camber
What are the two locations the speed brakes can be located?
Fuselage and wing
What is the doppler effect
the frequency of sound waves emanating from a moving object relative to a stationary observer
what is the critical mach number
the aircraft speed at which some of the air flowing over the wings is accelerated to Mach 1.0.
Name three controls that control rotation around the Lateral axis?
Elevators, ruddervators, elevons, stabilators, trimmable horizontal stabilizers, variable incidence horizontal stabilizers
Camber and surface area of a wing are increased with what type of trailing edge flap
Fowler and slotted fowler flaps
What parameters are required to be met before automatic ground spoilers fully deploy?
A/C on ground, wheels sped up, speed brake lever in armed position. throttle position at idle
what is a Mach number
The Mach number (M) refers to the speed at which an aircraft is travelling in relation to the speed ofsound.
what is formed at a point on the upper surface of the wing when the pressure waves from the rear of the wing, that are trying to move forward, meet air travelling at exactly the same speed flowing backwards.
Normal Shock wave
Name two controls that control rotation around the Vertical axis?
Rudder, Ruddervator,
Krueger Flaps, Drooped Leading Edge Flap, Slots and Slats are?
High lift leading edge devices
What are Boundary layer control devices are designed to do?
delay airflow separation over the wing
what is sub sonic flight classified as?
Flight below Mach 0.75
what design feature is used to increase the MCrit
thin aerofoils or swept back wings
What is a canard wing and what is its advantage?
The canard is the forward lift surface and is often also a control surface
almost impossible to stall
What happens to the stall angle when trailing edge flaps are deployed?
Decreases
What are stall strips used for?
to initiate stall on a certain section of the wing.
what is transonic flight classified as?
flight between Mach 0.75 and 1.20
What happens to the airflow when it passes through a normal shock wave.
theairstream slows to a subsonic speed with a large increase in its static pressure and density.