11.1 Flashcards
Which form of drag is reduced by boundary layer control?
Reduced Drag
Which of the statements is true? (spoiler and speed brakes)
Spoiler and speed brakes always reduce lift and increase drag.
How are leading edge devices deployed?
By the same lever as for flap deployment.
Reguarding aerodynamic heating which material looses 80% of its strength at 250 degrees c?
Aluminium alloys
What can be said about changes in velocity, pressure and density in a shock wave?
Changes occur suddenly and sharply
What happens to the airflow as an aircraft approaches the speed of sound?
Areas of supersonic airflow increase and shockwaves move closer to the TE.
What is the increase in lift provided by the slat system?
35%
When does the boundary layer loose control with the surface?
When kinetic energy in the boundary layer is too low
What is the critical mach?
The point at which the local airflow reaches mach 1
When is a control surface correctly balanced?
When the centre of gravity is located at the hinge line
What is done to prevent extreme pressures and temps at the engine compressor during high speed flight?
One normal, three oblique shockwaves are formed to slow the airflow
What is the disadvantage of an anti balance trim tab?
The pilot requires more effort to deflect the control surface
Which tab uses a lever?
Control tab type
How is the profile thickness expressed in aerodynamics?
As a relationship between actual thickness divided by chord length.
