Block 2 Flashcards
(147 cards)
What is Bernoulli’s Principle?
Pressure decreases at points where speed increases
Helps achieve lift
Speed /^\
Pressure \v/
Think of placing thumb over a hose
On a wing, the low pressure system is located where?
Above the wing
What is Newton’s 3rd Law?
Every action has an equal and opposite reaction
How does Newton’s 3rd Law assist with lift?
Acts as a secondary source as an upward force is generated by air striking the underside of an airfoil and being deflected downward.
The primary source of lift on an airfoil is created by a differential in _____.
Pressure
Relative wind for an aircraft flows in which direction?
Opposite to the direction of flight
What is an airfoil?
Anything that helps to produce lift
What are the 3 principle airfoils?
Wing
Horizontal Tail Surface
Propeller
What is the Chord Line?
A straight line from the leading edge to the trailing edge
Define Angle of Attack
The acute angle formed between the chord line and the relative wind
Define Camber
The curvature of the airfoil
Name the 3 primary wing platforms
Straight/Tapered
Delta
Sweptback
Name the 4 forces of flight
Lift
Weight
Thrust
Drag
What are the 3 key properties of the atmosphere?
Temperature
Altitude
Water Vapor
As _____ increasese, the temperature decreases on average by ____ degrees F every _____ ft.
3.5 degrees Fahrenheit every 1,000ft
What is Lapse Rate?
A decrease of temperature with height
Which air is denser? Warm or cold?
Cold air is denser than warm air.
As altitude increases, pressure ______.
Decreases
Lower pressure results in (less or more) dense air.
Less Dense Air
for lower pressure
The _____ (higher/lower) the temperature, the greater amount of water vapor the air can hold.
HIGHER
Water vapor replaces air so more speed is necessary in high temperatures due to less air molecules in the air b/c of the water vapor replacing it.
An increase in water vapor causes what?
a decrease in air density.
Water Vapor UP
Air Density DOWN
define Density Altitude
The altitude in the standard atmosphere corresponding to a particular value of air density
define Density
The mass of air per unit volume
What is an Adjustable Pitch propeller?
A prop that can only be adjusted by hand on the ground