aero Flashcards
which wing is more ideal aerodynamically
elliptical
which wing is somewhat more superior aerodynamically
high wing
what wing is least expensive to manufacture
rectangular
most expensive wing
elliptical
what’s the best compromise between all types of wings
tapered rectangular
what is the most important factor in determining the power plant of an airplane
power/weight ratio
what is the part that most enhances the visual appeal of an airplane
tail
of all wings out there what wings provide the best lateral stability
high wing
what category airplane is cat is far 23
utility
what aerodynamic benefits are there with a swept tail
NONE
of all aircraft manufacturers before 1970 which one was most successful with drag cleanup
mooney
what are the main advantages of canard airplane
nose up lifting force
high lift/drag ratio
reduction of drag
harder to stall recovery is easy
high aspect ratio increase or decrease aircraft performance
increase
what’s a disadvantage of canard airplane
less cg range
longer ground roll
very careful balancing between canard and wing
canard lifts nose up all the time could be destabilizing
on flying wing that short arm from leading edge to the center of wing means that you have a lower cl max on a wing what does that do for ground roll
increase significantly
how do you get tail down force on a flying wing
back of wing is curled up
reflexive tail
sweet back wings allow planes to Travel faster how?
decreases critical Mach number
increasing effective aspect ratio of wing
reducing induced drag
increases climb performance and range
decreasing ground roll distances
what is stability
tendency of an airplane to returned to a trimmed position after a disturbance
what opposes load factor
resultant component of lift
dynamic stability
stability over time
for a plane to be dynamically stable what must it have first
static stability
what is the definition in speed of supersonic
Mach 1.2 -5
when am airfoils upper surface has reached Mach 1 what have you hit
critical Mach number
what happens to drag at critical Mach
significantly increases
proppellers take a _________amount of air and create ________ amount of velocity
large , small
what’s the definition of Endurance
most time aloft on a given amount of fuel
how do you determine aspect ratio of a wing
span of wing divided by average chord
air molecules moving over the upper surface of the wing travel faster or slower than the bottom of the wing
faster
what do vortex generators do
Imparts energy into the airfoil to keep air laminar
most expensive engine
turbojet engine engine
what is least expensive engine
reciprocating engine
best fuel conservation
reciprocating engine
when bank angle increases what also increases
stall speed / load factor
as airspeed increases what also increases
induced drag decreases with airspeed
what is specific fuel consumption
pg 226
aspect ratio
span divided by mean chord
what happens to a plane in ground effect
induced drag is reduced because the wingtip vortices aren’t fully formed under wing
why is LD max important
maximum glide speed and max glide angle
newton third law
for every action there is an equal and opposite reaction
Newton’s first law motion
an object at rest sill stay at rest
newtons 2nd law of motion
an object at rest will stay at rest unless something affects it
what is the line from leading edge from camber to trailing edge
mean camber line
when airflow over the wing adheres to the surface what kind of airflow is it
laminar
what can upset laminar airflow
exceeding the critical layer of attack
ice
rivets
spoilers
what is the one factor that increases induced drag more than another factor
slow flight high angle of attack
what is the best thing you can do. together. the minimum amount of induced drag
clean configuration cruise flight
definition of range
max distance for given amount of fuel
5-27
load limit va
three axis of flight center of gravity
an
what kind of stability does aileron deflection affect
lateral
what kind of stability Is determined by CG
longitudinal
what stability does Dihedral affect
lateral
elevator Affects what stability
longitudinal
fuselage effect affects what stability
longitudinal
tail down force affects what stability
longitudinal
vertical stabilizer
directional
weathervaning effects what stability
directional
wing taper affects what stability
lateral
horizontal stabilizer affects what type of stability
longitudinal
what do vortex generators on top of the wing do?
impart energy to the wing to aid the laminar flow of air
under 12500 lbs
FAR 23
largest develop,ent in aviation in the last 100 years
the jet engine
write the coefficient of lift formula and choose the two areas that pilots have control over
Cl= lift/ 1/2 dynamic pressure x V^2 x SA
calculate the rate of climb for excess engine power
RC= (changeP) x 33,000
