aerodynamic factors

Question 1

effective translational lift

Answer 1

occurs when the main rotor system completely outruns the recirculation of old vorticies and begins to work in relatively clean and undisturbed air and become much more effeicient

Question 2

transverse flow effect

Answer 2

is the differential of lift, drag, and induced flow that exist between the forward 1/2 and rear 1/2 of the rotor disc between 10-20 knots– the pilot experiences vibrations and right roll – there will be a more horizontal airflow over the forward 1/2 and a more downward airflow over the rear 1/2

Question 3

dyssy of lift

Answer 3

the difference of lift between that exists between the advancing and retreating halves of the rotor disc due to different airflow velocities

Question 4

compensate for dissy of lift

Answer 4

blade flapping and cyclic feathering

Question 5

airflow during a hover

Answer 5

2 types- induced flow and wing tip vortexes- both less durning IGE

Question 6

total aerodynamic force

Answer 6

resultant of lift and drag-

Question 7

settling with power

Answer 7

condition of powered flight in which a helicopter settles into into own downwash. also knowk as vortex ring state

Question 8

three things present for settling with power

Answer 8

1. low airspeed
2. vertical descent greater than 300 ft per min
3. 20- 100% of power available applied w/ sufficient power to stop descent

Question 9

dynamic rollover

Answer 9

the susceptibility of a helicopter to a to a lateral rolling motion

Question 10

physical factors

Answer 10

M- main rotor thrust
A- a/c cg/ low fuel
S- surface area/ slopes
T- t/r thrust
C- crosswind component

Question 11

human factors

Answer 11

S- slow corrective inputs
W- wrong corrective inputs
I- inattention
I- Inexperience
L- loss of visual references

Question 12

retreating blade stall

Answer 12

the retreating blade on a helicopter will tend to stall at high airspeeds because of the high angle of attack needed to compensate for the advance stage of dissy of lift

Question 13

conditions to cause retreating blade stall

Answer 13

L- low rotor rpm
T- turbulent air
L- loads- higher blade loading- high gw, 
A-altitude- high da
G-high G manuevers

Question 14

signs of retreating blade stall

Answer 14

1. abnormal vibration
2. pitching up of the nose
3. left roll

Question 15

corrective action for retreating blade stall

Answer 15

1. reduce collective
2. reduce airspeed
3. reduce the severity of the maneuver
4. reduce altitude
5. increase rpm

Question 16

three things to get into dynamic rollover

Answer 16

1. pivot point
2. exceeding critical angle
3. rolling motion