Flight Characteristics Flashcards

1
Q

Blade tips move at ________.

A

725 ft/sec

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2
Q

The MH-60R is considered to be in ground effect below what altitude?

A

45 ft

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3
Q

Flapping fixes _____________. By reducing lift on the _________ blade and increasing it on the ___________ blade by flapping _________.

A

Asymmetrical distribution of lift

Advancing

Retreating

Flapping down

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4
Q

Phase lag is felt ______ degrees from where the inputs are put in.

A

90*

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5
Q

Define blowback

A

In a hover the advancing blade sees more lift than the retreating blade. Causing the rotor to be tilted aft.

Pilot input and auto pilot will counter this

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6
Q

Translational lift is at approximately what?

A

17kts

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7
Q

Transitioning to forward flight with tail winds will cause you to see _________ when you have relative winds of zero.

A

More power required.

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8
Q

Stab begins programming at what?

A

30 kias

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9
Q

Methods to eliminate Blade Stall?

DRAAGS
SCAARG

A
Decrease Collective Pitch
Rotor Rpm increase
Airspeed reduce
Altitude reduce
Gross weight reduce
Severity of maneuver (reduce)
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10
Q

Blade Stall happens when

A

The retreating blade has increased is AOA so much that it has stalled.

The blade tip is traveling at rotational speed minus forward airspeed of helicopter.

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11
Q

Weather vaning is what?

And occurs when?

A

Winds push on the tail and cause the helicopter to rotate into the wind.

120* to 240*

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12
Q

What is tail rotor vortex ring state?

What region does it occur in?

A

The tail rotor operates in its own airflow. Causing unpredictable yaw rates

210* to 330*

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13
Q

Main rotor disc vortex interaction is what?

Occurs in What region?

A

Main rotor vortex is directed onto the rotor changing the AOA on the tail rotor.

280* to 330* and possibly 030* to 080*

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14
Q

How can you recover from LTE?

A

Lowering collective

Forward cyclic

In a hover, applying full left pedal.

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15
Q

Vortex ring state occurs when?

When are they worst?

A

Descent rates greater than 700 fpm and 0 - 20 kias

Descent rates of 1500 fpm and 5 - 10 kias

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16
Q

How do you recover from vortex ring state?

A

Decrease collective pitch

Increase forward airspeed

Enter autorotation if altitude permits.

17
Q

Regions of prop during autorotative state?

A

Prop region- 30%
Autorotative-45%
Stall region - 25%

18
Q

Prop region creates _______.

A

Usable lift

19
Q

The autorotative region creates __________________.

A

Lift and rotational forces

20
Q

Stall region creates only ___________.

A

Drag forces

21
Q

When does static Rollover occur?

A

28*

22
Q

Critical rollover occurs at?

A

12*

23
Q

How does aircraft respond to rotor blade Stall?

A

Increased vibs

Pitch up

Roll left

24
Q

When does vortex ring state occur?

A

0-20 kias & greater than 700 fpm

Worst at 5-10 kias & 1500 fpm

25
Q

Why does a heavier helo auto slower than a lighter helo?

A

Higher collective pitch is required to control Nr of heavy aircraft. This results in more lift from the rotors and a slower rate of descent.

26
Q

Order of preference with abnormal vibrations?

A

Runway

Large deck

Small deck

Running landing not recommended. Land on a spot.

27
Q

What type of drag is dominant at slow speeds and in a hover?

A

Induced

28
Q

Securing one engine allows a/c to operate at ___ speeds, where drag is ___, while operating a single engine at a more efficient power setting

A

Slower, reduced

29
Q

__ roll rates of __ deg/second in forward flight above __ KIAS, can combine with induced tail rotor gyroscopic and flapping loads to cause excessive tail rotor spar loading

A

Left, 30 deg, 75 KIAS

30
Q

Airspeed for moderate turbulence

A

blade stall - 15 knots

31
Q

Airspeed for light turbulence

A

blade stall - 10 knots

32
Q

Tail Rotor Spar Loading

A

Left roll rate increases blade AOA, driving torque up and main rotor precession loads can contribute further

Left roll rates (above 30 deg/sec in forward flight above 75 KIAS) can combine with induced tail rotor gyroscopic and flapping loads to cause excessive spar loading

33
Q

When executing high roll rate maneuvers to the left, you should

A

Lower collective concurrently with maneuver initiation to control transient torque increases and reduce high TR spar loads

34
Q

Speed for translational lift

A

17 KIAS