DQ-148

Question 1

Q1.

What conditions are required for dynamic rollover?

When is a critical angle introduced and which flight control (cyclic, pedals, etc.) affect it?

Answer 1

• Pivot point, rolling motion and exceeding the critical (dynamic) rollover angle.
• The critical angle is introduced when a rolling motion is present, and it varies by the rate of the rolling motion. All controls affect it.

Question 2

Q2. What are the flight indications of retreating blade stall?

Answer 2

Question 3

Q3.

What conditions must exist simultaneously for settling with power to occur?

What flight conditions are conducive to settling with power?

Answer 3

Three conditions needed (1,2,3)

• Vertical or near vertical descent of at least 300´/min
• slow forward airspeed - less than ETL
• 20-100 % available engine power applied.

Conducive (3 app, 2 hover, 1 fun thing)

• Steep approach
• Downwind approach.
• Formation flight approach
• Hovering above the maximum hover ceiling
• Not maintaining constant altitude control during an OGE hover.
• During masking/unmasking.

(Recovery)

• Initial state, a large application of collective,
• may arrest rapid descent.
• Cyclic to gain airspeed and/or lowering collective

Question 4

Q4. What is transient torque?

Answer 4

Transient torque is a phenomenon occurring in single-rotor helicopters when lateral cyclic is applied and is caused by aerodynamic forces. For conventional American helicopters where the main rotor turns counterclockwise, (figure 1-69) a left cyclic input causes a temporary rise in torque and a right cyclic input causes a temporary drop in torque.

(FM 3-04.203 para 1-141 pg. 1-55)

Question 5

Q5. What is bucket speed and explain how it is computed?

Answer 5

• Bucket speed is the airspeed range providing the best power margin for maneuvering flight. The most critical is lower speed since at higher speeds airspeed energy may be traded to maintain altitude while maneuvering. (When below minimum bucket speed reduce bank angle. Otherwise, altitude loss may become unavoidable.)
• Calc: Cruise chart, use 50% of max torque avail, go up and intersect with GWT twice, read low/high IAS = bucket speed range.
• (Image is example of 18,000 lbs GWT and 130% max TQ. Bucket speed range: 16-108 KIAS)