The degree range is within which interval?

The degree range is within which interval?

• A. 0-5 degrees
• B. 5-10 degrees
• C. 10-15 degrees
• D. 15-20 degrees

Answer: (B)

The concept here is understanding the normal blade pitch range you’d expect during standard UH-60 operation. In hover and routine flight with typical weight and conditions, the main rotor blade pitch (collective) is usually set to a modest range that provides enough lift without pushing the engine and rotor system to their limits. That interval is about five to ten degrees. Why this range makes sense: with five degrees of pitch, you generate the lift needed to hold a steady hover under normal conditions without demanding excessive power. Pushing up to ten degrees gives additional lift when needed, yet remains within safe power margins and keeps rotor RPM and loads within their envelopes. Keeping the pitch within this range also helps keep the blade angle well below stall tendencies, reducing vibrations and control sensitivity. If you drop below five degrees, lift becomes insufficient for a stable hover unless you compensate with more power, which can strain the engine. If you go above ten degrees, you increase power requirements and rotor loads, approaching envelope limits where efficiency drops and the risk of issues like excessive vibration or control reactions grows. So, the best-fit interval for normal operation is the five-to-ten-degree range.

The concept here is understanding the normal blade pitch range you’d expect during standard UH-60 operation. In hover and routine flight with typical weight and conditions, the main rotor blade pitch (collective) is usually set to a modest range that provides enough lift without pushing the engine and rotor system to their limits. That interval is about five to ten degrees.

Why this range makes sense: with five degrees of pitch, you generate the lift needed to hold a steady hover under normal conditions without demanding excessive power. Pushing up to ten degrees gives additional lift when needed, yet remains within safe power margins and keeps rotor RPM and loads within their envelopes. Keeping the pitch within this range also helps keep the blade angle well below stall tendencies, reducing vibrations and control sensitivity.

If you drop below five degrees, lift becomes insufficient for a stable hover unless you compensate with more power, which can strain the engine. If you go above ten degrees, you increase power requirements and rotor loads, approaching envelope limits where efficiency drops and the risk of issues like excessive vibration or control reactions grows.

So, the best-fit interval for normal operation is the five-to-ten-degree range.