What is the maximum cruise speed of the HH-65 Dolphin?

• A. 165 knots
• B. 185 knots
• C. 195 knots
• D. 175 knots

Answer: (D)

Maximum cruise speed is the highest speed at which the helicopter can maintain level, steady flight in normal cruising conditions while still balancing power, rotor dynamics, and fuel economy. For the HH-65 Dolphin, the published value for this cruising limit is 175 knots. This speed represents a practical ceiling for efficient, extended flight—fast enough to shorten transit times, but not so fast that it forces excessive power demand or reduced range.

Higher speeds, such as 185 or 195 knots, would push beyond typical cruise envelopes and incur more power consumption and structural/handling stresses, making them unsuitable for regular cruising. A lower figure, around 165 knots, would simply be below the official maximum cruise limit. So 175 knots is the best choice because it reflects the aircraft’s designed balance of speed and efficiency for routine missions.