OPERATING COST REDUCTION THROUGH HELICOPTER CRUISE FLIGHT OPTIMIZATION

The paper shows that optimization of prolonged flight conditions (cruise and high-endurance cruise) results in substantial fuel saving: up to 5-10%. Thus, fuel costs are also reduced. It gives the description of the device used in flight by the crew to define which of the flight conditions is optimal, shows how to control the main rotor speed in flight and how to perform actual flights under optimal flight conditions. It is proved that the capability to define optimal flight conditions results in a higher rate of climb and service ceiling of the helicopter as well as in a lower rate of descent if one engine fails. The above capabilities plus the capability to determine exactly the range under actual flight conditions contribute to improved flight safety.