When designing rotor blades for a new helicopter, the length is often decided based on the intended application. With longer helicopter rotor blades, more powerful lift can be achieved which is optimal for carrying heavier loads. Smaller blades on the other hand allow for less drag and faster achievable speeds. With the advent of new technology and capability, the ability to have both types with the same rotor may soon become a reality.
While the concept of adjusting rotor blades has been long sought after, the idea has been limited by the ability to actually retract rotors due to centrifugal forces and friction creating the need for powerful actuators. One proposed solution is the use of springs that control rotor length. These springs would allow the blade to expand as the rotor spins faster, and as they slow down, the spring would then retract the blade. Utilizing springs, there would be no need for motors as centrifugal forces and springs alone would draw in and release the blades as needed during flight.
With proposed technology such as this, helicopters would be able to have more versatile operations. Take off would be much easier from tight corridors, even when carrying heavier loads. This also eases flight in more compact areas where longer blades may pose a hindrance or danger. Currently, the technology has not been utilized in flight, but tests have shown a 25% increase in length with current ability.
Other factors that have been researched to improve the versatility of helicopter flight include sweep, chord, and tip shape. Through manipulating different parts of the blade, more maneuverability and fuel efficiency may be achievable alongside speed and payload ability. Due to this interest and desire for adjusting rotor blades, many manufacturers and researchers have a vested interest in this future technology that soon may the norm.
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