Within the early 1980s, the Company for Superior Protection Analysis Initiatives (DARPA) got here up with the concept of NOTAR (no-tail rotor) applied sciences, which led to considerably quieter helicopters that might be operated with a decrease chance of detection. DARPA’s innovation resulted in a NOTAR vary of helicopters utilized by authorities businesses and the business sector.
The concept of a helicopter with out a tail rotor was revolutionary on the time just because a tail rotor provides the primary rotor of the helicopter a counterforce. Second, with out the sideways thrust generated by the tail rotor, the torque generated by the primary rotor would flip the physique of the helicopter in the other way.
On December 23, 1991, Kaman Plane launched the Ok-MAX (Ok-1200), a helicopter with interlocking rotors (synchropter) that doesn’t require a tail rotor, making the Ok-Max simpler and cheaper to take care of. These counter-rotating rotors give the Ok-MAX a pure tendency to drift and make it extra steady.
The Ok-MAX is designed to raise greater than its weight – 6,000 kilos – and makes use of simply 82 gallons of gas per hour through the raise. This makes it probably the most environment friendly lift-to-fuel ratio of any helicopter in its class. The Ok-MAX is right for exact lifting and positioning. Additionally it is priceless to firefighters, development firms, and the army.
Interlocking rotors on a helicopter are a set of two rotors rotating in reverse instructions, with every rotor mast mounted transversely symmetrically at a slight angle to the opposite. in order that the blades interlock with out colliding. The association permits the helicopter to work with out a tail rotor, which saves vitality. Nonetheless, not one of the rotors lifts straight vertically, which reduces the effectivity per rotor.
After Kaman Plane had been out of manufacturing for greater than a decade, it introduced in June 2015 that manufacturing of the Ok-MAX would resume after ten business orders had been obtained. The primary flight of a Ok-MAX from the newly began manufacturing occurred in Could 2017 and the primary new construct since 2003 was delivered on July 13, 2017 for hearth preventing in China.
Under is a video of Ok-MAX in motion.
Right here is one other video from KAMAN Ok-MAX