Indeed the two rotors spinning in the opposite direction eliminate the tail rotor. This system is called a Flettner system and was invented by the German Anton Flettner during WWII. This system was then adapted by the Kaman company later.
The kit is from Attack Squadron, a Polish company. It is a resin kit with PE parts: high quality but not so easy to build.
The Kaman K-Max is one of the few - if not the only - helicopter that can lift more than its own weight.
And yes: in operation the rotors are offset 90° but for service they can be disengaged to any position. Having them parallel allows for storing in a narrow display case
20. July 2015 at 14:35:40