Kaman HH-43 Huskie at the Olympic Air Show 2012 in Olympia WA.
Another angle of this chopper with Twin counter-rotating main rotors, no tail rotor and complicated double-finned tail assembly.
The engine exhaust on the Kaman is far aft and downward (stovepipe) to compensate for the longitudinal pitch changes that accompany changes in torque. This exhaust arrangement minimized the coupling of pitch to torque.
The masts on the Huskie are at an angle of 26-degrees to each other. Their torque is operating in two planes. The torques from the two rotors cancel each other out in the horizontal yaw plane. In the pitch plane they both work in the same direction.
Huskies were once seen at every U.S. Air Force base, where they were used as firefighting and rescue craft. The Huskie was a common sight in Vietnam; now in civilian use only, and extremely rare.
Canadian Aviation Blog
Olympic Flight Museum