Tandem-rotor (dual rotor lift) helicopters come in variants, such as front/back configurations where the rotors spin on parallel planes set apart at different heights – for example, see the old Piasecki YH-16 Transporter. Other helicopter rotors have a coaxial or “stacked” design, sharing the same rotor mast – see the Kamov KA-26 Hoodlum. This Kaman helicopter has two rotors that sit side-by-side, tilted away from each other but whose planes of rotation intersect. So, the rotors are timed in order to inter-mesh while spinning. One notable feat for a later derivative of the Huskie model is that it became the world’s first twin-turbine helicopter.
The first flight of this helicopter was in 1953 and eventually 193 were produced, serving in search-and-rescue and aircraft firefighting, primarily for the US Air Force, Navy, and Marines. In January 2019 I am informed by a Kaman employee that at least two of these helicopters are still in service somewhere in the world.
My model bears the livery colors of USAF search-and-rescue, and features gull-wing doors at the rear and an unblocked internal cabin area. I added some decals to the model, as shown in some of the pictures.
My model is 206 Lego elements. The picture of the actual machine is by the New England Air Museum (NEAM). The Wikipedia entry on the HH-43 lists nearly 20 air museums where a Kaman HH-43 Huskie is on display.