Sometime in the late 50's the US Army was interested in ordering 200 of Fairey's Type-Y "Rotodyne" to be manufactured under licence by Kaman.
The K-140 project would have been a US Rotodyne with a heavier gross weight of 82,836 lbs. Note the roof-mounted intakes.
The K-141 project seems to be an even larger, conventionally shaft-driven compound variant with a projected gross weight of 91,200 lbs. Note the V-tail with twin tail rotor configuration.
Another option for the Army's Kaman-manufactured Rotodyne appears to have been ducted propellers and a revised landing gear arrangement, according to the artist impression.
New York Airways was also interested in purchasing five Rotodynes for commercial use, with an optional fifteen meeting certain requirements. It appears that these would have also been manufactured by Kaman.
Thanks for shedding more light on this! I've never seen the Army Rotodyne with ducted props before.