Ramp Tramp....well done, you have correctly identfied the term "Dart", but its not from Piasecki!
So for clarity, this aircraft is the "(name of designer) Dart".
And at risk of repeating myself, the designer spent many years at Sikorsky.
What else, well he developed the GS1 aerofoil, and also did some work for Curtiss.
I'm sure a quick look at Aerofiles will give the answer!