Found the article. Model Airplane News, February 1991.
Rotor blades were described as "...the most unusual profile I've seen on a rotorcraft;
it's somewhat undercambered, like a glider wing."

Also this item:
"You'll notice that you must use your rudders a lot more than when flying a plane."


Specs:
rotor diameter 58 inches, height 20 inches, weight 10 pounds.

mickey