Question: The Sikorsky R-4 was a two-seat helicopter designed by a man that won the highest awardat the 1912 Moscow Aviation Exhibition for what airplane? 
Sentence (from "Sikorsky R-4"): The Sikorsky R-4 was a two-seat helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine.
Relevant evidence: Yes