Quadrotor Biplane The Common Research Configuration Research Quadrotor Biplane autonomously transitions between hover and forward flight to capitalize on the strengths of both flight modes. It is shown here at Aberdeen Proving Ground, Md., Dec. 8, 2020. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: Courtesy of the Army VIRIN: 201208-O-D0439-001A.JPG Photo Gallery