TY - RPRT TI - Free wake analysis of hover performance using a new influence coefficient method AU - Quackenbush, Todd R. AU - Bliss, Donald B. AU - Ong, Ching Cho AU - Ching, Cho Ong PY - 1990 UR - https://ntrs.nasa.gov/citations/19910009737 ID - 19910009737 ER -