John Ackroyd (engineer)

John Ackroyd (born 1938) is a British aeronautical engineer known for his contributions to short take-off and vertical landing (STOVL) aircraft and rotorcraft technology. His career spanned both industry and academia, marked by significant work at the Royal Aircraft Establishment (RAE) and Cranfield University.

Ackroyd began his career at the RAE, where he specialized in fluid dynamics and propulsion. He made important contributions to the understanding of jet lift systems for STOVL aircraft, a key enabling technology for aircraft like the Harrier. His work involved both theoretical analysis and experimental testing of novel propulsion concepts.

Later, Ackroyd joined Cranfield University, where he served as a professor and head of the College of Aeronautics. At Cranfield, his research broadened to encompass a wider range of aeronautical topics, including helicopter aerodynamics and flight control. He also played a role in developing educational programs for aspiring aeronautical engineers.

Ackroyd is recognized for his technical expertise and for his ability to communicate complex engineering concepts clearly. He has published numerous technical papers and articles on topics related to aerodynamics, propulsion, and flight dynamics. His work has had a lasting impact on the field of aeronautical engineering, particularly in the development of vertical flight technologies. He has also been involved in various advisory roles to government and industry.