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Title: The tumble mode, where test pilots fear to tread
Authors: Gratton, GB
Newman, SJ
Keywords: Microlight;Tumble;Flexwing;Rogallo;BMAA;AAIB;Accident;BHPA
Issue Date: 2004
Publisher: Society of Experimental Test Pilots
Citation: Cockpit (Journal of Society of Experimental Test Pilots). 2004 (Apr-Jun) 34-53
Abstract: Following a fatal accident in 1997 and identification of common patterns in several (usually fatal) previous accidents the AAIB (United Kingdom Air Accidents Investigation Branch) asked the BMAA (British Microlight Aircraft Association) to pursue a course of investigation into the tumble mode, which had been attributed as the primary cause of that fatal accident. The tumble mode is a peculiarity of weightshift controlled aircraft - that is flexwing microlights and hang-gliders. It is a departure from controlled flight leading to a nose-down pitch autorotation: pitch rates of 400°/s are known. When a tumble occurs in a microlight aeroplane, it is rare for the crew to survive and loss of the aircraft is universal.
Appears in Collections:Aeronautics
Mechanical and Aerospace Engineering
Dept of Design Research Papers

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