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Systematic model researches on the stability limits of the DVL series of float designsTo determine the trim range in which a seaplane can take off without porpoising, stability tests were made of a Plexiglas model, composed of float, wing, and tailplane, which corresponded to a full-size research airplane. The model and full-size stability limits are in good agreement. After all structural parts pertaining to the air frame were removed gradually, the aerodynamic forces replaced by weight forces, and the moment of inertia and position of the center of gravity changed, no marked change of limits of the stable zone was noticeable. The latter, therefore, is for practical purposes affected only by hydrodynamic phenomena. The stability limits of the DVL family of floats were determined by a systematic investigation independent of any particular sea-plane design, thus a seaplane may be designed to give a run free from porpoising.
Document ID
20050242069
Acquisition Source
Headquarters
Document Type
Other - NACA Technical Memorandum
Authors
Sottorf, W.
Date Acquired
August 23, 2013
Publication Date
January 1, 1949
Subject Category
Aircraft Stability And Control
Report/Patent Number
NACA/TM-1254
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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