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Dynamics of ultralight aircraft: Dive recovery of hang glidersLongitudinal control of a hang glider by weight shift is not always adequate for recovery from a vertical dive. According to Lanchester's phugoid theory, recovery from rest to horizontal flight ought to be possible within a distance equal to three times the height of fall needed to acquire level flight velocity. A hang glider, having a wing loading of 5 kg sq m and capable of developing a lift coefficient of 1.0, should recover to horizontal flight within a vertical distance of about 12 m. The minimum recovery distance can be closely approached if the glider is equipped with a small all-moveable tail surface having sufficient upward deflection.
Document ID
19770017109
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Jones, R. T. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 3, 2013
Publication Date
May 1, 1977
Subject Category
Aeronautics (General)
Report/Patent Number
A-6989
NASA-TM-X-73229
Accession Number
77N24053
Funding Number(s)
PROJECT: RTOP 010-01-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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