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Aerodynamic effects of five lift-fan pod arrangements on an unpowered V/STOL transport modelAn investigation was conducted in the Langley V/STOL tunnel to determine the effect of longitudinally oriented wing-mounted pods on the longitudinal and lateral aerodynamic characteristics in the cruise flight condition of a high-wing V/STOL transport model. Five pod arrangements were tested - three configurations with in-line pods at 20, 40, or 60 percent semispan and two split pod configurations with rear pods at 20 percent semispan and front pods at 40 or 60 percent semispan. In general, addition of the pods to the model decreased the stability, increased the lift-curve slope, and alleviated the abrupt stall of the basic model. The configuration with pods at 20 percent semispan had an abrupt instability at 10 deg angle of attack, All the configurations had lateral stability at sideslip angles from 5 to -5 deg. Very little difference in results existed between the configurations with pods at 40 and 60 percent semispan. Of the split pod configurations, the configuration with front pods at 40 percent semispan offered the best trimmed lift and lift-induced drag characteristics at high angles of attack. The configuration with in-line pods at 40 or 60 percent semispan provided the best cruise characteristics of all the pod configurations.
Document ID
19730015308
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Thomas, J. L. (NASA Langley Research Center Hampton, VA, United States)
Hoad, D. R. (Army Air Mobility R and D Lab. Fort Eustis, Va., United States)
Croom, D. R. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 2, 2013
Publication Date
June 1, 1973
Subject Category
Aerodynamics
Report/Patent Number
L-8754
NASA-TN-D-7199
Accession Number
73N24035
Funding Number(s)
PROJECT: RTOP 760-62-01-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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