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Aerodynamic penalties of heavy rain on a landing aircraftThe aerodynamic penalties of very heavy rain on landing aircraft were investigated. Based on severity and frequency of occurrence, the rainfall rates of 100 mm/hr, 500 mm/hr, and 2000 mm/hr were designated, respectively, as heavy, severe, and incredible. The overall and local collection efficiencies of an aircraft encountering these rains were calculated. The analysis was based on raindrop trajectories in potential flow about an aircraft. All raindrops impinging on the aircraft are assumed to take on its speed. The momentum loss from the rain impact was later used in a landing simulation program. The local collection efficiency was used in estimating the aerodynamic roughness of an aircraft in heavy rain. The drag increase from this roughness was calculated. A number of landing simulations under a fixed stick assumption were done. Serious landing shortfalls were found for either momentum or drag penalties and especially large shortfalls for the combination of both. The latter shortfalls are comparable to those found for severe wind shear conditions.
Document ID
19820022422
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Haines, P. A.
(Dayton Univ. OH, United States)
Luers, J. K.
(Dayton Univ. OH, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1982
Subject Category
Air Transportation And Safety
Report/Patent Number
NASA-CR-156885
NAS 1.26:156885
UDR-TR-82-26
Accession Number
82N30298
Funding Number(s)
CONTRACT_GRANT: NSG-6026
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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