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Effect of Helicopter Performance of Modifications in Profile-Drag Characteristics of Rotor-Blade Airfoil SectionsRough conventional, smooth conventional, and laminar-flow or low-drag sections were tested. The items covered are rotor thrust for fixed power in hovering, range and endurance at cruising speed, and power required at high-forward speed. Calculations indicated that a smooth conventional section gives marked performance gains. Smaller gains are obtainable by using a low-drag section. At high speeds or loads the low-drag section is inferior to the smooth conventional section.
Document ID
19930093589
Acquisition Source
Legacy CDMS
Document Type
Other - NACA Wartime Report
Authors
Gustafson, F.B. (National Advisory Committee for Aeronautics. Langley Aeronautical Lab. Langley Field, VA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1944
Subject Category
Aerodynamics
Report/Patent Number
NACA-WR-L-26
NACA-ACR-L4H05
Accession Number
93R22879
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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