Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Investigation of the Thwaites Airfoil Principle as Applied to Helicopter Rotor Blades

Report Number: WADC TR 53-497
Author: Arnold, L.
Author: Yuan, S. W.
Corporate Author: Lee Arnold Associates, Inc.
Laboratory: Aeronautical Research Laboratory
Date of Publication: 1954-01
Pages: 86
AD Number: AD0046678

Abstract:
A performance calculation has been carried out for the purpose of comparing the Piasecki XH-16 rotor vith the Karman-Yuan rotor. The two rotors ,atre asi%ned identical in size and lifting capacity (rotor diameter 82 ft, gross weight 36600 lbs). The Piasecki rotor blade is equipped with an NACA 0015 airfoil and the Karman-Yuan rotor blade vith an elliptical airfoil of 18% thickness chord ratio and cyclic flap control. The controllable lift distribution along the blade span of the Karman-Yruan rotor is achieved by varying the spanwise flap location and applied boundary layer suction. Due to the high lift coefficient employed in the Karman-Yuan rotor blade it was found that a lower rotational speed can be used to sustain the same gross wieght as does the XH-16.

Contrails does not possess a copy of this report. Click here to offer Contrails a donation of this report

Other options for obtaining this report

Via the Defense Technical Information Center (DTIC):
A record for this report, and possibly a full-image download of the report, exists at DTIC

Via National Technical Information Service:
The NTIS Order Number for this report is: AD046678
This report may have been digitized and made freely available for public download, or made publicly available for purchase by the National Technical Information Service through their online database, the National Technical Reports Library

Indications of Public Availability
No digital image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement