Engineering topics

Biggers, James C.

Publications and source records attributed to Biggers, James C..

3 records

NASA NTRS2015

Tests of Full-Scale Helicopter Rotors at High Advancing Tip Mach Numbers and Advance Ratios

As a continuation of the studies of reference 1, three full-scale helicopter rotors have been tested in the Ames Research Center 40- by SO-foot wind tunnel. All three of them were two-bladed, teetering rotors. One of the rotors incorporated the NACA 0012 airfoil section over the entire length of the blade. This rotor was tested at advance ratios up to 1.05. Both of the other rotors were tapered in thickness and incorporated leading-edge camber over the outer 20 percent of the blade radius. The larger of these rotors was tested at advancing tip Mach numbers up to 1.02. Data were obtained for a wide range of lift and propulsive force, and are presented without discussion.

High Advancing Tip Mach Numbers↗

NASA NTRS1987

X-wing potential for Navy applications

The X-wing provides a VTOL aircraft which has a low disc loading hover capability, similar to a conventional helicopter, combined with a high subsonic cruise speed capability. As a result, it hovers with low fuel flow rates which make extended hover duration missions practical. Its low hover power requirements also permit hovering and low speed flight on only one engine in a high speed twin engine aircraft design. The NASA DARPA Sikorsky RSRA X-wing program developed flightworthy X-wing hardware. All design activity and the majority of its component fabrication is completed. A design study was performed on an X-wing concept demonstrator aircraft which is based on the RSRA X-wing components, combined with two MTE engines and a new fuselage.

Linden, Arthur W.↗

NASA NTRS1987

Recent progress in circulation control aerodynamics

A workshop on circulation control aerodynamics was held on February 19-21, 1986 at NASA Ames Research Center, Moffett Field, CA. The subjects covered were viscosity and turbulence of Coanda jets, circulation control airfoils, airfoil theory, circulation control airfoil and wing experiments, circulation control rotor theory, X-Wing technology, and fixed-wing technology. The unclassified papers of the Workshop are reviewed in this paper, and Workshop recommendations for future research and development on circulation control are presented.

Nielsen, Jack N.↗