THEORETICAL AND APPLIED MECHANICS

TEORIJSKA I PRIMENJENA MEHANIKA  2004 Vol.31 (3-4), pp.281-315

Summary: 

Ivan Kostić

Some practical issues in the computational design of
airfoils for the helicopter main rotor blades

Very important requirement for the helicopter rotor airfoils is zero, or nearly zero moment coefficient about the aerodynamic
center. Unlike the old technologies used for metal blades, modern production involving application of plastic composites has imposed the necessity of adding a flat tab extension to the blade trailing edge, thus changing the original airfoil shape. Using computer program TRANPRO, the author has developed and verified an algorithm for numerical analysis in this design stage, applied it on asymmetrical reflex camber airfoils, determined the influence of angular tab positioning on the moment coefficient value and redesigned some existing airfoils to include properly positioned tabs that satisfy very low moment coefficient requirement.