Theoretical Investigation on Effect of Helicopter Main Rotor Parameters in Required Power

The main rotor is the principal factor effecting helicopter performance and fuel consumption. There are many basic geometric parameters that constitutive design. Radius chord among these parameters. In this study, it aimed to examine effects of variation in radius on required power at different flight conditions. Based design values B0105 S-76 from utility group, calculations were made for only when changed between +8% -8%, both 8%. These repeated hover, 50 knots, 90 130 knots forward flights, sea level, 5000 ft, 10000 ft altitudes. With chord, cases maximum reductions increases revealed. Results shows İncreasing alone resulted an increase all It has been observed combinations obtained by decrease amount according altitude, suspension condition velocity.