For single-rotor helicopters there are special flight modes. when tail rotor (TR) is under significant inductive influence of vortical wake of main rotor (MR). Inductive influence of vortical wake of MR can provoke essential changes in flowing of TR and its aerodynamic characteristics comparing to isolated rotor. In this case increase of tail rotor pitch. https://www.bekindtopets.com/flash-price-AniPsyll-Digestive-Aid-for-Horses-save-more/