Present paper studies the variation of the blade spindle torque in a controllable pitch propeller (CPP) during the feathering maneuver. which is one of the rare but most challenging propeller maneuvers in CPP operation. The knowledge of the spindle torque under different operating conditions is one of the key features for the CPP controller unit design. The aim of this study is determ... https://vacuumdoctores.shop/product-category/obsolete-parts-with-alternative-or-secondhand-available/