ObjectivesThis paper explores the effects of air flow rate and sailing angle on the air layer retention and energy efficiency of the bottom groove of a ship. focusing on a large scale model of a bulk copyright. MethodsAn air layer drag reduction self-propelled model system and hull cavity scheme are designed. and drag reduction experiments are conducted under open water conditions. https://www.roneverhart.com/Cyspera-Pigment-Corrector-1-75oz-52ml/