Ducted-fan tail-sitter unmanned aerial vehicles (UAVs) provide versatility and unique benefits. attracting significant attention in various applications. This study focuses on developing a safe reinforcement learning method for back-transition control between level flight mode and hover mode for ducted-fan tail-sitter UAVs. Our method enables transition control with a minimal altitude... https://www.ashleyshomestores.shop/product-category/5-piece-sectional-with-chaise-and-audio-system/