Marine propellers are studied in design and off-design modes of operation like crashback. where the propeller rotates in reverse while the vehicle is in forward motion. Past experiments (Jessup et al. Proceedings of the 25th Symposium on Naval Hydrodynamics. https://www.bekindtopets.com/super-pick-Rx-Quadruple-Topical-Ointment-Quadritrop-for-Dogs-Cats-30-mL-super-grab/