Ever wonder what your propeller is doing underwater? #outboards #outboardmotors #dinghy #sailor

During an electric outboard test, Editor Theo Stocker took this swirly video. The bubbles coming off the tips and forming a spiral are called cavitation. The pressure difference at the tip of the propeller is making the water boil. The pressure difference causes the water to heat up by lowering its boiling point. Whereas aeration causes the whirlpool effect. Theo filmed this on a camera at 50 frames per second. So, it looks like the propeller is going backwards. But this is an illusion. The frame rate and rpm are interacting, so the fins are not going backwards or stopping. ---- Subscribe to Yachting Monthly's Youtube channel at: https://www.youtube.com/user/YachtingMonthly/videos Subscribe to the magazine at: https://www.yachtingmonthly.com/subscriptions/yachting-monthly-subscriptions Read more sailing articles at: https://www.yachtingmonthly.com/ Like our Facebook page at: https://www.facebook.com/yachtingmonthlymag/ Follow us on Twitter at: https://twitter.com/yachtingmonthly Follow us on Instagram at: https://www.instagram.com/yachtingmonthlymag/