mooring in Catalina Island for a month using my phone. The vidio didn't look bad at all. When I back down all hell brakes loose or at least it sounds that way. My cockpit scubbers are right in front and above of the area of the prop and it sucks air in a hard stop. That's not how I broke my sender however. It was just more usual vibration then the Ace Hardware bronze nipple could take. WHAT A MESS! It shot out oil right onto the alternator whichtossed it everywhere. Sorry I missed the rest of the thread.