I have a 22' V-Sled with a 72 inch bottom (my boat not me :grin: ). I need to know how much zinc I need to put on before my Nehalem Bay / Buoy 10 trip. I did a search, and couldn't find any calculations, theories, or figures. I have 1 zinc on my trolling motor, and about 4 lbs on my transducer bracket. I know (guess) I need more. Any help?