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  1. geeviam

    Improved Cheese Grater

    I'll kick off this thread with what I've done so far, to make a modified cheese grater plate that will pickup enough water in the sea chest for proper live well circulation, and also fit flush with the running surface of the hull to improve high speed performance and stability. On the first attempt, I made new grater plate out of 3/8" thick Lexan which mounted flush with the bottom of the hull. A table saw was used to make angled cuts to match the angled shape of the sea chest opening. It took a lot of time and saw blade adjustments to get the cuts angled right, so that there are no gaps. It performed better than the factory grater plate. However, I drilled too many holes that were also too large, so some drag and turbulence was still there. Here is the second generation cheese grater. There are only four 5/32" angled holes in it to pick up water, but the water flow with or without the pump turned on is just fine. The holes are all along the right side of the sea chest, farthest from the keel and away from the prop. I did not get the same speed gains that others have claimed recently, with a modified grater plate. But, the all-around improvements in performance, handling, stability, fuel economy, prop slip, and even porpoising, are remarkable! No more white knuckles and constant ride/trim tweaking. It is like a new boat and very fun to drive! There's only one thing yet to fix... when the boat is pulled out of the water, the sea chest holds a little water on the side that has no holes in the cheese grater, because it's lower on the vee of the hull. One tiny drain hole on that side should do the trick.
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