Join Date: Jun 2001
Location: Wilson, NY
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I purchased a CDI plastic prop for my Atomic 4 and have been VERY happy with it for 4 or 5 seasons. My top end increased by .5 knot or more and I can start and stop faster as it seems to dig in better. It now has a couple of nicks in it, but seems to be holding up just fine. I would buy another rather than switch back to my old bronze prop.
One concern has to be the strength of the prop. CDI claims if you hit the plastic blade hard enough to break it, the blow would bend a bronze prop putting it out of balance. CDI claims that their prop will work better with one blade than a bent bronze prop. I bought that explanation - besides, if you hit bottom w/a sailboat prop, you usually have other worries, like where did your keel go.
Regarding the use of your bronze prop: Assuming you bought your boat used, I am wondering if your spare bronze prop came with the boat, in which case I would guess the old owner replaced w/plastic and was happy with that move or he would have put the bronze back on. If the prop is not from your boat, you do need to look into it''s suitability. The wrong prop can really have a negative effect on your performance and I would be concerned it could lead to overtaxing your engine causing overheating and other problems.