The boat has been in the water for about 2.5 years. Needless to say, it needed a good cleaning. Also, the 3 blade prop we had Installed was way too much drag. we originally had a martec folding prop that was too small. Then we installed the 3 blade. I started looking for a replacement folder and found a 16d12p. I also sent it to Martec and had them overhaul it. We put it on and it runs great! We can still run max rated rpm and the boat will run at 7.3 knots! Our sailing performance is back to normal as well. Of course, scraping all the old gunk on the boat helped too!