I just bought a 17 1/2' Sea Nymph with a 115 Evinrude. It is semi-shallow vee. I want to make a "rocking chair" anchor for it but I am curious as to the weight. Can someone give me an idea. I will be fishing in moderate wind and very little, if any, current. I have been told everything from a #5 to a #45 anchor! Please help, I am a nooby!