We are now the proud owners of Tarna, an Alden Challenger. She has a Westerbeke W44B engine and a three bladed prop. I would like to change her over to a two bladed prop. I can't afford a feathering prop at the moment so the best alternative is a two bladed fixed prop. Has anyone had experience with two bladed props on Challengers? I want to get the best performance both for sailing and motoring possible under the circumstances. Thanks