I'm considering putting a Martec folding prop on my Yanmar diesel powered C&C 34. My question is how much power will I lose in reverse and what are other downside considerations? The reason I'm considering a Martec rather than a feathering prop is price. Martecs are available used for about $250+ and Martec will rebuild them/tune them inexpensively. Also, anyone know the prop shaft diameter for this boat? Thanks.