Appreciate the response on Flex-O-Fold props for a 450 or 460. The price of the 3 blade Flex-O-Fold for a 460 is about $1600. The Max Prop is $2700. The Martec AutoProp (Stainless Steel) is the same as the Flex-O-Fold. My concern is stopping the 460 quickly at speed and reverse power. I currently have a 2 blade racing Flex-O-Fold on my Express 35. Its a great prop but is ineffective at stopping the boat because the blades won't open in reverse if the forward speed is more than a few knots. I did meet the designer who explained that the racing prop blades fit closely together over the axis of the drive shaft providing relativly low force to open the blades against the pressure of the water trying to keep them closed. The 2 and 3 blade Flex-O-Fold cruising props move the pivot point 1.5-2 inches off axis thus providing a great amount of centrifigal force to open the blades. The blade design has more pitch near the hub and less near the tips to eliminate cavitation as compared to the relatively flat blades used on Max Prop, J Prop and Autoprop. He admitted that those designs are equally good in forward or reverse but claims his design is far mor efficient in forward and nearly as good in reverse. He claims he can stop his 47 foot 20 ton sailboat in 2-3 lengths at 8 knots. Very impressive if true. I am still trying to find someone using the 3 blade Flex-O Fold before I buy. He gave me a reference which I will check out and report. The big negative of this prop is that the pitch is not adjustable. You have to get it right the first time. They will exchange it if it is wrong provided you just try it one time, but this is very time consuming and expensive for multiple haul outs to change props. The Auto Prop and J Prop can be adjusted underwater. Max Prop is adjustable but requires disassembly. They also have an edjustable version but it is VERY expensive.