[cdavisdb]

Just went out and measured, and I'm pretty sure I can get 4 inch riser extensions in without raising the engine box. that makes me very happy. Also got a chance to try straightening out the props. Boy, did I screw them up! Seems like I do something like this every time I buy a new boat.

Interesting info on props vs load. I will have to get a bunch of people on board and get some more data to see
how much relation there is with a duoprop.

Duoprops are different in unusual ways. Look at the props and they don't have all that much diameter, even though, with a total of 6 blades, there is a lot of blade surface to grip the water. What really grabs you is the pitch, its huge. They get away with this by turning them real slow. If you are towing behind the boat and look at the props, you can almost see them going around, compared to just a blurr with other drives. Very distinctive. The slow turning speed reduces cavitation and frictional losses, contributing to efficiency.

I've read several places that fuel injected engines were using very aggressive valve/cam timing/overlap (not exactly sure of the right terms). Bushwacker's comments about my vac results are consistent with that. It also makes the engine more susceptible to water intrusion via reverse reversion, a real nasty for me, with such a deep engine and since much of my diving is drifting with the divers, at idle where rr is worst, stern into the wind and wave. I like the idea of 4 inch extensions, very much.

Connor