I'm looking at a boat that has an outboard well. I wonder how badly it will affect performance. The boat is long and slender, low freeboard, not much windage, about 5000 lbs. displacement.
I suspect the lower unit and prop will create a lot of drag. Would a folding prop make much difference? Is there such a thing for outboard motors? Would a two bladed prop make a difference?
Without a fairing plug, will the aperture create a lot of turbulence? How do you make a fairing plug?
The boat comes with a 6 HP 4-stroke. It seems like a lot of engine for this boat on the lake where I sail. I could sell it and go with a Torqueedo. The Travel 503/1003 is rated for day sailers up to 3,000 lbs., but I think it could handle this boat on our lake. The boat has a solar panel on the lazarette which could help power it.
I have a Honda 2 HP long shaft that is more than adequate for my J22. It would probably push this boat OK, but not create as much drag.
Any ideas or suggestions?
All well setups I've seen allow the prop to retract out of the water and have some sort of bomb bay door arrangement to seal the aperture, otherwise there's not much point. With the prop up and door closed, the drag should be much less than normal prop setups. With no door though it would likely be considerably worse.
Mine was on a pivoting bracket. The bomb bay door was fabbed from GRP to the size of the aperture. A lip should be molded around the top of the door to make it impossible for the door to invert (ask me how I know this) .One side was attached to the hull bottom with hinges. On the other side was a catch to lock it in place. A line can be attached to lift the door. You can do it by hand, but may require some gymnastics.
a 6 HP 4 stroke should be fine, but at 5000 lbs, probably nearing the limit unless you are always powering in flat water and little wind. Torqueedo is OK, but limited range - maybe an hour at hull speed. Range increases a fair amount if you were to accept motoring at 2 knots. They consume a lot of juice. The solar panel may help recharging at the dock, but will do little to increase range.