My experience is pretty limited but I haven't seen a roller furler set up below deck like this.
Am I seeing this right?
Am I seeing this right?
below deck furler, or under deck furlers. some boats have that setup. the idea is to get the foot of the sail as close to the deck as possible for better performance. the deck creates a fence fon the bottom of the sail so air does not spill onto the other side of the sail known as a deck sweeper. furler is in the anchor locker or a separate locker with a drain
Deck sweeper headsails give a significant performance benefit, not just due to maximizing sail area. .....The performance gain is likely much more than .1 knot!
As I am a light handed cruising boat doing long passages I have a high cut foot on my genoa so I can easily see under it. I would never have to go forward to see other boats. When I was on racing boats we always have crew on the bow at starts because you can't see a thing to leeward from the helm.
The performance difference between my high cut genoa and deck-sweeper must be substantial.
Thanks for the info, guys. I get it now why headsails attached to the deck surface can improve performance. Even with a jib pendant, I can't see very well. It might be worth getting some of those rollers to reduce wear on the headsail.Deck sweeper headsails give a significant performance benefit, not just due to maximizing sail area. There is also the "end plate" effect, ensuring flow along the bottom of the sail stays attached to the sail rather than spilling off the foot. Sometimes you can see the spillage happening when the sail is eased out in the form of a patch of ripples on the water below the sail. The performance gain is likely much more than .1 knot!
There are certainly downsides to deck sweepers. They do tend to get fouled on the stancheons when grinding to close hauled. On race boats the bow or mast man has to "skirt" the sail on tacks. That problem can be reduced by installing rollers on the lifelines at each stanchion. This helps the sail flip over the stancheon instead of hooking on it.
The other downside is the reduction in visibility. On a headsail with an elevated foot and higher clew you have some visibility to leeward under the sail.
I am not sure how much benefit a recessed furler is on a cruising Hunter. Cruising headsails tend to have a higher clew so they furl cleaner, so you won't be getting the end plate benefit, but you still have the aforementioned downsides, plus a great gaping hole in your deck letting water into your anchor locker. The only benefit you get is slightly more sail area.
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