The combination of Halls gull wing composite boom and Harkens Switch T track which reduces the height of the mainsail cars, makes for a very clean look on the Shipman 65.
The Switch T Track looks like a railway switching system. The battcars alternate fall down the portside then the starboard side helping the sail flake itself and lower stack height.
For a review of other mainsail furling and flaking systems follow this link.
And here's a closeup from Harken of their switch T Track system
Switch T Track system for reducing stack height on large yachts. Battcars make mainsail handling much easier especially with full-length battens.
When a full length battened main coupled with Battcars is lowered the sail flakes on alternate sides of the boom. This makes for a very neatly flakes mainsail. The problem however is the combined height of all the cars stacked one on top of the other. With the switch t track system cars are alternately pushed to one side of the boom or the other to lower the stack height.
Additional Resources
Harken battcar switch track brochure
Hmmm, maybe I shouldn't have got that roller furling boom after all.
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