Yes. I installed those on my boat. The main advantage is that you can adjust the car location while the sail is under load. This allows you to instantly see how it affects the boat.
Those are good ways, there is a system that is a lot less expensive see pic. This system the most adjustable as I can use barber hauler to the rail for reaching. Total cost was less than $200 for both sides and less than 2 lbs.
I have seen something similar to this on an expensive race boat.
I cannot tell exactly how it works but it looks like the sheet goes through a block that you control up and down and in and out so that you control the clew height and distance from centerline, effectively the same as moving the car forward and backwards. Right?
Well yes, I can go side to side and up(car back) and down (car forward). It is a 2:1 from the car to the lead and a 3:1 for the purchase. I should have used 2:1 instead. you can just barely see the front purchase block in this pic below.
Well the problem is the width of the recess in the deck. Harken will not fit in the recess, the car are if memory serves me well, .135 to wide to in the recess. This due to the required room with the car for the recirculating balls in the car.
Btw the sliding part does no longer have ball bearings but low friction padding contrary to what's out there on the inter web...... must have been a design change after (I assume) too many folks lost the (their) bearing during install...
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