1:2 tackle would be the easiest with a shock cord return, a drum would work well too, but be a slightly more complex and heavier install. Very neat and quick...love little ideas like that and Cicho did look pretty pleased with himself.That's really neat.
My guess: obviously, you're pulling a reverse tackle. But you don't want to just pull the sheet into a reverse tackle because it means you can't pull it out quickly.
Again, I'm guessing here. So, sheet comes down through hole in deck, through block (well call it block A) and is dead ended somewhere. A line comes off the block and goes into a reverse tackle. Shock cord comes off the block the other direction. The shock cord is strong enough to pull out the reverse tackle. The handle is attached to the other end of the reverse tackle.
When you pull the handle, you pull the reverse tackle, which moves block A far enough to get all the sheet through the deck hole. When you release the handle, the shock cord pulls the reverse tackle through and resets the system. Block A could just as well be a fairlead.
I don't have a scanner here, so I will have to see if I can draw what I mean with paint. Ug.
ETA. Doh. Didn't think drums.
Valid point, so drum likely. When the Interlodge did her control line installs it was a mix of some lines run low down in the centre of the boat (vang, outhaul, main cunno) the other control lines for the jib lead in/outs and up/downs were run along under the deck on the outboard sides. I know that Quantum, her sistership managed to get all the control lines down low towards the middle of the boat, nice work by DB. The spinnaker retrieval system was a very light 500mm carbon wheel attached on the Stbd side outboard of the Stbd primary and driven by the pedestal. I could see a similar undriven wheel, mounted as you say low down in the boat at the back end doing the same job. Now how are they driving it?Would a 1:2 tackle with a pull line shock cord retriever not leave 1.5m of dangling rope and also need a long system, say 0.5 to 0.75 boat length, with A-Sail sheets @ 2.5 x LOA? I bet the system is so neat and tidy it fits on the underside of the deck with 2 tabs or on the floor to keep CG lower. Nothing would be dangling around or out of place.
Looks like bungy/shockcord to me. Drum on a ratchet/freewheel, as the man says.Now how are they driving it?
Dammit MSA, stop being so bloody logical, I WANT photos!Gearing on the retracting pull cord.