mainsheet blocks , trimmers & mechanical advantage ?

:)

Looks like the mainsheet arrangements on a Sunfast 37 and two Sunfast 32i's I have sailed on. They were Glenans boats so I had assumed that they were "glenanisations". I did'nt realise they were so common :)

The other 4 boats among the 200+ around us all have the 6:1 / 24:1 lower diagram arrangement, as we now have. I'm not into racing, but like going up wind effectively if I can :)
 
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