8:1 and 20:1 Cascaded Boom Vang
8:1 Cascade Vang System
Cheaper than using two fiddle blocks, lighter, and stronger. What is not to like? You just run the control line back to the cockpit where you put a cam cleat. You will likely need a turning block on deck but then you have the vang where you want it when it needs to be released quickly before you round up.
20:1 Cascade Vang System on Papoose
The vang system on Papoose is arranged to give even vang tension with boom position even though the primary padeye is aft of the pivot point of the boom. Before I did this system, the vang tension would increase by itself as the boom was let out. This was caused by the geometry of the layout with the pivot point of the boom forward of the padeye that was as far forward as it would go and still be on the cabin top. The solution is shown where there are two stand up blocks on the cabin top that are forward of the boom pivot point. The net is that the forward blocks exactly compensate for the aft padeye location so that there is no increase in vang tension as the boom is let out. The red line starts at one of the beckets of the two blocks on the boom, goes through these one of the stand up blocks, thought the first boom mounted single block, through the second stand up block, through the second boom mounted block, and terminates at a 4:1 pair of fiddle blocks. The red line system has 5 parts so the total purchase is 4 times 5 or 20:1.
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