Join Date: Feb 2000
Location: Annapolis, Md
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I had a 1949 wooden folkboat with jumper struts. They were important for controling headstay tension, masthead sag in a breeze. In effect they transfer the aftward force of the backstay to the forestay and eliminate the need for swept back spreaders or for running backstays on early fractional riggers. The are mostly out of the way except that jumper shrouds can hit the leech of the chute when close reaching.
I found that they were pretty much a set them once and leave them affair. You typically wanted just enough tension that the mast was straight vertically and side to side with minimal backstay tension. They bascally proportionately self tension as backstay tension increases.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay