David, Check out the article "Rod Rigging -- Generic Tuning" by Greg Cutter in the Do It Yourself section of the C&C Photo Album and Resource Center. I'm going through the same process after re-stepping the mast on my 34+ this spring.
Monty Scandia 1991 C&C 34+ Annapolis, MD On Fri, Jul 31, 2015 at 11:59 AM, David Knecht via CnC-List < cnc-list@cnc-list.com> wrote: > I took a good look at my furler, mast, shrouds and stays yesterday > preparatory to trying to do some mast tuning. I am unsure as to the best > way of going about this process and could use some advice. > I found that I was raked somewhere between 18 and 24 inches aft, which is > much too far by all accounts, so I want to bring the mast back to 6-12 > inches. I have read the guides, but it is the specifics of different > mast/shroud/stay combinations is what I am unsure about. It was more > straightforward on my previous 34. My mast has no adjustment possible at > the base or through deck unlike my old one. As near as I can tell, it is > all done with shrouds and stays. The backstay is a split wire with a > pinching car that runs up and down to control backstay tension. The > backstay wires runs to two turnbuckles on the transom. The spreaders are > only slightly swept back but the rod shrouds run to a position just behind > the mast. One runs to the top of the mast and the other part way up, both > passing through the same point on the lower spreader. The top ones are > extremely tight, with no flex/sag on the leeward side when sailing upwind. > The lowers are a bit less tight but still no sag. There is a third rod, > which I am forgetting where it terminates on the mast, but presumably lower > down. Forestay is on a Harken furler. > So how to proceed (or wait for the Rendezvous and get all the great minds > together for a tuning session!) > 1. Should I disconnect the backstay before doing anything with the > shrouds? The car on the split stay can only go so high without running out > of wire, so even at its topmost position, it is putting some tension on the > backstay. I can tie another line to it and let it run up further but it > makes more sense to me to remove them altogether or loosen the turnbuckles > as much as possible. > 2. Presumably, I would then loosen all the shrouds and then tighten the > bolt on the furler to bring the mast forward, then recheck rake after > tightening the shrouds somewhat? > 3. After adjusting rake, how would the tension of the backstay be > adjusted? Presumably minimal tension with the car at its topmost position? > The tightness of those turnbuckles is going to affect the amount of > tension the adjuster is able to generate, so that would seem an important > adjustment, but I have not seen any guide to how to set that. > 4. When to check the rake? With the backstay loose/disconnected or in > its nominal highest position? > 5. One thought I have had is that before doing any of the above actions, I > should recheck the rake with the backstay removed just to see if it makes > any significant difference. I know they were removed to take the boat out > of the water last fall and again in the spring, so how the yard guys > re-tensioned them I have no idea and I have not further adjusted them. > Thanks- Dave > > Aries > 1990 C&C 34+ > New London, CT > > > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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