If the mast tip is off center with no tension on the standing rigging then there is problem with the partners (the place where it penetrates the deck) or a problem with the foot. The extruded piece of aluminum we call the mast should stand nearly perfectly straight and centered with no outside forces. Trying to force it centered with the standing rigging is not the right answer.
I experience considerably better performance on port tack than on stbd tack. When the rigging was rebuilt on my boat the rigging shop sent back symmetrical length side stays. When the yard was installing them they had a very difficult time getting the threads to engage on the stbd side. This suggests to me that the tip of the mast is leaning off towards the port side requiring the stays to be longer on the stbd side. To me this also answers why the port tack is better. The mast IS centered in the partners. I believe the only best way for me to fix this condition is to move the foot of the mast to port. The mast will pivot at the partners and pull the tip to the stbd side. This is an easy fix when pulling or setting the mast but once the rigging is installed it makes shifting the shoe much more difficult. I picture releasing the tension on the rig and then using a hammer to tap the shoe over. It may even be as insignificant as 1/4 inch. At that level of effort this is definitely being left on the back burner. When the opportunity presents I'll take the time to fix it. If I was racing it would be a different story since port tacks are less favored. If one has to be better than the other then make it the stbd tack. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Tue, Aug 20, 2019, 9:54 AM Shawn Wright via CnC-List < cnc-list@cnc-list.com> wrote: > What are the symptoms of an uncentered mast? I have noticed that I > regularly see slower speeds on one tack (I need to pay more attention to > confirm which tack) even after trying to tune the sails well, and under > regular wind/current conditions. I don't have a knot meter, and only use > Navionics for GPS speed, but it has happened often enough that it makes me > wonder... > -- > Shawn Wright > shawngwri...@gmail.com > S/V Callisto, 1974 C&C 35 > https://www.facebook.com/SVCallisto > > > On Fri, Aug 9, 2019 at 4:33 AM David Knecht via CnC-List < > cnc-list@cnc-list.com> wrote: > >> I recently did some more mast tuning with my new/old Loos gauge and have >> one addition to all the guides I read that I think worked very well. The >> question is how to tell when the mast tip is centered side to side. In >> most guides you use the main halyard and measure the point where it touches >> some reference point on either side. I found this difficult to reproduce >> on the two sides. At the suggestion of a local sailor at my club, I got an >> inexpensive hanging scale ( >> https://www.amazon.com/gp/product/B00ZWNGZFO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) >> and looped the hook through my halyard shackle and used that to determine >> when the mast was centered. I would pull it down until it touched the >> chainplate and note the weight and then repeat to the same point on the >> othe side. It worked very well (and I was off a bit). Dave >> >> S/V Aries >> 1990 C&C 34+ >> New London, CT >> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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