Itsabimmerthing

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About Itsabimmerthing

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  1. Itsabimmerthing

    Garmin AIS 600 software, anyone?

    Nice if Grizzly can help I have the file too somewhere... Have you guys updated the software somehow? My unit works perfectly, so no really no need for an update...?
  2. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Diagonals are slack so for sure the slack comes from somewhere. V's stay tight and three spreader mast is pretty well supported. Tension of the D's is the big question. I'd hope to find a system where we adjust forestay and maybe D1's acc. to TWS. To keep it simple to start with. So far it has been a single set up per season approach.
  3. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Thanks!
  4. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Can not adjust at the partners, sparcraft mast with non-adjustable collar. Mast butt is an option, but in that case the butt will be moved a lot, maybe 2-3cm to the next holes (P=16m) Next step will be: Record these settings, these will be our <15kts TWS settings, <10kts TWS will be same but forestay length +1cm For higher winds I think I try tightening the D1's and D2's half a turn, see what happens Thanks again for the comments, and to clarify I do not have a mast jack.
  5. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Sorry no pics, and I doubt it would be visible in a picture. And to be clear the mast sags in the middle to leeward ever so slightly.
  6. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Quest for the perfect mast tune continues. Shortened the forestay about 7mm, very small change but it helped a lot to get the excess sag out. Now tested with the racing main with Max roach and largest 106% jib Offshore, beating in choppy 1m waves. Mast does not pump. D1,2,3 clearly loose, too loose. Mast makes a slight, just noticeable bend to wind ward between first and second spreader. Speed & performance was good against our peers so I think this is their mast shape we want. We are probably at good tune for <15 kts, what to change for >15 kts tune? Tighten up all D's as suggested before?
  7. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    He will come, just want to do as much as possible on my own... Main backwinds pretty easily, added pre-bend helped on that from last season but maybe there could be less I think. The forestay is new, so there has been slight change in length. Read somewhere that main "speed bubble" could be result of too much headstay sag. Need to get back out for more testing... Numbers look good compared to ORC speed guide.
  8. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    New main, three years old heavy jib.
  9. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    That X-41 was for reference only, I do not have mast jack, Alumast... Something along those lines, will try one small adjustment at a time to find the best setting. North suggested trying the forestay first. How much forestay sag would you guys like to see on an 17m forestay. Now in approx 8 kts we get maybe 20cm deflection, with no B/S and in 15 kts 35-40cm with b/S just supporting. How about our tacking angle or really a gps track, 20 kts TWS, constantly 85 degrees tacks in a chop and steering to target speed minus 0,2kts due to waves. Is that good or should it be better?
  10. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    X-41 has a jack, that was just to get an idea of how much to start with. It is of course possible that the rig is a bit loose, but because it stays visually straight and boat performance looks and feels good, I think we are pretty close to optimal and do not want to make too drastic changes. Shortening forestay 10mm doesn't do much movement at the top, to change the CoE? Spreaders are swept back 22 degrees, so some of that 10mm "pull" should tighten the rig a bit.
  11. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Thanks. Will try to shorten forestay as a next step. That should tighten everything a bit. At 20kts we clearly had too much H/S sag and rudder angle was a bit more than I think is good. I think we might be at decent light/medium wind setting now? X-41 is 28mm on H/S from heavy to light. Thinking about trying what 10mm does on my boat.
  12. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Thanks for all the comments, gave all of them some thought when sailing today. Out sailing and training today, similar weather moderate seas and 20-25kts wind. Looked at the mast closely today and noticed that at least the forestay is too loose for 20+ kts. At 1/2 backstay there was still 30-40 cm sag (forestay lenght approx 17m). I changed the forestay for this season to 9,5mm rod with BSI bottlescrew with scale for easy adjustment. with 3/4 bacstay on, V1's stay always tight and the mast seems to stay in column. At 20 degrees heel the D1's start to become loose and at 25+ degrees they are visibly loose. Main looks good, no overbend wrinkles. Moderate seas and all tacks were around 85 degrees measured from GPS track and we were hitting our targets constantly up&downwind. I do not feel we are "way out of whack", rather pretty close. Next step we though of trying is to shorten the forestay 1-2cm. D1's are a ? as I do not want to pull back pre-bend or limit the bending just to the top of the mast.
  13. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    20kts, target heel 27°, awa 80. As per speed guide. Mast looks straight and V1's are tight, D1's taut. Just spoke with NS rigger. He said that common mistake is to have the diagonals too tight and what I explained sounded about right as long as the mast is straight. I'm liking the fact that we tacking 80-85° GPS track, not pinching and would like to keep it that way. Also the speeds are looking good. Thanks for the comments. I'll observe more today when we go out today.
  14. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Thanks. Rigging is (slightly oversized 12mm V1's for minimal stretch) dyform and discontinuous. AWS would be 26,3kts if in target. I like the pre-bend and bend with backstay on. Headstay sag is pretty good too. Would not like straighten or "lock in place" the mast too much with diagonals, as the boat seems to perform well, maybe she can do even better? Would hate to loose the mast... Yesterday reaching at 20 kts, heeled 25° was the same V1's tight, D1 feeling taut, but getting looser, D2/3 visibly completely loose ~2cm sideways play. Half backstay. Appreciate the input
  15. Itsabimmerthing

    Mast tune, fractional, 3 spreaders swept back?

    Thanks. Rigging is dyform. AWS would be 26,3kts if in target I like the pre-bend and bend with backstay on. Headstay sag is pretty good too. Would not like straighten or "lock in place" the mast too much with diagonals. Yesterday reaching at 20 kts, heeled 25° was the same V1's tight, D1 feeling taut, but getting looser, D2/3 visibly completely loose ~2cm sideways play. Half backstay. Appreciate the input