Renegade-27

Members
  • Content Count

    35
  • Joined

  • Last visited

Community Reputation

6 Neutral

About Renegade-27

  • Rank
    Newbie

Profile Information

  • Location
    New Hampshire USA
  • Interests
    Sailing, Science, Economics

Recent Profile Visitors

620 profile views
  1. Renegade-27

    Rudders and roundup

    Hey everybody - I love the general physics of sailing discussion, but really appreciate the specific comments. I also like seeing the pic of my "Sugar Mountain" (you can't be 20..). I do love her, while she steps on her foot dancing once in a while, serves as a fantastic hotel and swim platform.
  2. Renegade-27

    Rudders and roundup

    Already in progress
  3. Renegade-27

    Rudders and roundup

    The roller furler is actually very high which gives cruisers better visibility (I am told ). Jib could be in better shape - although I can flatten it out, the leach is starting to develop a permanent curl. Foot is pretty tight with the block in an aft posion.
  4. Renegade-27

    Rudders and roundup

    20-30 degrees as measured from my rudder position sensor part of the autopilot. You can see relatively new sails - with the original sails it was virtually impossible to sail upwind at all.
  5. Renegade-27

    Rudders and roundup

    This should help understand the position of the rudder - along with my computer measurements to see how much deeper the other rudder is! The rudder is right at the waterline. The hull aft of the rudder is almost board flat.
  6. Renegade-27

    Rudders and roundup

    Yes, but not fractional rig nor lifting keel. JSO35 Full Keel.docx
  7. Renegade-27

    Rudders and roundup

    The unbalanced waterline would, I believe, create forces that push the boat to leeward. Longer waterline on the low side - Bernoulli's principles - would create a vacuum there relative to the high side. Whether that imbalance would create a net force toward the stern or bow resulting in a turning moment would be important and dependent on the two waterline shapes (?). First principles.
  8. Renegade-27

    Rudders and roundup

    This is it - not my hull, but I think the pic is pretty telling... But here's me
  9. Renegade-27

    Rudders and roundup

    This becomes incredibly more complicated if you are trying to understand the dynamic effect - like the forces and center of effort changes when hit with a gust.
  10. Renegade-27

    J97 and PHRF

    I'm considering moving to a J97 from a larger cruising boat. Singlehanding and overall reduction in sail handling compared to a 35 footer is the objective. How does the J97 do under PHRF? I would be sailing with an older, cruising fleet scratch boat by at least 40 sec/mi, but there are also a ton of J80s around to race with. Thanks in sharing your experience!
  11. Renegade-27

    Rudders and roundup

    Wind changes are prominent with my lake sailing, but when the wind is up we don't see 20 degree wind shifts often. It's the light winds that shift around that much puff to puff.
  12. Renegade-27

    Rudders and roundup

    Wow - really great dialog. Thanks all so much. I'm learning quite a bit! I generally sail at 10+ with the traveller full down and a good healthy bubble in the luff. Main out/ carrying a bubble doesn't seem to help much. Maybe the highly loaded leach? I really don't understand why! As does (doesn't?) the first single reef seem to make a dramatic difference. I definitely agree about one-design. When I was ~20 (~40!) years ago I was globally competitive crewing on Solings. Did a summer foredeck crew for Peter Isler at the Olympic Sailing Clinic. I learned SO much - was a much better sailor then. Still, singlehanded sailing for me now is to put the boat in autopilot and continuously experimenting with the sails - as said, "mm adjustments". Usually trying to measure differences with instruments since I don't have a sparring boat, but yes, I also am, however, always looking to "sneak though some chink in the handicap rating system" The comments on the asymmetric waterline while healing also intrigues me. I sail in very variable wind surrounded by mountains. The dynamics of a gust laying the boat over further causing rotation to weather requiring significant helm plays out all the time. In steady winds I can often get control of the boat, but the gusts are often present and associated with roundups.
  13. Renegade-27

    Rudders and roundup

    Thanks again everyone. Learned quite a bit. Even got to tolerate insults by someone hiding behind big technical words and without actually offering any suggestions. This MIT PhD in Mechanical Engineering : Fluid Mechanics and Heat Transfer (really) with 55 years of competitive sailing has learned that usually its the smallest people who like to throw around the biggest words. Some comments, like feather to weather, are great, but miss the point that the rudder is going useless. When I can sit on the edge and feather its great - a gust can cause me to lose that edge. I really appreciate the perspective about overall balance and what is needed is to stop the weather helm. Heel and sailplan. Balance the boat. I'm usually singlehanded so weight on the rail isn't much of an option, but I'm going to dramatically reduce main (reef at 10-12; 2 x reef at 13-14 true). I can't shorten my forestay easily (fixed length) but the next step would be to have the yard shorten it. Lastly if that still proves a problem, the 'Fence" seem interesting. I bet I am lifting rudder out of the water and ventilating. Just read a technical paper on ventilation in foils and I think that could well be what's happening when all else is unbalanced forcing a 20+ degree helm.
  14. Renegade-27

    Rudders and roundup

    Yes, wide-ass boat. It occurred to me that the rudder might be lifting out, but I don't see how that would be geometrically possible. It's 20-30 degrees rudder - - Maybe not yet at 15 kts apparent, but really fighting at 20. OK - couple of good suggestions - couple of reminders of fundamentals. I will be working on the discipline to use "dramatic' sail reduction (double reef) at 12-13 and seeing how that goes. I understand to stick with the boat/boat builder if I change rudders. I can buy a replacement rudder for the standard draft (6') version. I'm not very worried about the rudder being deeper than the keel where I am - and I'd keep the other rudder in case the next owner wanted it. Any thoughts if an extra 9" - 12" will make a big difference?? (i know....i know ;) )
  15. Renegade-27

    Rudders and roundup

    Jeanneau Sun Odyssey 35. New(ish) sails with very good shape. Experienced sailor. Some rake back, adjustable backstay, bocks back for flat jib, leaches twisted off, traveler down, weight out of the bow, all of that. Rudder goes over hard - at 30 degrees nearly always stalls - I try to keep it at 20 +/- but the boat often just flips through the wind. I *do* try to carry too much sail but this is a poor sailing characteristic. I'd love to find a rudder from a full-draft JSO35, but they were imported from France at the time and almost all were spec boats with shoal draft. I can buy one from the factory and have it brought over. Seems like lots of places to get rudders made, but I'm also wondering how much difference 6-9" would make as well.