Vincent DePillis

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About Vincent DePillis

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  1. Vincent DePillis

    Protecting net Spectra Lashings from UV

    Samson sales rep says UV has not been a problem. (thx) Yale engineering support says Maxijacket does have UV protective characteristics-- lasts about 2 years, and that once the pigment starts to go, the UV protection is going. DSM (manufacturer) has a graph on the web site purporting to show that Dyneema is better than Polyester in terms of UV resistance. References a specific testing protocol. Will get some of the maxijacket Pro and play around with it. Painting the lashings in place would be messy. In any case, will try to replace critical lashings more regularly. And will look for black lashing cord.
  2. Am replacing lashings on nets of Corsair 31R. I use discrete lashings for each grommet, and 8 strands of 2.2mm Samson spectra lashing twine ( I double a length of spectra, knot the end, make two passes, and then secure with half hitches). In looking at the Sunrise nets web site, with a view towards replacing my nets, I notice that they have a graph of UV life of various net materials that show untinted spectra netting dropping precipitously in strength over three years. This is said to based on actual testing by Sunrise. Not working for me to insert the link, but I would be curious what you all think. Makes me think that I need to be much more conservative about replacing lashings than I have been, especially when I am using such small twine. I also wonder what kind of UV protective goop or tape I could use. I use spinlock RP 25 on halyards and sheets to protect from wear, but I don't think it has any UV protection function. Maybe black self amalgamating tape?
  3. Vincent DePillis

    Integrating carbon in glass structures

    Thx for specifics on the stringers. How far apart did you place them? I will try and upload a pic later today.
  4. Am replacing slider hatch and seahood on my Corsair F31with a low profile fixed blister. (better visibility, lighter, better line routing from mast base lines to the winches.) Blister is carbon foam prefab piece to be bonded in place after removing the existing hatch surround. My concern is that bonding the stiff carbon piece into the soft glass deck will create hard spots that will eventually crack. My plan to mitigate the risk is to spread the load all the way to the cabin top edges. I would remove all the gel coat on the aft part of the cabin top and laminate over with carbon, stepping down the laminate and fathering carefully as I approach the edge of the cabin top. I would reinforce the underside of the cabin top as well (currently thinking stringers, because antigrav lamination is a PITA). I am also planning to reinforce the (really flexy) cockpit sole, with some carbon foam stringers. In this case I plan on landing the ends of the stringers on structural bulkheads with some wide (100mm) taping. Interested in advice in general on how to stiffen a boat locally using carbon without creating downstream problems.
  5. Vincent DePillis

    Coolboats to admire

    Have often though this. Seems like boats in the days before reliable motors used bowsprits and boomkins to spread as much sail as possible. I am thinking about a way to increase light air capability on my F31R (mast head cable less jib top) for exactly this reason. If I could put a mizzen on, I would. I thought about lengthening the mast, but chickened out. I am going to increase the size of the mainsail head tho. sorry, drifted there for a minute.
  6. Vincent DePillis

    How big a square top?

    What boat?
  7. Vincent DePillis

    How big a square top?

    Yeah that is the thought. just today I did a rough measurement of the mainsail head on a brand new Corsair 970 sport: 67”! i suspect that the main hull, mast location, and daggerboard location are v similar to f31. Hope to sail on the boat tomorrow. Should be interesting.
  8. Vincent DePillis

    How big a square top?

    Thx sidecar, that looks super useful. Will review in detail. Helm balance is nice in existing set up. I have the farrier marine deep F 32 rudder. So plenty of rudder to work with.
  9. Vincent DePillis

    How big a square top?

    Thx gnome. Any of your friends sailing f9/f31s? Would love to know their thoughts on mainsail plans. Looking for pix too. There are a couple of things I am wondering about – one is whether a big square top would increase the tendency of the boat to sail bow up. The F31s are a bit short on float buoyancy in the aft part of the float. I put on new larger floats but most of the volume is in the front of the float, increasing the bow up attitude when the wind increases. This is potentially helpful from a safety standpoint downwind, but increases transom drag upwind. ( I have been contemplating an setting up the mast dead vertical, eliminating the existing rake, as an experiment to see whether this would lessen the tendency to sail bow up.)
  10. Vincent DePillis

    How big a square top?

    Martin, I agree, stock main controls are undersized. My mainsheet is a custom Harken 12:1 ratchet fiddle block which I lead to a winch in heavy air, and I changed out the traveler for a Harken big boat traveler with 6:1 end controls. Not concerned about controlling the main. The mast is another issue. The F31r Omohundro mast section is a little undersized , and the unsupported top mast bends more than I would like. I do wonder if a 40% head will add a lot of stress to the mast . I could add shrouds to the mast head, at the cost of increased windage.
  11. Vincent DePillis

    How big a square top?

    Side car, those are exactly the questions I am mulling.
  12. Vincent DePillis

    How big a square top?

    That was a boat from south Africa, right? on race to Saint Helena or some such? Got a name for me?
  13. Vincent DePillis

    How big a square top?

    Man. Looks flat. And interesting to see close together shallow battens.
  14. Vincent DePillis

    Coolboats to admire

    Confession: I love this boat so much, I want to add a mizzen to my F31.
  15. Vincent DePillis

    How big a square top?

    Seems like batten angle, batten stiffness, and sail depth would affect twistability too. Shallow stiff battens, with flat sail is twister?