Steve Clark

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About Steve Clark

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    Super Anarchist

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  • Location
    Where the water is thin.
  • Interests
    Human folly.

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  1. Steve Clark

    I.C. Down wind question

    Yes. We typically build ICs with slightly oversized square cornered trunks. We build filler blocks that match the board we are using. This way we can change boards or move the board without having to commit major surgery. Development class and all that. It was also typical for people to have a pivot pin so you could sweep the board a bit, as if it was a pivoting centerboard, for in race tuning. This also had the advantage of being a bit nicer on thinks if you hit bottom. We sometimes have rocks in the vicinity. SHC
  2. Steve Clark

    What is this dinghy?

    A plastic knock off of one of these. Which as I understand it were perfectly fine dinghies. The rig isn't authentic, but that shouldn't matter much. Find a closet pole or equivalent for a boom and go sailing. SHC
  3. Steve Clark

    I.C. Down wind question

    White hull is USA177. Epoxy Glass balsa hull built by me at Composite Engineering. In the first generation of wicked stiff canoes. Finished by Del Olsen in 1984. Same vintage as Greymatter (World Champion 1084, 1990 ,2002) so an entirely credible Nethercot for the one design division. May need a new mast. Will need new sails and maybe a new daggerboard to be killer. The Wood boat may have been built by any number of people. It is most likely from the early 80s. Hard to say. Parts seem to look like I had some influence, I was the one who first put round heel holes in a sliding seat, so that bit was built after 1978. There are other clues. So it was probably built by Erich, or Fran in California or in Calgary by the Martin Herbert mob. In any event, high quality toys capable of getting sea water well into your sinus cavities. SHC
  4. Steve Clark

    Team NYYC

    The large benefit to end plating the sail to the deck is that if the sail is sealed to the deck, the center of effort moves lower when you twist the sail. If there is cross flow, there is less effect. On catamarans, you can have different pressure on either side ( windward /leeward) of the trampoline. The leeward side pulling up and the Windward side pulling down. A centerline spine as the AC 50 has can prevent these forces from mixing, resulting in more righting moment. I don’t know if the AC 72 can create a similar effect, but the hull is far enough from the leeward foil to make aerodynamic down force a player in the righting moment sweepstakes. Oh, and flying bow down helps too. SHC
  5. Are there actual holes? “Print through” is caused by the laminating resin shrinlarge. Blown up, you can imagine that there are pools of resin in between the wet out stands of fiberglass. The straight resin shrinks more than the glass/resin, so there are little craters that match the texture of the cloth. It looks kind of like a golf ball. The usual way builders avoid this is by laminating a non woven ( or chop strand mat) before laminating the cloth. On light boats, it’s hard to justify the weight of the chop strand mat. The solution is to wet sand and re coat as necessary. If there are actual holes..... it is common for laminates built without gel coat to exhibit pin holes in between the fabric’s yarns. The only choice is to repeatedly squeegee resin into the holes and sand until the6 no longer show up. There are tricks, but generally you have to fill and sand and fill and sand until the pin holes are filled. The worst possibility is dry laminate, in which case there was air entrapped in the weave. These can pop, and you have to fill and sand and fill and sand. You need to be sure water isn’t entrapped. SHC
  6. Steve Clark

    Craigslist Finds

    Actually, if anyone has a nice Bruner Finn Mast, I might want it. SHC
  7. Steve Clark

    So, I bought a boat

    Meadow Larks are one of the great sleeper designs. The uneducated respond as the first dozen or so responses you received on this thread. You should read “Sensible Cruising Designs” by the man himself. LFH designed boats for very specific reasons, and you have to respect the limits to get them to perform as well as they should. Keep her simple and clean, use the diesel to go upwind, and always have a place to anchor. The only area where you can probably do much better is in the cross section shaping of the leeboards. Something which is true of almost every centerboard and rudder of all traditional boats. SHC
  8. Steve Clark

    Team NYYC

    They charged $ 3 *10^6 so they had to be doing a fuck load of something. Kiwis are famous for getting better value for their dollar, so it would have cost everyone else more. SHC
  9. Steve Clark

    Dylan's New Boat Anarchy

    AIS is pretty universal, at least as far as I have seen, certainly all of the big things! All vessels with AIS show up on my screen. So what I don’t see in the fog are things not on the chart and vessels without AIS; icebergs, floating containers, marine mammals. I guess I am taking chances, but I am comfortable. It takes a fuck load less talent than when I was a kid. You had to find your way around with a stop watch, a compass, and buggerallelse. SHC
  10. Are you using the Chesapeake Log Canoe definition of the main? That is calling the mizzen the main as if it was a schooner. When Van and David were programming Red Herring my father thought that since the boat was easily driven to 8-9 knots under power (burning about a 1 gallon/hour) that he would simply fire up the diesel if he wasn’t sailing about that fast. So there really wasn’t much thought given to light/moderate air sailing. The rig was even smaller. Dad admired another L.Francis design, Marco Polo and always thought that the performance under power was an important aspect of auxiliary cruising Yacht design. He liked to get places without fucking around. I perceived the experiment a little differently. I was focused on developing the sailing performance of the design, and that has been where all my effort has gone. I still share Van’s enthusiasm for motor sailing, and if there is any wind at all, it is worth about 2 knots and 500 rpm to haul up the main and mizzen. That being said, I wanted to see if I could attain the fairly lofty and romantic sailing performance he imagined, and all effort has been spent making the sailing part as efficient as it can be with little care for ease of use. My aversion to roller furling is windage when the boat is on the mooring. It can easily blow highway speeds for a f ew hours, and the boat is happier and easier on her ground tackle with minimum windage. I use hanks, so dropping the jib on deck is alway under control. If sailing several days in short succession, the sausage bag can be zipped over the sail stopped in the waterways. All told, I guess I think that performance under sail is the most important criterion of a cruising sailboat. You have to be able to sail well in all conditions and I am loath to surrender any sailing performance for ease of use or convenience. Things have to be practical, efficient and achievable by one man, but I’m not going to give away half a knot and 3 degrees of heading without a damn good reason. The original masts were very heavy, as were the sails that we tried to hoist on them. It was a total 30 minute shit fight to get the main up. She had a bolt rope and slot because this was before batt cars and all that. There weren’t many full battened mainsails in 1980, so no one had invented that stuff yet. I still use the bolt rope because the sail isn’t that big. The carbon rig weighs about 300 pounds less than the aluminum, with the consequent improvement in righting moment. It should also be noted that rotating rigs with narrow should bases are very rare. This is for the good reason that compression and rotation are not best friends and it’s a challenge to stabilize a rotating mast in buckling, so while I can bristle with innovation with the best of them, I decided to replace the heavy aluminum rotators with the lightest non rotating carbon masts I could get built; book the certifiable righting moment gain and surrender the more speculative aerodynamic improvement. The result was that I could increase sail area about 300 ft^2 with a 100% jib and maintain a “first reef” threshold of 20 knots apparent? If you aren’t going to freestand the mast, you have to have enough beam to make the shrouds worthwhile, which means either increasing flare in the bow or moving the rig aft. If you are referring to the large separation between the main and mizzen, there is a complex relationship which more or less comes down to the further apart you put them the harder the mizzen can work. In effect you want the wake of the main to fall to leeward of the mizzen. There is CFD available today to study this that wasn’t available in 1979, and I haven’t done much investigation. It IS very nice not to have sails overhead in the cockpit. I& I could stand it, a bimini would could be easily fit, but I am my fathers son! He never had cockpit cushions, and neither do I. i hope that answers your questions. And my wife used to sail with me and our kids. She also knew that Red Herring was her only choice because of the emotional attachment I have to the boat. So she made it work. At 64 with two bad hips she wasn’t having it. I hope that now the hips are replaced, she might reconsider. SHC
  11. Red Herring started life as a cat ketch with over rotating masts. It didn’t work very well for a number of reasons, but really needed more sail area. I moved the main aft 30” and added jibs along with changing almost everything else. Certainly the mizzen doesn’t help a lot beating in normal weather. They do help keep the bow up once you start reefing and the center of effort of the main and jib moves forward. Job and jigger is a very pleasant sail combination. I don’t believe in roller furling, so if i’m sailing solo or don’t feel like working, she sails well with just the main and mizzen. Doesn’t point quite as well, but being able to tack without touching a rope is pretty sweet. Once you know what you can do with a mizzen, instead of the rudder, they are lots of fun. And that is the whole point. SHC
  12. It’s not that easy. The inherent problem is that the foils you want to go 60 are so draggy at low speed that you can’t get to the high speed. I racing sailboat design, the game isn’t usually played for top end speed, but for improvements at the lower end of the speed range. Falling off the foils in marginal conditions is far more disastrous than being a quarter knot slower a full chat. Sail Rocket simplified the problem by restricting the wind speeds they sailed in, so they had enough wellie to just bulldoze some of the speed bumps. None of the AC designs have tis luxury. So getting the blend right is going to be a huge challenge. SHC
  13. Steve Clark

    Dylan's New Boat Anarchy

    Dylan. First time long time as we say in the States. Without an oven, you can’t warm up the coffee cake, and life is less pleasant. I agree about radar because I think AIS and the chart plotter with the boat as curser does more than radar ever did. I would move it out of your line of sight, but I wouldn’t throw it away. It’s free for heaven sakes. Maybe it’s my old age, but I like having more screen area than a phone. SHC
  14. I have talked to Paul quite a bit about the Sail Rocket adventure. When you try to get to the nitty gritty, he gets kind of vague, I think because while he is very good technically, he doesn’t really have the detail expertise of the designers. Paul builds it and figures out how to manage and sail it. He reports back to Malcolm Beardsley what he learns amid they collaboratively refine the machine and each iteration. Paul’s description of the design philosophy wears pretty simple: we designed a wing that could drag a foil ( capable of generating enough side force to resist side force of the wing) at 60 knots. You can calculate the lift to drag ratio of the wing and the lift to drag ratio of the hydrofoil and get a first order approximation of what is required. But there are many tiger pits and walls in between that first assessment and the goal. Paul is the dedicated, talented guy to hammer away at those problems for 10 years and get it done. He isn’t necessarily the guy who can tell you the exact cause and effect of every phenomenon, with mathematical modeling to prove it. For example, there were many times when the team went home and built the next piece that was going to break clear. Funds were always tight, so these things were not done Willy Nilly, or as often as they might be. Often they improved performance but didn’t solve the big problem. The final foil was just one of these things. The boat was still stuck in the 40’s. After enough trials to see that it really wasn’t just a matter of set up or technique, they added a leading edge fence about the size of a playing card to the foil. This was done carefully, but not with 1000 hours of super computer simulation. Paul in a container doing it carefully, not in a clean room with laser guided CNC robots. Suddenly the boat started doing what it was supposed to do and kicked down all the trash can on the block. Talking to Paul, I speculated that the fence delayed the onset of ventilation; until it was securely at the speed when was a net gain. He contradicted that and said the foil wasn’t designed for cavitation, but to delay cavitation as long as possible. The fence just delayed the onset of cavitation a bit longer. Having gained a bit more experience with hydrofoil struts since then, I know that the design of the strut is far more complex than it seems. What was happening on the strut at the water surface was quite different from what was happening where the work was getting done. Sail Rocket’s main foil operates 180 degrees differently than any of the Hydrofoils on this page. The low pressure side is inclined way from the surface and the force vector is oriented down and to Windward instead of up and to leeward. As such there is much less tendency to gulp air (ventilate) or lose efficiency to near surface effect. On a regular hydrofoil, there is a point where there isn’t enough water over the top of the foil to carry the load. It’s like the bubble just pops. Because the water to Windward and below Sail Rocket’s foil goes all the way to the bottom, this is less of a problem. At least that how I think it works. SHC
  15. Steve Clark

    Team NYYC

    “The Beattie Varley report also noted an outstanding contractual disagreement regarding whether the $3 million paid by ACE to Team NZ to cover costs of designing the AC75 boat class could be considered an event cost.” This is what caught my attention. It seems very creative to turn the initial design process into billable hours. Pretty sure that has never been done before. Being a shit head, I wonder what the margin was? SHC