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Designer

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Designer last won the day on February 22

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  • Birthday 01/01/1

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    Vandemere, NC

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  1. Designer

    AWL

    Amos, The Gulf Stream crossing was very easy. We sat at Bimini for a few days waiting for a norther to pass. By lunch time on the day before we expected to cross, the forecast said the wind had shifted east and the swell was dropping so we were underway by 1:00 pm. It turned out fine and we were anchored up in West Palm Beach before dark. Of course we were running at 10 knots and the stream gave us another 3 knots. We can cruise at an easy 15 knots but 10 suited the conditions. You cover a lot of ground at 13 knots. I pushed for turning up the axis of the stream and be home in a couple of days but the owner nixed it. In retrospect I enjoyed the trip up the waterway. Watches meant pushing the left or right buttons on the auto pilot every couple of minutes and watch the world go by. I never saw any conditions that Carlita could not handle easily. We just need a good weather window to make up for our lower speed.
  2. Designer

    AWL

    Chick, It seems like you know me too well.
  3. Designer

    AWL

    I have been absent without leave for about three weeks leaving Alan to fend for himself. He appears to have done such a good job I might have to sail more. The owner of the big power cat that we built, called me and asked if I would like to help him bring her back home from the Exumas. It too several nanoseconds to say yes. His intended crew had injured himself and had to return home. I was able to delay my departure to see the first two days of the Family Island Regatta at Georgetown. It is the biggest sporting event in the Bahamas. The Prime Minister and Governor General among other notable dignitaries attend the awards ceremony. I never did find out what the design rules were but the theme was to install the tallest mast that they could get away with and if you want more sail area just make the boom longer and add foot round until it drags in the water. I understand that they now have to return with all of the crew that they left with but they appear to adjust the number of crew for each race to the expected wind strength. The fleets were big and I think that there were four classes. I do not think that #5 would pass the Coast Guard level flotation rules. I was pleased to see that the Osprey's were doing well. There were not that many in Florida or Georgia but the Carolinas had lots of nests with chicks looking like they were almost ready to fledge.
  4. Designer

    Just want to say thanks

    Hi David, Thanks, I always appreciate the compliment and that the boat works for the way that you use it. People are always asking me "which design is my favorite". I usually answer "all of them". I get to recall all the effort, compromise and development that went into each design and the modifications and improvements that have been made along the way. Marissa is up there as one of my best. After designing and going through the prototyping of the Ocracoke 20 I thought that a lot more people would like a smaller cheaper, simpler and quicker build that would be very economical to run. It turned out that I was totally wrong. There have been quite a few built but the Ocracoke 20 sells better. I built the prototype to prove that the our new chine flat construction method worked and that she would perform as calculated. The chine flat method worked so well that I redesigned all of the Ocracoke and OB series to incorporated it. As for performance, I used Savitsky's method with the Blount modifier for the performance curve. In reality she turned out better at the top end and worse in the hump. As nobody should run in the hump range (9 - 14 knots) it turned out well. It is just a curiosity as blount was added to improve hump speed calculations. I recently sold my Marissa, much to the dismay of my granddaughter (her namesake) because I don't have enough space for any new boats. The good news is that she has only moved next door and I get to see her whenever I want and get to ride on her occasionally.
  5. Designer

    Ocracoke 20 in OZ

    Len, That Z shape is norml. If the chine flat was horizontal, the WL would be perpendicular to the CL or kicked forward if the flats were angled up instead of down. Just tape to your laser line.
  6. Designer

    Call for a BandByachts ice boat design

    Hey Beacher, I do not know anything about iceboats. I understand that the people who live in the frozen north get so bored in the winter that they become brave enough to face the cold and go sailing. Where I come from, ice is put to the more serious task of cooling drinks. Is it a boat if it does not float? Just kidding, but seriously I do not know anything about iceboats. I think that it would be had to beat a DN.
  7. Designer

    Trailer for Core Sound Mark 3 boats.

    What Ken is talking about is what I call the winch pylon.
  8. Designer

    Trailer for Core Sound Mark 3 boats.

    Steve, This is a good idea to keep the trailer talk in one place. As has been discussed, dealers are used to big heavy boats with a big outboard on the transom. This trailer will cost more, add a heavier load on the tow vehicle and result in lower gas mileage and give the boat a harsher ride not to mention being a lot harder to man handle. My trailer has been under many boats. It was originally built for a 20' cat which meant that it had to have a narrow wheel base to fit inside the hulls. The advantages are maneuvering is tight spaces is great and the trailer is long and supporting more of the boat. The main disadvantage is that the boat is high for climbing on board. I used to have 13" wheels but found that 12" rims fit on the same hubs. This does not seem like a lot but the tire thickness reduction as well as the smaller rim lowered the boat about 3". Carlita was towed 13 -14 k miles last year without any wheel or bearing issues. I prefer to not put the bearings and electrics in the water. This means that the boat needs to roll off the trailer easily. To achieve this, you need lots of smooth running rollers down the keel line. I watched Joe launch his EC22 at the messabout and she rolled off perfectly. At least 5 sets of keel rollers. This is also kinder to the boat. The next consideration is the bunks. They need to be set at the lowest point of the hull which is about midships on our boats at their transverse position. This is not always easy on powerboat trailers as they are usually set too far aft. If the bunks are not at of the lowest part of the hull, they will lift the keel off of the rollers causing lots of friction as the boat rolls aft. The transverse position for the bunks is not that critical in the mk3's as there is plenty of structure above the bunks. I would just locate them above the trailer frame. I like all of the boat to be carried on the keel follers and use the bunks just to stop the boat from tipping. I do not think that roller bunks are necessary on a boat this light but I am going to switch my carpet to starboard. I think that properly set up you do not need a tilt trailer.
  9. Designer

    Chick's Micro Power Cruiser Project.

    Whoa Chick. Has that cold mountain air gotten to you! If I did not know you better I would be wondering if you have gotten a little close to some of that moonshine.
  10. Fred, I will work on it. I am also updating the dodger plans for you. I have been working on being able to produce the adapter swivel at an affordable price. I am planning on being able to CNC cut the swivel body from UHMW plastic. I have built a cutter for machining the races and will make up a new swivel and give it a good testing.
  11. Designer

    Outboard advice

    Ken, Comparing the specs on the two engines, they are identical except that the VMax has a bigger gear ratio and 4 valves per cylinder instead of two. Because you will be pushing a big heavy boat compared to say a bass boat, the taller gear will allow you to have a bigger prop which would be more efficient in your performance range. As you will mostly be operating at around 3500 - 4500 rpm you may not notice the difference with the two extra valves per cylinder. Both motors will do the job well but if the price difference is not too great I would want the bigger gear. As this is a new motor and therefore has no reliability history yet, you will have to trust Yamaha's reputation and their three year warranty. They do have some history with the VMax in the bigger range so I guess that they have it sorted out so you should be good.
  12. Designer

    Chick's Micro Power Cruiser Project.

    Tom, I would have doubled your salary if you had asked.
  13. Designer

    About LWL line on plan of Vacationer

    Mehmet, I do not know much about the vacationer but the blue line is intended to be the LWL. That said I would paint the water line above the blue line as it looks a bit optimistic to my eye that it would float that light in it's normal operating load with people on board. Remember that the water is rarely flat and small boats are rarely in perfect trim.
  14. Hi Matt You are right, it is a lot of stuff. Wind pressure goes up or down by the square with wind speed. For instance if 16 knots of wind is perfect, then you are only getting 1/4 of wind force at 8 knots. If you can add more sail in light air it can add a lot your performance. When the wind gets lighter still, say 4 knots you are only getting 1/16 of the wind force. Sometimes the boat just feels stuck, what is happening is that the sails are stalled and it is hard to feel what is going on. Adding more sail can sometimes get you out of this stalled situation and move the apparent wind forward and get you moving really well. It can sometimes mean the difference between not moving at all to coaching 3- 4 knots out of the boat instead of being stopped. To answer your question, the spinnaker is bigger and has more effect over a staysail. The staysail has less stuff to get and is all inboard. It just depends on what you want to achieve. When the wind is way forward, the spinnaker will give you some lee helm. You can lower the board all of the way which helps. This is not a problem in light air but is can get heavy in strong winds. When this happens you can bear away and solve the problem but if you have to sail that course, then it is time to furl it up. I have never tried to fly both at the same time, feeling that the staysail might rob more from the main and mizzen than it gives and just concentrate on making the spinnaker work as efficiently as I can.
  15. Well, it did not make Dawn Patrol any faster, they already had the spinnaker but the top down furler certainly made spinnaker hoisting and dousing quick and easy so that they could use it even on short legs where they might not normally feel that it would be worth the effort or use it in more marginal conditions knowing that they could easily get rid of it. I have been lusting for a top down furler for a long time as I usually sail Carlita solo or with my dog. Mandy does not seem to care about that pretty red, white and blue asymmetric spinnaker. It was the price tag of around $1000.00 that discouraged me. They have been in use for large short handed boats for some time now but it appears that manufacture's cannot be bothered with those of us who sail small boats. I started to design one for myself. As I delved into how I was going to make double concentric ball races it occurred to me that I could just make a swivel and insert it into Ronstan's bottom up 60 series furler. I showed the drawing to Alan and said that I would make one for him for the EC, he just happened to have an R60 on Mosquito. We ordered up some torlon balls and I got to work on the lathe. What makes the top down furler different is that the furling drum does not connect to the tack of the sail. The drum is connected to a torque line that turns the top swivel so the top of the sail winds up first and starts removing that extra cloth from the middle of the sail before the foot of the sail starts to wind up. . The tack is attached to the second swivel which makes it independent of the furling drum. Bottom up furlers work okay for relatively flat cut sails but top down works better for spinnakers. The first picture shows our shop built swivel waiting for the torlon balls to arrive. I got lucky as we tried a spare length of dacron braid that just happened to be twice the length of the hoist. We tied it as a double line and it seemed to be about right. The shackle showed that it might foul or at least chafe on the sail as it rotated. I rounded out the shackle hole to reduce chafe and replaced the shackle for multiple wraps with a light lashing and eliminated the problem. Drum furlers won't work because they cannot hold enough line. You need the endless line that just has a single turn around the drum giving unlimited turns. They are also less sensitive to line alignment which allows the drum to out-hauled to the end of the bowsprit or in-hauled as needed. Here is the email that Alan sent the first night of the EC. spinnaker flying all day furler works like a dream. 14knots recorded. heard a sea pearl capsized have no more details. having fun. Boat feels old hat at this.
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