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Designer

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Designer last won the day on July 15

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  • Birthday January 1

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    Vandemere, NC
  • Supporting Member Since
    06/17/2019

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  1. We want to borrow your elves. Kidding aside you did a superb build. I hope that you get to keep this one and can find the time to enjoy her.
  2. Wasserboot, I did not know that they made anyone that tall. It is important that can sleep comfortably so I take back my statement that nobody would need a bunk that long. If scaled lengthwise another 5% the midship berths would be 2.16 and the quarter berth would be 2.774 and the length of the boat would be 7.825 long.
  3. Wasserboot, The berths on the MF246 are 6'9" or 2.057 long. The quarter berth is even longer. I would not scale it any more because the volume increases too fast. It could be scaled by different length , beam and height factors but it rapidly becomes a new design. You surely do not need any more length in the bunks so moving bulkheads starts to get more complicated. As for windage, less is always more desirable. I think that it is still a reasonable trade off as the extra power gained from the stability helps to overcome it.
  4. Hi Fred, Fortunately it is an easy fix. For the hull bottom, you need to grind the glass back to the bottom of the crack and same for the delamination, then relaminate it back. Kevlar has great abrasion resistance which I would consider if I was intending to be scraping the bottom on rocks. The local loading can be considerable when a boat is lowered gently onto a rock but in a dynamic situation I am surprised by how little damage there is even if it appeared to be not a heavy duty situation. You certainly mitigated the damage by jumping into the water, I am glad that you did not get damaged. As for replacing the inside with kevlar, I don't see the need to go beyond glass. Even with a much stronger inside skin, if it delaminates you do not have anything. Grinding back to sound wood and relaminating back with glass should be good. You can add some extra layers of glass if you like as it won't cost much or be hard to do or add weight where you do not need it. As for the board, you do not need to replace it. I would grind down say 1/4" at the joint to a 20 : 1 taper and build it back up with layers of glass until it is fair. Carlita's butt join in her board is still going strong. Good luck with the repair.
  5. Joe, A wood centerboard is the most expedient way for the home builder to make. On the MF I wanted the toughest board that we could make. By machining two half molds out of MDF, it gives Jay a simple way to to lay up a solid glass board that should be practically indestructible. There is no wood to swell and there is no need for a lead tip. Not to mention that it will be a perfect foil. We made the rudders on the big cat this way and they have been through a fair bit of abuse so far without any issues. If Jay can get his to pop out of the mold without damage, you could lay yours up in the same molds.
  6. Hi Morley, We recently had a builder bring his CS17 over to the shop to sell for him as he is getting older and no longer uses it. She was built in my boat building class under my supervision by a tool and die maker using the best of materials. All of his joints were perfect. The boat was lightly used. The boat pictured is the one that followed his construction in the class and this owner copied his color scheme except that it has a varnished deck. It is in mint condition. All paint is AwlGrip. If you are interested you can email me.
  7. Wasserboot, I am glad that you like our MF 234 and 246. I think that she will be an excellent boat for your waters. We have similar conditions here in Pamlico Sound which is large and shallow. Alan and I went through a list of boats to add to our web site yesterday. Alan has taken on the web site and has done a great job but we have been overloaded with work lately but digging our way out so expect to see some changes soon. Yes we will be listing the plans on the site.
  8. Ken, No Ken, you tower over me by an inch. There is just 6' headroom in the 234 version under the cabin crown line, so you should be okay. The bunks are 6' 6" long. The 246 version is naturally 5% larger in all dimensions. The air draft is 28' 4" so you will have to lower the masts to pass under the bridge which is not a big deal with them both in tabernacles.
  9. I have been designing the Mathew Flinders for myself for more than a decade off and on, long before we did the Mk3's. What I was trying to achieve was to design the ultimate small voyaging boat that could easily be trailed behind a reasonable size vehicle and yet be be capable of crossing any ocean. She had to be built tough and live well for two people with room for a third person. She is not intended to replace the mk3's as they are great boats, but for anyone who wants to go up to the next level. I went through hundreds of iterations till I finally got it and I am very pleased with final outcome. As you can imagine I am really excited to see her come to life with Jay and Carol. I started at 22 feet and it finally grew to 23'4" as I massaged the ergonomics. When Jay ordered the boat, I did a lot of thinking about his comfort plus I had some interest from people who are a lot larger than me so at the last minute I scaled her by 5% to give 6'4' headroom with the final length at 24'6". If anyone has to have 6'6" headroom they can raise the cabin sides. The trailing weight will be around 4000" depending on how they load it. I am still planning to build the 23'4" version. One of the things that I worked hard on was the range of stability. She has positive stability to 180 degrees which more than meets the EU ISO rules for ocean sailing. I have attached one of the many stability curves that I made with the red and blue curves showing a best and worst case vertical center of gravity. That is to allow for builders to make their own modifications and still meet the high range of stability. I was also able to calculate the Flicka A well known small cruising boat, @ 20 degrees for comparison.
  10. Ben, your boat is looking good. The gunwales give the top half of an open boat lots of strength. Another function is to give the top of the boat a finished look as it defines the sheer line. The reason that I stand the gunwales above the sides at the ends of the boat is twofold, it is more aesthetically pleasing if the gunwales are tapered slightly at the ends. You will notice that the sides have more flare at the ends, especially at the bow. If the top edge of your gunwale is 90 degrees to the sides which is normal, the top outboard edge continues to angle down below the plane of the bow transom as it goes forward. I like the knees to follow the camber of the transoms and the gunwales top edge to follow the camber of the transoms. After installation, it is easy to dress off the top with a plane using the bow and stern transoms as a reference to get the angle just right. I dress off the transom beam tops to the gunwales at the same time. I always enjoy this part as it really brings the boat to life. At the stern transom centerline I leave the top edge square which matches an outboard bracket if I will be using one. From the outboard pad I plane a twist as I work out to the quarter knee You must glass the keel line on the outside. Plane a 3/4" wide flat the whole length of the keel before glassing so that you will have a landing for the keel. To keep the flat horizontal, I monitor the flat as I go by setting my plane centered across the flat, I can see if the gap is larger at one end and then plane a bit more on the appropriate side to keep the flat horizontal. You may be more comfortable using a small level as a guide but make sure that it is square to the boat when checking.
  11. Hi Joe, I like it. It is still a work in progress. I am happy with the deign but I have not solved the production procedures. I am now making the body out of Uhmw plastic which we can cnc cut. I made up a cutter to machine the scores for the bearings. That all works okay, the issue is the stainless steel center. Our lathe is old and it takes a lot of time to make to the precision that I want. We do not have a mill so I have to grind the flats by eye and drill the shackle holes. Maybe if I switch the center to bronze it would be easier to make and accept that it will tarnish. If we could find a machine shop that could crank out a few at a reasonable price would be good. Alan used Carlita's swivel in the EC and it held up well. Work has got in the way of play and I have not used on Carlita this year.
  12. Hi Ben, You do not need to bevel the ply. We prefer leaving that gap so that it will fill with epoxy when you lay in your fillet. The bevel for cutting the stiffeners can be taken from the quarter knees. Most people do not even bother with beveling the stiffeners just filling the gap with thickened epoxy. I like to bevel them but if you get it wrong and have too much bevel you will have to trim it off which can be difficult because it is across the grain. I find that a mini grinder with a sanding disc will allow you to trim it easily. On the same note; when you screw the sides to the transom stiffener, you need to just draw in the screw until the sides just touch the transom. If you tighten the screw it will pull in a fish tail when viewed from above. I need to look at that plan to be sure that I give correct advise because there have been some options, the way I intended it was as you interpreted it. The 1 x 2 should be fitted round the vertical reinforcing. Because the transom rakes, you need to bevel the top edge of the 1 x 2 so that the ply top will sit flat.
  13. I remember having a hard time getting Carlita off the trailer while I was at Port Townsend. I have worked on my rollers since and they all turn smoothly. The forward roller is grey but it is not in contact when the boat is being pushed due to trailer flex. The next two are yellow and the aft one is one that I made out of uhmw plastic and it rolls very well. I usually launch Carlita at the shop and use the tractor where I can keep tilting the trailer until the boat has no choice but to roll off. I had a really difficult time launching Carlita at the ramp in South Carolina. I started with the wheel bearings clear of the water. It became very clear that there was no way that I could get it off without going deeper. I cannot remember how many iterations I went through including climbing on the boat twice to make sure that it was not he centerboard causing the problem. The exhaust was almost in the water by the time I floated the boat off. I had spent a good deal of the previous day on the trailer lights and hated to have to submerge the trailer. I want the boat to roll off easier than Petes trough as I am still not keen on submerging the wheel bearings. On Friday evening I refined my version of Pete's trough but with 10 home made PVC rollers. Wish me luck. I will let you know how well or bad it works.
  14. It is true that we were off sailing instead of attending cup holding classes but we elected to leave the builders to personalize their boats their own way. Carlita does have a cup holder along with a paper towel rack. This is the fun part, the boat is done and there is no pressure produce, now you can play and make the boat live how you want. God work Amos.
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