Jond Posted October 4, 2015 Share #1 Posted October 4, 2015 This build is to be a prototype for potential group of RC boats to race at the Boothbay Harbor Yacht club. First let's discuss why this might be a fun and useful project. LOA:21' LWL:18' 9" Draft:3' 6" Beam:5' 6" Sail Area:227.00 sq ft Displacement:2,100.00 lbs From Wikipedia "..Geerd Niels Hendel (14 January 1903 - 30 March 1998) was a naval architect and native of Germany. He found success in the United States becoming a prominent yacht designer who had a hand in an America's Cup victory in 1937. In 1935, Hendel became chief draftsman for the legendary naval architect Starling Burgess, who at the time was living in Wiscasset, Maine, and working on various projects for the Bath Iron Works, in Bath, Maine In 1936, Harold Stirling Vanderbilt engaged the Bath Iron Works to build the America’s Cup Defender Ranger, the greatest of all J-class yachts. Geerd Hendel worked with Starling Burgess and a young Olin Stephens on putting together the working drawings (see Olin Stephens’s book, All This and Sailing Too). From his work on Ranger’s aluminum masts, Hendel became one of the early advocates of the use of aluminum in yacht building. That summer, Hendel became a US citizen. In 1938, Hendel designed the 21-foot fin keel sloop known as the Boothbay Harbor One Design, the culmination of almost a decade’s work of designing, building, and then testing his ideas for fast racing sloops. Geerd Hendel and Starling Burgess actively raced the Hendel Racing Sloop during the years leading up to World War II. ......" There is more history available through the Boothbay Harbor One Design association, which is hosted on the web site for the Boothbay Harbor Yacht Club.. http://www.bhyc.net/bhoda.html The short version is the wooden boats were built in the local area through the 1940's and 50's. In the 1970's fiberglass hulls were made. My understanding is they were using cork within the glass element instead of cold forming method . Starting in 2007 two wooden 'original' design were built through the Brooklin boatworks. They took the original design and rebuilt the documents and molds. The first build boat was named Eight Bells and she is in Boothbay Harbor. the second build included much work at wooden boat school. She is named Osprey and is easy to find on the internet as it is looking for a new home. Since 2009 a few wooden boats were skinned with two coats of 1/8 cedar veneer and resin. There is a practicum on this process for the boat Bittersweet, No 20, done by the Brooklin boat yard. Finally David Nutt has built a few cold mold form, [4 layers[, at his boat works in Edgecomb Maine. All together there are between 50 to 60 of these boats still sailing and many are still here. There are also several very similar ' sister' boats including the Hodgdon 21 [built by Sonny Hodgdon] also wood hull keel boats, and the Christmas Cove 21 all fiberglass. A similar 21' boat class also the Great lakes 21 lives in Ohio. I am now the proud owner of Bittersweet No 20. I am hoping to learn more of its History. I am told it was owned for many years by the Reed family. . I found this photo on line and see the extra long fore-deck and after deck, an option in the 1938 design, that matches Bittersweet, so I think this is the same boat. ...Here are before and after images by Brooklin boatworks showing the 1941 built Bittersweet getting her new skin. Note the white transom? Part of my research will be to understand when was that changed from the original Mahogany design. ...Here is the post skinning look at Bittersweet. Still lots to do. The new owner decided to make her a beautiful dark green. He sailed her a bit but she currently is in a barn ready for more work. The plan is by next summer we shall see a new white interior and rigging all ready to resume racing. Modeling As to modeling, this project is not a complicated whaling ship, bark or multi-masted fishing schooner, but it is a real classic Maine sailing design. There are many families with long histories of this boat and a thriving youth sailing program all in the same place. Races are Wednesday afternoons and 5-6 weekends through our short summer. They are perfect for fun sailing in this great harbor. My goal is to show up next June with two working radio replicas to race at the club. The first two will be proto types. Ultimately I need to have a choice of either a wood design with wood mast or the fiberglass [ same lines] with an aluminum mast. For now that is shape the spruce and paint "aluminium" but we'll see when we get there. They are also great for a foggy day dockside. The first step in the build is to get plans. Fortunately the Maine Maritime Museum in Bath has a complete set dated 1938. I am aware that new drawings were created for Eight Bells a few years back and I am looking for them too. I also have Bittersweet and a dozen others to photo and copy. A big challenge for Radio sailing is the fact the jib clews trail aft, past the mast and shroud. Most radio sailors are modified and jibs are redesigned to be a ' self tacking' style so like the Main sail it is only in and out, geared by one pulley to be 50% of the main and can therefore share the same servo. We shall get into that as I have the same issue on the other boats I am working on, Charles Notman a 4 master with a flying and outer jib and the Dancing Feather a Boston Pilot schooner with Jib and flying jib. I took the plans to Staples to get scanned into PDF's. I then took the image I want ....say station lines .. and saved them as a jpeg. I can then open it in Adobe Photoshop Elements where I can rotate by fractional degrees and using the grid get a plumb image. I then save as a new PDF. I open the new PDF , take snap shot image and paste that into Turbo Cad Deluxe 20. To build the model, I take the section lines and tweak them to align with the Keelson / side view section lines. I then added the detail framing section and align it below to take on the detail and better understand the build. Similarly I include the framing sections in scale to the lower right. Now I need to build the ten station sections and transom. I go to the station lines and add layer by layer, tracing the line and then using mirror copy to complete each station mold. I then add common legs to attach to the building board and cut outs for the keelson. I set up a page for each station with its unique named view in the model and viewport on each page. Finally I offset inward the equivalent of the planking so when I finish the planking, we are back to at the final shape. Here is what gets printed out and glued to the luan plywood. Keelson assembly planning Now we have all the stations we need a keelson assembly. This approach takes us away for scale modeling replication to building a model that will sail. To understand please look at the image of the boat framing including the 'floor' sole and keel attachment. One can see in this framing section there is nothing but bilge under the floor except for the floor timbers. For building a static model there is no problem, but to sail we need to transfer to load from the hull into the keel. It might work but since we can not see below the floor, we shall use that space for structure [ nee the keelson]. We will discuss more as we build out the detail in the open cockpit. The keelson assembly.... We need floor timbers to support the flooring but also we need to add and extension to the keel.....keelson.. that goes stem to stern. due to scale and size of printer we need to make this in three printouts and then attach. here is full scale of the aft section of the keelson we are ready to start the build hexnut, michael mott, augie and 5 others 8 Quote Link to comment Share on other sites More sharing options...
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