Maiden Voyage of Optimist 1

Published on Feb 8, 2014 This is the first of three Optimist dinghies we are making from CABBS (Cleveland Amateur Boatbuilding and Boating Society) plans. The plans have been redrawn from Clark Mills original drawings for the Optimist in 1947. Check out www.woodenoptimist.blogspot.com to see more about building this sailboat

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Optimist Building in Virginia Beach

Al from Virginia Beach writes in and shares pictures of his project boat...

NOTE: ALS UPDATES CAN BE FOUND AT THE TOP UNDER PAGE TITLED "Virginia Beach Optimist Project"

Im building the boat for 3 and soon to be 4 grandkids. I sail and my 2 sons sail, so getting the little ones into it makes sense. The oldest is 8 but lives about 300 miles away, so when next summer comes and we get to our lake house hopefully the craft will be ready to use.

Im using West System to coat and put this together but am not glassing the boat - extra weight that I dont want or need. My boat is Maranti plywood, 12mm for the transom etc and 6mm for bottom and sides. Ill make my own foils from 12mm also.  For the "solid" wood I have found some very nice and cheap spruce. I plan to use some mahogany for the rub rails - I have some nice pieces. Almost at the point of fastening things together since today I got the chine bent and straightened - that was fun and am glad I had as many clamps as I have, but one never has enough clamps!

Steps:

I fished a piece of spruce out of my pond and tried again with bending a chine.  I figure that 24 hrs underwater with all the enzymes and slop in my lily pond should make it pretty bendable.

I clamped the stern and mid ship positions and placed the above type clamps to make it parallel.  Then I gently bent the end of the chine toward the forward bulkhead and did two things. First I used a long clamp around the chine and the nearer stringer. Then I hung my tool bag with saws, drills and assorted heavy items on the end of the chine. I never changed the weight but I applied the straightening clamps and gradually tightened the long clamp.

The whole process took no more than 45 minutes and I never heard a creak from the wood.  When the chine was finally in position I removed the long clamp and tool bag and attached the chine to the forward bulkhead with a clamp. Not a screw in it yet. I will let it dry for a few days before removing clamps and attaching with screws. Then Ill see how the skin fits.

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Working on a July Launch Date for the Optimist

My brothers and I have slowed our building of the Optimist down to a crawl. However, my brother Darren has taken the lead and wants the first boat to launch on July 4th.

He has purchased sail, tiller and extension, blades (rudder, centerboard), gudgeons from APS - Annapolis Performance Sailing.

To protect the chine he has laid down a 2 inch strip of fiberglass cloth in simple-clear polyester resin. It should provide a bit of resistance to any "hard blows" on rocks that make up the shore of our part of Lake Ontario.

Polyester resin is quick to harden and very easy to sand. It costs about half the price of shipping epoxy to us. Its just a short drive to the auto parts to pick up a quart.

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Adding Hull Panels to the Optimist Pram

Adding the hull side panels was pretty straight forward. We hand-planed the chine logs so that they would be level along the bottom of the boat. We used 3/4" stainless steel woods crews from Jamestown Distributors. I set the width for the screw holes by spreading my index and pinky fingers wide apart and making that distance on the chine and stringer attachment points. We used about 50 wood screws per side panel. Liberal amounts of PL Construction Adhesive were applied along the chine and stringers and things went well.

A video of the experience:

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Optimist Pram taking real shape

For quite some time weve just imagined the Optimist sitting on the strongback, but now the outline of the dinghies has been reveled. Ric Altfather, president of the Cleveland Amateur Boatbuilders and Boating Society, offered us some good advice when assembling our Optimists. The bend we had to make to instal the chine is a bit too severe for most 3/4 x 1 1/2 inch kiln dried lumber. Ric recommended we soak them prior to trying to bend them in place. We let them float on the pool cover for a few hours - this seemed to work well. They would have snapped like a twig if they had not been soaked.

We are now contemplating the next step. We need to fare all the edges with a hand plane and sander to prepare for the eventual plywood skin that will make these real boats.

Part 4:



The three frames looking really nice in the garage.

To take the twist out of the chine at the center bulkhead we clamped a board to the stringer and then screwed the bottom of the board to the frame leg. We let the wood dry and take the shape for a couple days before putting the screws through the chine. Im not sure it is necessary to wait that long, but we had the time to let it dry and didnt rush it.

To mark the spot in the bow to let-in the chine, we used the paper pattern that was supplied with the CABBS plans. With the chine stringer well soaked I was able to spring it into position to check my pencil line. I made some slight changes to the template line to adjust for a better fit after cutting the notch.

 

I found that it was pretty easy to put a pilot hole in the frame leg to make the final cut for the gunwale stringer. I drilled the hole to match the angle that the stringer would be let-in. I cut from the front and then moved to the back to check that the line was being followed on both sides. I would cut a little bit and then check about three or four times to be sure I wasnt straying from the lines on both sides.

Here I am checking to see if the bow is perfectly parallel to the center frame by laying a board on the bow and sighting across. There was a very slight twist that I was able to remove by weighing down the corner of the strongback with some stones (see bottom left) and shimming one of the back legs.

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Building the Optimist dinghy frames

Winter is flying by, and we are diving into our three-boats-at-once project. We have spent some time getting to know the CABBS plans. Its helped to have found some pretty nice images of other folks working on their Optimists. Nothing like a picture to make things clearer.

Here is where we would like the project to be the next time we get to work on the Optimists:

Pictured below in red are the frame stations that we are working on in the accompanying video, and how they will support the other members. We have completed the bow frames (1) and attached the bows to the strongback. The bow must be angled back at 22 degrees as can be seen below. The rest of the frames (2 and 3) are perpendicular to the strongback.

If any readers happen to stop by and read this post and watch the accompanying video, feel free to leave a comment about the "real" way to build these prams. My brothers and I have sailed boats and fixed-up wooden boats, but weve never attempted to build any from plans. This has been a fun and challenging experience so far.

You may notice from the video that we have been using scrap lumber. We have a lot of odds and ends of wood lying around, so to save on cost we have used old lumber as much as possible. We need these boats to last about ten years - we will see...

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Virginia Beach Optimist Project

Update from Als project at the end of April, 2013:

Well, I really have been working on this baby but being retired takes up a lot of time.  For the last month I have been trying to get her finally ready for the water.  What this in essence means is that i have sanded, and sanded and sanded some more.  I have used every type of sanding device that i know of including wrapping a piece of sand paper around a 3/8" drill bit and sanding along some of the rough fillets.  What I have definitely learned is that neatness is worth a lot and I was not as neat with the epoxy as I could and should have been.  This left a lot of high spots and some really sharp edges that could do a job on little knees.  They are all gone now and another thin coat of epoxy has been rolled over all the unpainted areas, mainly the inside of the boat but also the spruce part of the gunwales.  I plan on attaching strips of mahogany as the outer rub rail and just vanrishing these.  No epoxy.  They are almost ready to attach.

I have made my mast and gooseneck from PVC..  The mast 1 1/2" pipe cut to length and then reinforced with treated wood and the goose neck is from a 1 1/2 x 1 1/4" tee.  My boom was supposed to be a 1 1/4" hardwood dowel but HD and Lowes both have ceased carrying that size (where i live) so the closest I could come was a poplar dowel 1 3/8" in diameter that I sanded down and have a nice fit into the 1 1/4" side of the tee.

I also found that my back couldnt take much more bending over to work on the inside so I made some 24 high saw horses that bring the boat to a perfect (for me) height to save my back.  Cute little things.

Today I attached to rudder.  Put the pintles & gudgeons on and took a lot of time to make sure I got it right. I think I did.  The rudder and tiller look really nice.  Hope they work as well as they look.

Now I am at the stage of what next? It appears that a dinghy dolly will be that project.  I havent found actual plans for one but have seen photos and  figure that I can make something close to what Ive seen that will fit the bill.

There is one more go round with epoxy filling some dings and gouges and no doubt some sanding after that.  Then it will be a clean up and Helmsman for the inside.  Really cant wait to do that finishing.

 

 

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Optimist Gunwale looking for the perfect design

Thinking ahead to the time when we will add the gunwales (gunnels) has got my mind racing. I remember dinghies I sailed as a kid, and they always seemed to have some sizable gunwales to sit on. Some of the plywood Optimist Prams dont offer much surface area for the helmsmans backside. I know our kids will start out in light wind conditions, but it wont take long for them to want to sit on the high-side and hike while sailing.

In my searching for the best solution for this design I looked at the Club Racer by Bateau. They seem to have a comfy looking gunwale, so I looked into the way they created their version. A complete guide to the construction of the Club Racer is located at: http://www.latitude2739.com/club-racer.asp It is a really nice looking Optimist that is the same as the epoxy/wood version of the Optimist as described by the IODA standards. Bateau claims that it differs in that it is much easier to build and will be more durable, and last longer.

They start their process with corner braces cut at angles to the sides and bows to create the width that will be the gunwale. Plywood is used for this process, but I think we could use hardwood to accomplish this same design using glues and screws to bypassing the need to encase the area in epoxy.
All photos - Youth Sailing Foundation of Indian River unless otherwise noted.

To build up the width of the gunwale on the sides of the boat, they employ the use of plywood spacers to hold off the inner strake that will define the inner side of the gunwale. The picture below shows a double piece of 12mm plywood used as a spacer along with an inner and outer strake and rubrail of 12mm plywood. I believe that makes a total width of 3 inches.

The bow and transom are finished of in less thick manner shown below:

 

With the substructure of the gunwale finished it looks pretty nice. Ive been contemplating how well this design would look if we finished the gunwales without a cap piece of plywood. The plywood works well in the Club Racer because it will be sealed with epoxy. Our boats will not have epoxy, and this makes the finishing of the gunwale, perhaps a bit different.

The Club Racer is finished off with a plywood cap piece set in thickened epoxy, and then the edge is routed to 5mm radius for comfort and esthetics.

All this great information and pictures came from the Youth Sailing Foundation of Indian River Co. and their sister site Latitude 27/39 Sail Club.

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Copenhagen Wooden Optimist

We have the navigation tab for the videos above, but would like to thank Mikkel for sharing the videos of his project.
The boat was built during spring/summer 2015 at ES Nord boatbuilding school in Hillerød/Copenhagen Denmark.

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The Clark Mills Optimist Short History

The Optimist Inception:
In 1947, the Clearwater Florida version of the “Soapbox Derby” called the "Orange Crate Derby" was sponsored by the Clearwater Optimist Club. There had been talk of creating a waterborne version of the Soapbox Derby racer. An Optimist Club member named Major Clifford McKay promoted the idea, and it finally made some headway with other members. He was in contact with boat builder Clark Mills about the idea and proposed a small sailboat that could be made for under $50.

Don Krippendorf, in 1952,
sails Sharkey

From the USODA Manual:
Mills started sketching and soon ran into a basic limitation. "Plywood was the problem. It comes in eight foot sheets. I could special order it ten feet long, but that cost a fortune, so I knew the boat had to be less than eight feet. Since it was hard to put a pointed bow in an eight foot boat, I made it a pram." So the size and shape of the worlds largest class was dictated by the dimensions of a sheet of plywood and by McKays $50 budget. Mills chose a sprit rig, to allow some shape in the poorly designed, often homesewn sails of the era. Mills vividly recalls the very first Optimist hull. "It wasnt pretty, because Major McKay wanted it fast, for the next Optimist Club meeting. I hammered it together in a day and a half with 10 penny galvanized nails, slapped on a coat of paint, and called her an Optimist Pram. We rigged her up in the hotel lobby where the Optimist Club met."

Clark Mills in 2000

The Decline of the Pram:
The Optimist was mainly a Florida phenomenon until 1958, when Axel Damgaard, the captain of a Danish tall ship, visited the United States and was inspired by the design. With Mills permission, he took an Optimist back to Europe, modified it, and renamed it the International Optimist Dinghy. The IOD had a battened sail and much simplified running rigging. The new design spread quickly, first through Europe then all around the world.

The IOD collided with a large, established fleet of Optimist Prams in the U.S. As more and more IODs landed on the shores of the U.S., regattas were scheduled for both Prams and IODs. As late as 1985, separate regattas were held for both boats. Many sailors from the 1970s and 1980s owned two boats, to sail in both types of regattas. In the early 1980s, the scales were tipping in favor of the IOD. The number of Prams steadily declined and, by the mid 1980s, Pram racing opportunities had dried up.Today, Prams are occasionally found in learn-to-sail and community sailing programs but they are no longer an organized class and are virtually never raced.

1948 Optimist Pram /  International Optimist Dinghy 

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Optimist Pram Project Starting Back

After an exciting summer of sailing and sailboat racing, we are returning to the Optimist project. In the effort to make these boats as inexpensive as possible we have purchased luan plywood to sheath the hull of our boats.

Our decision to use luan was based on information given to us by John Bridges who has been building Optimists since the 1960s. He has built Optimists of luan and they have been in service for over 5 years. That is longer than we will probably need the boats.

We will also be stacking these hulls after sailing them - leaving no water in them to cause problems. Additionally, we will be priming our hulls with CPES (clear penetrating epoxy sealer) as a way to be sure that the absorption of water is slow.

Today, we worked on the hull sides.

1. Working on three boats requires 5 sheets of plywood to complete all the hull skins. 
2. We ripped two full sheets on 16 inches the long way. This gave us 6 strips to use as hull sides.
3. Temporarily attaching one side to trace the contour, we removed the piece and cut a bit proud of the pencil line. 
4. We checked to see if the template piece fit all three hulls - it did.
5. Using Locktite PL Construction adhesive, we laid a bead of glue along the chine and bow/transom about half way down the hull.
6. Starting at the transom we worked forward placing screws about 5 inches apart.
7. We worked in a zig-zag pattern of top then bottom as we worked forward to be sure not to pucker or buckle the plywood.

Starting aft and working the plank forward.

One side of the hull secured and curing.

Three hulls with starboard sides attached.

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Building the Optimist Strongback

The least complicated part of boat building is the strongback or base with which to attach the stations or molds. Clark Mills designed the Optimist with only three simple molds - bow, mid-frame, and transom. This strongback gives the builder a good base to attach the three cross-members that will set the precise distances for the bow, mid-frame and transom.


We are building three Optimist at once, so here is a quick look at our three strongbacks using the CABBS plans:

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