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When designing a stitch and glue hull for plywood composite construction and all developable panels, how can one predict how the plywood will bend? Modeling designs in Rhino is one thing but I have no idea whether the wood will conform to the developable shapes I am modeling. Location: auckland nz bending ply Here's a jpeg of the bow sections of the CBSkimmer - in 4mm meranti plywood. Bending ply requires some patience and slowly increasing clamp pressures, plus a few judicious saw cuts in a couple of high tensioned areas (but watch out the whole thing doesn't explode like a spiked balloon).
Location: maine To calculate how far a panel will bend, rip a strip of it and bend.
I've done coamings without steaming by laying them between two supports for a couple of weeks in the summer with weight bowing them down. Location: Utah Can anyone offer any insight into the phenomenon I described in my last post?
I would also be interested to know if there is a commonly used term for this phenomenon, which would allow me to search on it to find more info. If you take a cut across a simply curved surface in any direction other than perpendicular to the curvature plane, you will be cutting across some portion of the original curvature.
For prediction, I would imagine the amount is directly related to the angular difference between the section cut and the conic (if present) radial line or surface 0 isobend (don't know the term - 'contour' where bending = 0 ) factored by the amount of curvature or bending (perpendicular to the surface) that the panel has at that averaged (if twist) curvature location.
The situation you are describing sounds to me like the conical development you will get anytime you induce twist into a rolled sheet. I use several surface development software packages to design hulls, and I normally export the design data into Autocad to finish the drawing.
I normally draw a fair chine in elevation and plan and then adjust the keel profile to suit, while adjusting the origin points of the conic projection lines. If I haver had to alter the lines in Autocad, I then go back to Prosurf or Rhino and change the lines accordingly so I check the hydrostatics. What I have found is that performing a conic projection produces a possible conic solution to how the plates will sit, but it is not always the solution that the plates will find.
There may be (certainly are in fact) much smarter people out there who know things that I don't about developing accurate cross sections. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
The lid is now on and other things like the radio box were secured in and sealed.  I also made up a bracket to support the rear of the pipe. Very close now but just not quite enough hours in the weekend to get it watertight and ready for it’s maiden voyage.  A special thanks to Tim for helping me out too! Ok, so now i’ve got the fuel tank all sorted, the Flex drive is all installed and set in epoxy too. Ok, some time ago (just over a year now) I decided that the whipper snipper in the shed with a broken flex shaft had more to accomplish in life other than the tasks of a mere garden tool.  It was with this that i decided to build a boat! In the 4 weeks since my last update, I have worked 24 hours on Foresail 1 and have finally completed her assembly. I found the cabin side cleats challenging to install and ended up laminating and cutting curved cleats to match the concave curvature of the top edge of the cabin sides.
This past week spent most of my time installing cleats for the seats and the cockpit sole and the deck and cabin beams. I installed the deck and cabin beams this week, glassed the outside of the mast trunk where it goes through the cabin top, and work on the centerboard mounting details (bronze spaces, end caps, etc.)  I have a few more fillets to make and one more coat of epoxy to put on cleats and then I will be installing the GARBOARD  – Yeah!!!
Since my last post I have been busy attaching all the bulkheads, the seat longitudinals, centerboard trunk, stem, bow panel, and mast trunk to the boat. I secured the stem in a plumb position by clamping it to a 2×4 attached to the ceiling. I screwed cleats to the temporary kit braces and then clamped those to the builkheads to secure the builkheads in exact position for planking, etc. Before I epoxy any new part to the boat, I ensure the fit is exact (plumb, square, tight) and I make sure I have done all the work that I can on the part I am installing and on the parts that have already been installed.
I assembled the 4 piece mast trunk and filleted the inside corners before installing on the boat.
2 piece centerboard joined together after routing out cavity and filling with 18 pounds of lead shot. I needed 18 pounds of lead for the center board trunk, so I got creative and bought 25 pounds of exercise weights (like ankle weights, etc.) from a lady on Craigslist for $15.

Hard to believe when I put this all together I will have a very seaworthy microcruising boat like the picture below.
This is what the completed boat will look like (this is the Prototype boat owned by Josh Colvin). Location: Upstate, NY Building A Raft From Scrap Wood And Barrels Whats goin on, my names jesse hicks, i am 17 and I, along with my friends have decided to build a raft from spare peices of plywood, 2x4, 2x6, crate pallets, and plastic barrels as flotation. CatBuilder Previous Member   I'd say have fun and just bring enough life jackets for everybody!! Location: Upstate, NY omg you have no idea how close this looks to ours now! Location: Upstate, NY heres an image i found on google which kinda looks like our goal, the only difference is our way of flotation and propulsion, i think we may tow it, if not just mouring it. Location: La Florida Maybe you should hang the firebox over the water to protect the raft. Location: Newcastle-Upon-Tyne Before you close all other doors, consider other floatation options - barrels are very slow and inefficient.
Delivering ultimate quality service and satisfaction is what will help us soar above the rest and maintain a well established reputation, We have built over 30 yacht of different lenghts between 20-45 meters in the past 30 years. Besides the fleet of vessels delivered, the newly designed  yacht construction have unique concepts where we intend to change the standard of luxury yachting forever. Until the 1950’s, almost all yachts were made of wood or steel, but a much wider range of materials are used today.
The use of wood has changed and is no longer limited to traditional board based methods, but also include modern products such as plywood, veneers, skinned balsa and epoxy resins. Sailing yachts can range in overall length (Length Over All = LOA) from about 6 metres (20 ft) to well over 30 metres (98 ft), where the distinction between a yacht and a ship becomes blurred. Cruising yachts are by the far the most common yacht in private use, making up most of the 7 metres (23 ft)-14 metres (46 ft) range.
These yachts are generally 25 metres (82 ft) or longer, In recent years, these yachts have evolved from fairly simple vessels with basic accommodation into sophisticated and luxurious boats. On the biggest, 130-feet-plus (40 m) luxury yachts, every modern convenience, from air conditioning to television, is found. Racing yachts try to reduce their wet surface area, which creates drag, by keeping the hull light whilst having a deep and heavy bulb keel, allowing them to support a tall mast with a great sail area.
The motive force being the wind, sailing is more economical and environmentally friendly than any other means of propulsion. Monohull yachts are typically fitted with a fixed keel or a centreboard (adjustable keel) below the waterline to counterbalance the overturning force of wind on the vessel’s sails. Our long expertise in the sea will do the job for you in delivering your yacht for sale that you will choose from our portfolio. Other plys will bend even further, like Hoop pine and of course the expensive aircraft plies in 1.5 and 3mm guages.
Any sheet material with conform to what is called a developable surface, whic is essentially a section of either a cylinder or a cone (or combinations of cylinders and cones). We are still brewing up our ideas together in which we will decide on the final design, however so far its looking like we will be setting up the raft in demensions of pallet size ( 6 pallets by 4 pallets ) and the propulsion is undecided, if there even will be. If you just want it to float, then these are great, but if you think that in future you might want to grab a pair of oars, then you might have difficulties.
It is a little known fact that Turkey ranks fourth among the world’s luxury yacht producers with 10% of the large yacht production.
The yacht construction are realized under the supervision of foundations which are recognized as first class within the international marine society such as ABS, Lloyds, GL, BV, RINA and internationally accepted principals and standards such as MCA, SOLAS, IMO and MARPOL. Although wood hulls are still in demand, the most common construction material is fiberglass, followed by steel, aluminium, carbon fibre, Compozite and ferrocement (very few because of insurance difficulties). Wood is mostly used by carpenters or wooden boat enthusiasts when building an individual boat.
Most privately owned yachts fall in the range of about 7 metres (23 ft)-14 metres (46 ft) , the cost of building and keeping a yacht rises quickly as length increases. Sometimes called dinghies, they often have a retractable keel, centreboard, or daggerboard.
These vessels can be quite complex in design, as they need a balance between docile handling qualities, interior space, good light-wind performance and on-board comfort. Sailing yachts of this size are often highly automated with, for example, computer-controlled electric winches controlling the sails.

Modern designs tend to have a very wide beam and a flat bottom, to provide buoyancy preventing an excessive heel angle. A hybrid type of vessel is a motor sailing yacht that can use either sail or propulsion (or both) as conditions dictate. Vessels less than 7 metres (23 ft) in length generally carry a petrol outboard-motor of between 3.5 kilowatts (5 hp) and 30 kilowatts (40 hp). When you bend a sheet of ply, alloy or steel around the chines and centreline of most boat shapes, you will induce some twist into the sheet. It is also often overlooked that one of the world’s top mega yacht builders are located in this rapidly developing market. In the United States, sailors tend to refer to smaller yachts as sailboats, while referring to the general sport of sailing as yachting. Most day sailing yachts do not have a cabin, as they are designed for hourly or daily use and not for overnight journeys. The huge range of such craft, from dozens of builders worldwide, makes it hard to give a single illustrative description. Larger vessels have in-board diesel engines of between 15 kilowatts (20 hp) and 75 kilowatts (101 hp) depending on size. Most of the twist is where the chines lead up toward the bow, which is why you notice the effect most there. The process of performing a conic development looks scary to a novice but gets earsier with practise. Within the limited context of sailboat racing, a yacht is any sailing vessel taking part in a race, regardless of size. Modern yachts have efficient sail-plans, most notably the Bermuda rig, that allow them to sail towards the wind.
The hull shape (or twin-keel layout) allows the boat to sit upright when there is no water. However, most favour a teardrop-planform hull, with a wide, flat bottom and deep single-fin keel to give good stability.
Dedicated offshore racing yachts sacrifice crew comfort for speed, having basic accommodation to reduce weight. In the common 7 metres (23 ft)-14 metres (46 ft) class, engines of 20 to 40 horsepower are the most common. Autocad makes it much simpler, as the origin points of the cones can be dragged around to find the best origin points.
Such boats are designed to undertake short journeys, rarely lasting more than 2 or 3 days (hence their name).
Most are single-masted Bermuda rigged sloops, with a single fore-sail of the jib or Genoa type and a single mainsail. Modern sailing yachts can be equipped with electric inboard motors in order to reduce consumption of fossil fuel. If you look at the frame sections superimposed on each other, as they are in the sections plan, then you will notice that the aft sections are more likely to be parallel and the front ones tend to fan apart.
Now all but the smallest, most basic yachts have electric lighting, radio, and navigation aids such as Global Positioning Systems. The latest technology are outboard electric pod drives that can also regenerate electricity (motogens). These types are often chosen as family vessels, especially those in the 26 to 40-feet (8 to 12 m) range.
Yachts around 10 metres (33 ft) bring in comforts such as hot water, pressurised water systems, and refrigerators. Clever use of ergonomics allows space in the saloon for a galley (kitchen), seating, and navigation equipment. This means that the auxiliary engine now also performs the vital function of powering an alternator to provide electrical power and to recharge the yacht’s batteries.
For yachts engaged on long-range cruising, wind, water and solar-powered generators can perform the same function. The smallest of this type, generally called pocket yachts or pocket cruisers, and trailer sailers can be transported on special trailers.

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