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.
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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).
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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 would be a good idea to do a little investigation on the company, too to determine what sort of technical support they provide, if any, and look at testimonials from past customers. It will also avoid being in the middle of a step and realizing that you don’t have what you need to finish your task.
If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. 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.
If they do not have a good follow-up background after the sale you may end up shuck without assistance. One more very important factor is to decide before you start where you will be constructing your boat. Autocad makes it much simpler, as the origin points of the cones can be dragged around to find the best origin points. If you have never worked with it before you probably want to try something basic to begin with, and maybe later work your way up.
Check the boat plans to see what the size will be at completion and then decide where you will have sufficient space. 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.



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