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building a boat from cardboard
I got myself singed up for a cardboard boat race this saturday. We
are given two sheets of 5x8 card board, duct tape and plastic sheeting. I was thinking of building a canoe style, but was worried about the boat folding in half. I know plywood has alot more stability than card board, and was wondering if anyone has had expirence in this area, or could point me to a web site that might offer help. I don't know how big the plastic sheeting is, which is a problem. I don't know how long the boat could be. I was thinking along the lines of a D4, or a 12' canoe, but made a bit wider for stability. Playing around in the hulls program (great program!) shows me that for one person, displacement isn't as much of a concern. My main concern is of the plywood folding around me when I sit in it. Any hints? The race is Saturday. email: dallyn_spam at yahoo dot com please respond in this NG so others can share your wisdom as well! |
"Dave Allyn" wrote in message ... I got myself singed up for a cardboard boat race this saturday. We The race is Saturday The cardboard boats I have seen were usually covered in layer after layer of spray paint, are you allowed to use any ? |
On Fri, 2 Sep 2005 06:43:07 -0500, "Phil" wrote:
"Dave Allyn" wrote in message .. . I got myself singed up for a cardboard boat race this saturday. We The race is Saturday The cardboard boats I have seen were usually covered in layer after layer of spray paint, are you allowed to use any ? No. They have to be built on site, and the only things you can bring is stuff to decorate your boat, but no spray paint. email: dallyn_spam at yahoo dot com please respond in this NG so others can share your wisdom as well! |
Think triangles. Strips of cardboard folded into three sided tubes are
quite strong. Use for chine logs, sheer clamps, and thwarts. Get one of the gadgets that put the rubber retaining strips back into a screen door. You can crease and fold across the corrugations where needed without cutting the paper. Duct tape! Bathing suit. Roger http://home.earthlink.net/~derbyrm "Dave Allyn" wrote in message ... I got myself singed up for a cardboard boat race this saturday. We are given two sheets of 5x8 card board, duct tape and plastic sheeting. I was thinking of building a canoe style, but was worried about the boat folding in half. I know plywood has alot more stability than card board, and was wondering if anyone has had expirence in this area, or could point me to a web site that might offer help. I don't know how big the plastic sheeting is, which is a problem. I don't know how long the boat could be. I was thinking along the lines of a D4, or a 12' canoe, but made a bit wider for stability. Playing around in the hulls program (great program!) shows me that for one person, displacement isn't as much of a concern. My main concern is of the plywood folding around me when I sit in it. Any hints? The race is Saturday. email: dallyn_spam at yahoo dot com please respond in this NG so others can share your wisdom as well! |
Yes, yes. Can support with stringers running the lenth of the boat, either triangular cross section as suggested, or at right angles like an I-beam. Also frames accross boat to retain shape. But remember, the fewer pieces there are, the faster and easier it will be to build. For example, if bottom is V-shaped or W-shaped instead of flat you get quick and easy support from folds without cutting. Long and narrow is faster than short and fat. Minimize two kinds of drag: a) amount of surface friction with water, b) amount of waves made (that's where long and narrow comes in). Turn boat over, tape plastic to outside to waterproof. -- ------------------------------------------------------------------------------ William R Watt National Capital FreeNet Ottawa's free community network homepage: www.ncf.ca/~ag384/top.htm warning: non-FreeNet email must have "notspam" in subject or it's returned |
William R. Watt ) writes: Yes, yes. Can support with stringers running the lenth of the boat, either triangular cross section as suggested, or at right angles like an I-beam. I forgot about gunwales and side decks. Fold over along top of side. The triangle idea sounds good here. Be sure to let us know if we win. -- ------------------------------------------------------------------------------ William R Watt National Capital FreeNet Ottawa's free community network homepage: www.ncf.ca/~ag384/top.htm warning: non-FreeNet email must have "notspam" in subject or it's returned |
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On Fri, 02 Sep 2005 12:58:13 GMT, "Roger Derby"
wrote: Think triangles. Strips of cardboard folded into three sided tubes are quite strong. Use for chine logs, sheer clamps, and thwarts. I figured a triangle along each of the sides (top and bottom if I have enough) as well as three horizontal stabilizers should help considerablly with the over all stability of the boat. See my other post as well. I ranted there about canoe vs single sheet etc.... Get one of the gadgets that put the rubber retaining strips back into a screen door. You can crease and fold across the corrugations where needed without cutting the paper. Great Idea. Thanks. I'll stop on the way there and get one! Duct tape! Provided, and can be the only type of adhisive etc... Bathing suit. :) but if I build it correctly, I shouldn't get wet right? :) Roger http://home.earthlink.net/~derbyrm "Dave Allyn" wrote in message .. . I got myself singed up for a cardboard boat race this saturday. We are given two sheets of 5x8 card board, duct tape and plastic sheeting. I was thinking of building a canoe style, but was worried about the boat folding in half. I know plywood has alot more stability than card board, and was wondering if anyone has had expirence in this area, or could point me to a web site that might offer help. I don't know how big the plastic sheeting is, which is a problem. I don't know how long the boat could be. I was thinking along the lines of a D4, or a 12' canoe, but made a bit wider for stability. Playing around in the hulls program (great program!) shows me that for one person, displacement isn't as much of a concern. My main concern is of the plywood folding around me when I sit in it. Any hints? The race is Saturday. email: dallyn_spam at yahoo dot com please respond in this NG so others can share your wisdom as well! email: dallyn_spam at yahoo dot com please respond in this NG so others can share your wisdom as well! |
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Ah.. the plot thickens. I asked the lady in charge how long the
plastic is. She then asked me why? how big of a boat are you biulding? I said "Probably 12-14 feet long" She smirked. "You know the cardboard is only 8 feet long, right?" "Sure. Thats bigger than plywood, but I know people that have built 30' boats with 8 foot sheets of plywood. There is even a guy who made a 19' canoe from only one 4x8 sheet! "huh. well, you are going to want to triple the cardboard up anyway to hold your wieght. "I'm sorry, but the displacement is what will hold up my weight. I just need to engineer the boat not to colapse. that's why I need to know how big the plastic is. "I don't know. I havn't cut it yet. Probably about 10 feet long." There goes my 14' canoe!!!! back to the drawing board. I chopped the back 4 feet off the canoe, made it into a "V-hull" and widened it out a bit. Hulls gives me a water depth of 5.6" and a swamp depth of 11.2" that gives me a freeboard of 5.6", and that should be enough. Cardboard can be doubled up on the floor, and set at an angle against the V-Hull for added strength. Thinking this out again now, 10' of plastic won't be able to come up the sides very well on the ends. let me do some more thinking. thanks dave email: dallyn_spam at yahoo dot com please respond in this NG so others can share your wisdom as well! |
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