Straightening Plywood - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-21-2006, 01:42 PM   #1
Bryan Mailloux
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Straightening Plywood

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I am building a plane with some 1/8 aircraft plywood ribs. The question is when I got the sheet of wood it is warped and crooked. is there an easy way to get them straighter. I have already cut the ribs,it is not as bad as looking at the full sheet.
Any ideas?
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Old 01-21-2006, 03:32 PM   #2
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Steam it and weight it down for a couple of days?

It's funny because I've got some flat plywood that I want to bend. It's bigger than ribs (about 12"x8"--to be used as a replacement back for a small chair) but the principle should be the same.
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Old 01-21-2006, 06:12 PM   #3
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Be careful with the heat here, light ply is made with heat to bond it, that is why it warps in the first place. Too much heat will melt the glue used to hold it together and it could delaminate. Try this as an option. You will need 70% rubbing alcohol and some screening material. First get the ply fairly wet with alcohol and let it soak in for a minute or so. Second, place 2 layers of screen on a flat surface, put the part on it and then put a nother 2 layers of screen on top of the part making a sandwich out of it. Now make sure the high part of the warp is off the table with the 2 ends on the table and put enough weight on it to hold it down flat and leave it over night, the warp should be gone in the morning or after a good 8 hours. This method also works for balsa that has warped or if you want to wrap it around something like a turtle deck without it cracking. The alcohol leaves no after marks like water and evaporates quickly without damaging the wood.
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