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Old 09-22-2021, 02:55 PM   #31 (permalink)
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My goal is to make a combination of alumnium + fiberglass.
I guess you already know some rally cars are fitted with an underbody tray made out of plywood. It might seem strange at first, but maybe it's worth to take a look at.

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Old 09-22-2021, 05:01 PM   #32 (permalink)
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I guess you already know some rally cars are fitted with an underbody tray made out of plywood. It might seem strange at first, but maybe it's worth to take a look at.
Rally cars drive for few days I need something that lasts for years... In my current region climate is pretty "wet" all the year (rains, snow). I don't believe plywood will survive.
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Old 09-23-2021, 03:05 AM   #33 (permalink)
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Rally cars drive for few days I need something that lasts for years... In my current region climate is pretty "wet" all the year (rains, snow). I don't believe plywood will survive.
No wonder marine-grade plywood is used for that purpose on rally cars, instead of the cheapest varieties.
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Old 09-23-2021, 05:40 AM   #34 (permalink)
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No wonder marine-grade plywood is used for that purpose on rally cars, instead of the cheapest varieties.
This is a good point, I was not thinking of that.
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Old 09-23-2021, 02:27 PM   #35 (permalink)
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Maybe it's worth trying, as it surprisingly has a reasonable proportion of resistence to the weight, justifying its use even in weight-sensitive applications such as racing cars and motorcycles.
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Old 09-23-2021, 06:01 PM   #36 (permalink)
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Even better is aviation plywood, which is certified to be immersed in water. Every good homebuilder puts their wing skins in the swimming pool for a week before they attach it to the wing.
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Old 09-23-2021, 06:32 PM   #37 (permalink)
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Even better is aviation plywood, which is certified to be immersed in water. Every good homebuilder puts their wing skins in the swimming pool for a week before they attach it to the wing.
As far as I understood, marine and aviation plywood are actually same material. Am I wrong?
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Old 09-24-2021, 12:26 AM   #38 (permalink)
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As far as I understood, marine and aviation plywood are actually same material. Am I wrong?
I didn't even know there was aviation-grade plywood, yet there are even some military specifications for it.
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Old 09-24-2021, 11:31 AM   #39 (permalink)
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Yup there is aviation plywood. Specs are different than marine, namely glues and assembly, no knots allowed, limited species selection........ pricey as all get out, I only know of one manufacturer, everyone went marine because it was more common and half the price and about ten times the orange box price for the junk they now sell. If you have a vintage tube and rag airplane, it's your only allowed choice for repair.
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Old 09-24-2021, 08:59 PM   #40 (permalink)
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If you have a vintage tube and rag airplane, it's your only allowed choice for repair.
For something subjected to less stringent regulations, marine-grade plywood might be OK to address concerns regarding environmental conditions.

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