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dosmythe(at)cox.net
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 Posted: Thu Apr 26, 2007 8:07 am Post subject: Plastic/Poly tanks |
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Here's my concerns on Plastic/Poly tanks of any kind. I had my 2 stoke rotary valve tank crack, my 2 stroke oil injection tank crack (high density polyethylene). Non Kitfox related but, I had a new plastic shower stored in my attic for 2 years. Installed it and it fell apart on the first use (cracked). Had two brand new auto tires in the same attic. Gave them to a friend and they came apart the initial air up.
With all the above, I'm starting to get a real Leary feeling toward the word Plastic. Concerning wing tanks, I would be very very careful to have only White paint covering those wings. For my attic problems I tend to blame excessive heat. As some of you may remember, I had my 2" Poly tapes shrink on my wing tops. The paint color was Gray. I did a little extensive research with Poly Fiber on internal/external wing temps. I don't recall the numbers now but the temps inside a wing can easily go higher than the average temps in an attic. Any color other than White and the temps start to drastically increase.
Don Smythe
Classic IV w/582
Newport News, Va.
Do Not Archive
[quote][b]
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xfire
Joined: 23 Mar 2007
Posts: 16
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| Posted: Thu Apr 26, 2007 8:40 am Post subject: Re: Plastic/Poly tanks |
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I have 20 year old outboard motor tanks that have been exposed to the sun all year. they are a bit faded, but still pliable and fully functional. This is not "new" technology, but tested, tried and true plastics.
I too had the overflow bottle literally crumble in my hands) when I tried to remove it from the firewall (a sports type water bottle was used). One thing to think about is that I have seen lots of pics of plastic water bottles and such being used to oil and overflow tanks. these were not made to hold petroleum products, but as we are playing with experimental planes, we can put anything we want in them.
I have snowmachines that are 23 years old and the oil injection tanks and plastic expansion bottles are fine.
I think that alot of the products we use were not really designed for the application, but adapted over from another intended use. Steves tanks were developed and tested for a single particular use, and as such, I have no idea where all the concernes are coming from.
Just my .02 (that probably is not worth that much lol)
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