William,
I asked Roger about this yesterday (on his almost last day) because the
factory built my cockpit module and bonded in the tank as per the
instructions. His comforting words were that the shear stress issues were
being experienced by extreme temperature ranges and would not cause problems
for "normal" (ie UK and mainland western Europe) temperatures.....
Not sure how much that helps for your circumstances...
RCC
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of William Daniell
Sent: 23 December 2009 13:05
Subject: Re: Europa-List: Re: Fuel tank installation without bonding it in
Jan
is there any suggestion for those of us who have already bonded in as per
the manual?
...And to take the opportunity also to say Happy Christmas to all and thanks
for all the help in 2009.
Will
Jan de Jong wrote:
> 2.
> The gaseous tank treatment introduced to prevent swelling causes epoxy
> to bond to the tank material.
> Thermal expansion rate difference is the most likely cause for tearing
> tanks.
> Prescription:
> Install in accordance with the manual but with a permanent release
> film between layup and tank.
> No other measures are necessary and triboelectrics are not an issue.
>
> (
> Googling gives a linear thermal expansion coefficient difference
> between glass reinforced epoxy and polyethylene in the order of 1 in
> 10000 per degree C.
> That would be 1 mm per 20 cm for 50 degree C.
> )
>
> Cheers,
> Jan de Jong
>
>
> _
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