At 01:44 PM 3/02/2015, you wrote:
This is sample of I think 3 layers of 125 glass
which was left in shell 98 for about 2 months.Â
 The glass is now soft and can be easily
twisted like say clear packaging.  It is a
bit sticky on surface. It seems it will never harden up again.
Thus under no circumstances would I use Shell or
Liberty 98 from say out of Brisbane in any aircraft with fibreglass tanks.
Jabiru web site say do not use shell 98 in any Jabiru but 95,and Avgas is OK.
Royal Dutch Shell sold out to another Dutch
company for retail of fuel in Australia and they
have the right to use the name Shell.
My next test is sample of Shell 98 and BP 98 as
well as Avgas. The Shell is a golden yellow
while BP is more neutral colour. Smell is different also.
If any body would like a mini movie of the
sample then ask. I would urge others down
south (Sydney, Vic & SA) to try their fuels.
Ian mcphee
Depends also on the resin. The right resin for
fuel tanks is vinylester. Consult the resin
company's chemist for the right vinylester resin
too. There are many different types, optimised for different purposes.
Kevlar is good tank material as the tank is less
likely to split open in an accident. Tanks can
also be sloshed with sealing compound which is fuel proof.
Bags wear, become brittle and leak, likely
exposing the structure around them to the fuel when this does happen.
Word around here from local RAAus guys is that
mogas of various types including 98 is of highly
variable quality, keeping properties etc.
From my experience of doing the ethanol test on
a small quantity of unleaded, it has very high vapor pressure.
I'll stick to Avgas in the BD-4 even though the
7:1 compression ratio engine (same as Super Cub)
can handle unleaded from an octane rating basis.
Mike
Borgelt Instruments - design & manufacture of
quality soaring instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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