Off point, but I am amazed that with servo fuel the expression ‘unleaded’ is
still used and leaded has not been around for years.
Why not just 91, 95 & 98 octane petrol/fuel?
From: Laurie Hoffman
Sent: Tuesday, February 03, 2015 5:34 PM
To: Discussion of issues relating to Soaring in Australia.
Subject: Re: [Aus-soaring] Shell 98 and fibreglass
The last point by John is something that I have been thinking about lately.
With almost all (all?) PULP now being imported I would expect greater time lags
between production and supply at the pump.
We have posted before about our fascinating experiences with varying petrol
brands particularly in relation to loss of octane rating over surprisingly
short periods of time (<14 days).
Shipping from Singapore surely must maker older before use.
Due to its MSDS advice that BP has a shelf life of 12 months we only ever use
BP98 with almost no problems.
More recently we did however have an issue where some detonation occurred and
fresh 98 rectified it. The bad 98 was only stored for a couple of weeks.
Regards
Laurie Hoffman
--------------------------------------------------------------------------------
From: "[email protected]" <[email protected]>
To: Discussion of issues relating to Soaring in Australia.
<[email protected]>
Sent: Tuesday, 3 February 2015, 17:05
Subject: Re: [Aus-soaring] Shell 98 and fibreglass
Most (all?) oil companies will tell you that mogas is not approved for aviation
use. There are a number of reasons for this but one is the much greater
compositional variability of mogas compared with avgas. This has little to do
with additives, which are used at very low treat rates, but rather the
composition of the fuel itself.
As for testing fuel in Sydney, you could, but by the time you get any results
they will be meaningless because a number of batches of fuel from various
offshore refineries will have passed through the distribution system in the
mean time. All it would tell you is the effect on resin of the fuel which
happened to be in the service station tanks 3 months ago.
...John
From: Future Aviation Pty. Ltd.
Sent: Tuesday, February 03, 2015 3:16 PM
To: Discussion of issues relating to Soaring in Australia.
Subject: Re: [Aus-soaring] Shell 98 and fibreglass
Hi Ian
Many thanks for sharing that with us.
It confirms what Gerhard Waibel told me about 15 years ago. He said that fuel
bladders are
preferable to wing tanks "because you never know what additives get added to
the fuel in
future and what they do to the resins used in those wing tanks”.
Fuel bladders are easy to replace, but wing tanks …..
Kind regards to all!
Bernard
On 3 Feb 2015, at 2:14 pm, Ian Mc Phee <[email protected]> wrote:
This is sample of I think 3 layers of 125 glass which was left in shell 98
for about 2 months. 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
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