At 07:14 AM 19/12/2013, you wrote:
I have been using Shell 98 for 12 months since I purchased my Rotax
912S Ximango and have no clear fuel lines to look at; they are all
covered or aluminium. I have no fuel leaks and have metal
tanks. The aircraft manual specifies Avgas 100LL!
PeterS
So why not use Avgas 100LL? I'm pretty sure you are in breach of a
regulation by using 98.
I recently tested unleaded for ethanol from the local servo. No
ethanol but there seemed to be very high vapour pressure when shaking
with water in the measuring cylinder.
After that I'd be very wary of using it in the aircraft. One of the
really good octane improvers is ethanol so the easy way to make 95 or
98 is to add ethanol to ordinary unleaded. Other octane improvers are
nasty benzene based (aromatic) compounds.
With any fiberglass tanks (or rubber fuel bags) you need to be
especially careful. Mogas doesn't have a long shelf life while
retaining the original properties and forms gums which can cause
problems with carburettors.
Fiberglass tanks really need to be made from the right type of
vinylester resins and making them from kevlar is a really good idea
as it eggshells instead of fracturing and causing a fuel air
explosion in an accident. Also lighter.
Warning: there are very many types of vinylester resin. Check with
the vendor's chemist before selecting.
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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