Hi Frans, Just for interest - the UK LAA's website contains some useful info on
Mogas and the LAA requirements. It's under the tab "LAA aircraft" and sub tab
"Mogas". There's general requirements for all LAA aircraft (that wish to use
Mogas) plus some specific requirements for particular types, ie Rotaxes, Europas
etc. Amongst other things, each individual aircraft has to be approved,
placcarded
and signed off by an inspector to use Mogas, we have to have fuel return
lines, fuel drains etc etc..
There is a lot of emphasis on the volatility of Mogas compared to Avgas and we
must only use BS EN228 95 RON and the mandatory operating limitations are
specified
as a maximum altitude of 6000 feet and a maximum fuel temperature of 20
deg C.
I have only experienced one episode of vapour locking on my Europa (912ULS).
In the UK it seems to be impossible now to obtain ethanol-free mogas (we are not
approved to use it if it does contain ethanol). My local garage sells the higher
octane "excellium" grade (98 RON) which I tested to be ethanol free. My
completely uneducated thinking at the time said - sounds good stuff - that will
be great! I did not know at the time that this fuel is also completely not
authorised for use as Mogas due to its (even) higher volatility, according to
the LAA notes. I used it 3 or 4 times with no probs until one day, after a long
taxy back through long grass where the engine got quite warm I tried to start
it again after a few minutes and it just would not fire at all. After a few
attempts there was a very strong smell of fuel and I could hear it boiling.
So I left it for a couple of hours with the cowl off and later it bust into
life at the first go!
Now I try to use the new 91UL where possible.
Cheers,
--------
G-TERN
Classic Mono
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