Hi all,
Landing at Sywell last September for the LAA rally, I was surprised
they had both 100LL Avgas and 82UL Mogas. I decided to take 20 liters
of this -unknown to me- 82UL. This small quantity being mixed with
about 50 liters of the fuel remaining, I thought I was not taking a
big risk.
Later I did some research on the internet and among available
publications. This is what I found:
82UL has a MON (Motor Octane Number) of 82 and AKI (Anti Knock Index)
of 87, which translate into a RON (Research Octane Number) of 92, as
AKI=(RON+MON)/2.
In their Operator's Manuals and applicable SI, Rotax provides the
following instructions regarding the suitable fuels:
912 UL: minimum RON: 90 or minimum AKI: 87
912 ULS and 914UL: minimum RON: 95 or minimum AKI: 91
So it is clear that 82UL is not suitable for the 912 ULS and 914.
In order to confirm this conclusion, could anyone provide a detailed
specification of this 82UL Mogas as supplied in the UK?
Other questions: is there any ethanol in this fuel? Why they do not
supply Premium or Premium Plus / Super, whatever they call it, which
would offer the higher octane rating we need for the 912S and 914,
with only a slight cost increase?
Comments please!
Regards
Remi Guerner
F-PGKL
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