ward.t(at)xtra.co.nz
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 Posted: Fri Aug 12, 2011 10:33 pm Post subject: AVGAS UL 91 is Rotax 912 specific: Map of where sold in Fra |
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Many thanks for the reply Remi, very informative.
Cheers,
Tim
Tim Ward
12 Waiwetu Street
Fendalton,
Christchurch, 8052
New Zealand.
ward.t(at)xtra.co.nz
Ph 64 3 3515166
Mob 0210640221
On 13/08/2011, at 4:43 AM, "Remi Guerner" <air.guerner(at)orange.fr> wrote:
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Hi Tim,
It is important to understand that AVGAS and MOGAS use two different scales for their octane number.
RON = Research Octane Number is used in Europe and some other countries for MOGAS.
MON= Motor Octane Number is used worldwide for AVGAS.
Here in France, unleaded Mogas 95 is 95 RON and 85 MON.
Unleaded Mogas 98 is 98 RON and 87 MON.
> From what you wrote, I assume this is the same in your country. Therefore, your Mogas 91 is probably 91 RON and about 81 MON.
On the other hand, AVGAS 100LL is 100 MON, and the new AVGAS UL91 we available in France is 91 MON.
ROTAX says the 912 needs 90 RON minimum, and the 912S and 914 need 95 RON minimum. So those flying behind a 80 HP 912 can almost use anything, but for the 912S and 914 do not use any Mogas below 95.
The new UL91 AVGAS is a very good news as it offers additional margin against detonation, no additives which can damage hoses, gaskets, etc and a better quality control. Unfortunately the price is about 20% higher than the best Mogas.
Regards
Remi Guerner
F-PGKL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=349262#349262
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