Martin wrote:

Hi group !!

I have a question that's not rely of "rotary type".

Aviation fuel comes in grades like 91 / 96 UL or 100 / 118 LL.

Can somebody clarify these numbers. I understand that it is the octane

rating, but

why two numbers ??

Best regards !
Martin

Flat Out - Fast and Loud !!

"Webre, Steven P." wrote:

Basically, octane ratings at lean and rich settings.

Steve Webre
Broussard, LA

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