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Aircraft general knowledge
8.5 Aviation fuel
(Generel viden om luftfartøjer 2 - 6 videoer)
Most of our small aircraft fly on gasoline. Some, especially the newer ones, fly
on diesel. The aircraft of the future may fly on electricity.
8.5.1 Aviation gasoline
There is extensive quality control of aviation gasoline. The gasoline companies
ensure the quality of the gasoline, right up until it is filled in the tank.
Gasoline is leaded to reduce knocking. The gasoline's knocking resistance is
indicated by the so-called octane number or performance number.
8.5.1.1 Types of gasoline
Aviation gasoline is divided into classes with regard to:
- octane number
- grade
Gasoline is leaded to reduce knocking. The knocking resistance of gasoline is
indicated by the so-called octane number or performance number.
TEL (Tetra Ethyl Lead) is used to prevent knocking in engines and to lubricate, for
example, valve seats. 1g contains 640 mg of lead.
Gasoline can also be classified according to the grade system. It is indicated with
two or three numbers, for example from 80 to 87.
We use avgas 100LL with an octane number of 100 and low lead content for most
aircraft. Today, 100LL is used all over the world.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 701
