Page 752 - PPL-engelsk 2025
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Aircraft general knowledge
A good alternative is the diesel engine. The problem has been the weight.
Since a diesel engine works with a compression ratio of around 20:1, it must be
made robust in order to withstand the high pressure in the engine.
However, technology now makes it possible to manufacture diesel engines with
an acceptable weight.
The picture here shows a diesel engine.
The difference compared to the gasoline engine is
mainly that the 4 cylinders are in a row and not in
pairs opposite each other as in the boxer engine.
8.10.1.1 FADEC system
The diesel engine is strong and reliable. The engine has a FADEC system, which
controls the engine electronically if the engine fails, and then it maintains its
power up to 8000 feet, and the top altitude of the aircraft is more than 20,000
feet!
FADEC stands for Full Authory Digital Engine Control)
8.10.1.2 Engine cooling
The engine is liquid-cooled like a car. The air intakes at the front lead air to 2
radiators. It is important to ensure that there is the correct amount of liquid on
the radiator.
When the engine is cooled in this way, the risk of shock cooling is not present.
8.10.1.3 Diesel engine fuel
The fuel for the engine can either be traditional diesel from the tank or Jet A1
from the airfield.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 752
