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P. 671
Aircraft general knowledge
8.8.1.4 Volume ............................................................................................. 723
8.8.1.5 Compression ratio ................................................................................ 724
8.8.2 The aeroplane engine .............................................................................. 724
8.8.2.1 Cylinders…. ........................................................................................... 724
8.8.2.2 The structure of the engine…. ............................................................. 725
8.8.3 4-stroke principle ..................................................................................... 726
8.8.3.1 Engine operation…. .............................................................................. 727
8.8.3.2 Premature ignition and detonation…. ................................................. 728
8.9 The carburetor ............................................................................................. 729
8.9.1 Carburetor construction .......................................................................... 730
8.9.2 Carburetor ice .......................................................................................... 733
8.9.3 Carburetor heat ....................................................................................... 734
8.9.3.1 Operating the carburetor preheating…. .............................................. 735
8.9.3.2 Practical use of carburetor heat .......................................................... 736
8.9.4 Engine cooling .......................................................................................... 736
8.9.4.1 Engine cooling by oil and oil cooler…................................................... 736
8.9.4.2 Engine cooling by gasoline ................................................................... 737
8.9.4.3 Engine cooling by air… ......................................................................... 737
8.9.4.4 Air supply and alternative air supply.. ................................................. 737
8.9.4.5 Cowl flaps.. ........................................................................................... 738
8.9.5 Air-gasoline mixture ................................................................................. 739
8.9.5.1 Leaning…. ............................................................................................. 739
8.9.5.2 Using Mixture Control .......................................................................... 741
8.9.5.3 Fuel injection… ..................................................................................... 742
8.9.6 Engine lubrication .................................................................................... 742
8.9.6.1 Wet sump ............................................................................................. 742
8.9.6.2 Dry sump. ............................................................................................. 744
8.9.6.3 Oil..….. .................................................................................................. 744
8.9.6.4 Possible faults in the oil system ........................................................... 745
8.9.7 The ignition system .................................................................................. 745
8.9.7.1 Function of the ignition system ........................................................... 746
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 671
