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A covering placed around an engine. Often manufactured from glass fibre for model aircraft applications.
Note that cowlings tend to reduce the area over which the propeller is effective and can severely reduce engine cooling. To improve cooling make sure that the air inlet and outlet areas are large enough. Also you can make sure that the outlet is in a low pressure region to assist with the air throughput.
A 20cc four-stroke installed in a close fitting cowl.
The main cooling holes are quite limited in this stand-off scale Mudry CAP. The central hole is designed to clear the propeller hub and will be blanked off by the spinner once assembled.
Note the extra hole that gives direct cooling for the cylinder head and the air exit point at the rear lower edge of the cowl that flows air over the exhaust silencer before exiting.
The air outlet sits in a low pressure area at the back of the cowl, this will help draw air through the cowling.