The main concern was providing cooling air over the cylinder heads, which generally required a very large opening at the front of the aircraft.

The new high pressure turbine uses new materials and a new way of delivering cooling air to the blades.

The high pressure system diverts the jet stream, with its cooling air, into northern Canada.

Convection cooling It works by passing cooling air through passages internal to the blade.

This cooling air comes from air compressor.

On the farther side of the clearing, a hot spring bubbled from underground and filled the cooling air with steam.

This cooling air, after being utilized, was ducted toward the rear of the nacelle, to provide additional net thrust.

The sky was darkening, and some night-blooming flower spiced the cooling air.

This cooling air also tended to blow away any pieces of unburned paper from the cartridge that happened to be near the barrel.

The engine radiator was fitted in the back wall of the cab, drawing cooling air from a duct behind the right hand cab door.