This ice formation, which is less dense then glaze ice, is an opaque, rough deposit. At ground level it forms in freezing fog and consists of a deposit of ice on the windward side of exposed objects. Rime is light and porous and results from the small water drops freezing as individual particles, with little or no spreading. A large amount of air is trapped between the particles.
Aircraft in flight may experience rime icing when flying through clouds with the air temperature and the temperature of the airframe below freezing point; the icing builds up on the leading edge, but does not extend back along the chord. Ice of this type usually has no great weight, but the danger of rime is that it will interfere with the airflow over wings, etc., and may choke the orifices of the carburetor, air intake and flying instruments. Glaze Ice or Clear Ice
Glaze ice is the glassy deposit that forms over the village pond after a frosty night. On aircraft in flight, glaze ice forms when the
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The icing of the aircraft in such conditions, however, is primarily due to water drops, though snow may subsequently be embedded in the ice so formed.
Negative Effects of Icing on Aircrafts
It is evident that if ice continues to be deposited on the aircraft, one or more of the following effects may occur:
• Decrease in lift. This may occur due to change in wing section, resulting in loss of streamlined flow around the leading edge and top surfaces.
• Increase in drag. Drag will increase due to the rough surface, especially if the formation is rime. This condition results in a greatly increased surface friction.
• Decrease in propeller Efficiency. With turbo-prop and piston engines, the efficiency of the propeller will decrease due to alteration of the blade profile and increased blade