Deicing
Systems: GENERAL
As said in week 1, deicing systems remove the ice after it has formed,
by the use of pneumatic deicer boots on the leading edges of wings and tails.
Propeller deicing uses heating elements that are cycled to melt the accumulated
ice and allow it to be removed by centrifugal force.
We have
just noticed that an anti-icing system prevents the formation of ice on the
protected component, but it has been found that for keeping the wings and tail
surfaces of some of the slower airplanes free of ice, it is more effective to
allow the ice to form on the surface and then crack it so the airflow over the
surface will carry the ice away. This is more effective than melting the ice on
the leading edge, because when this is done, the water flows back to an
unheated portion of the surface and re-freezes, forming a ridge that becomes an
effective aerodynamic spoiler.
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