Originally Posted by
Contract Con
I believe the speed is not a huge factor, unless you do fly fast enough to increase the TAT to above freezing.
Speed
is a huge factor, because in the important cases you
do fly fast enough to increase the TAT to above freezing.
The worst icing conditions occur with high concentrations of supercooled water, and that occurs with SATs just below zero. Increasing TAT by 5 degC above SAT helps. Increasing TAT by 10 degC above SAT helps lots. Increasing TAT by 20 degC above SAT pretty much eliminates ice.
Figure in the quadratic dependence of TAT rise on speed (1% higher speed => 2 % more TAT rise etc.) and speed becomes a very important factor.