Author: robhickman@... Time: Thu Dec 16, 2004 12:02 pm PST Link
Here is a better answer to the ice question of last week:
Normally ice is a leading edge situation (first 7% of chord). Aircraft with
deice or anti ice protection only need to deal with the first 7% of the
chord because beyond that point the moisture never has an opportunity to strike
the wing. Getting Ice beyond 7% just does not happen. However you may recall
a commuter aircraft that got ice just ahead of the aileron and lost control.
That was an issue of the ice collecting just forward of the aileron due to
the gap and could be considered leading edge aileron ice that formed on the
main wing just forward of the aileron leading edge. So yes, if you were to
get ice aft of 7% you are in big trouble but this is very unlikely. Typically
ice forms on the first 2% of the airfoil with clear icing back as far as 7%,
thus the reason boots and heated leading edges are protecting only the first
7% of the wing.
On the ground however, ice can form all over the wing and airfoil. But FARs
prohibit taking off with ice adhering to the aircraft.
The upper port needs to be protected and checked before flight if there is
any chance it can get plugged. You should check the water trap before each
flight just to be safe.
I have never had water in my RV-4 upper ports in 3 years even after I wash
the plane.
Sincerely,
Rob Hickman
Advanced Flight Systems
_Rob@Advanced-Flight-Systems.com_ (mailto:Rob@Advanced-Flight-Systems.com)
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