| lr172 |
11-30-2018 08:47 PM |
Quote:
Originally Posted by rvdave
(Post 1305788)
Yesterday while flying in northern Michigan marginal vfr conditions below the clouds and freezing temps I was picking up freezing moisture on the windscreen. Although I have defrost fans on the glare shield it wasn’t enough heat to take away or disperse buildup so landed right away with no factor.
Has anyone ducted air from floor heat to optionally divert warm air to defrost fans? I’m thinking of adding somehow a coupling and scat to floor heat outlet and a way to switch between the two. Any ideas?
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Was this typical condensation on the inside of the windshield or on the outside? Icing comes from liquid moisture hitting the plane and then freezing. This requires "visible moisture,"such as in clouds, fog or rain. The air always includes moisture in a gaseous state (at least down to a temp below 0) , however, this gaseous moisture mixed with air will not cause icing. It is only an icing problem when the air is fully saturated with moisture and the remainder stays in liquid form and creates clouds or fog. What makes a cloud visible is the suspended water or ice particles in a liquid or solid state.
I am not the most experienced guy, however, I have flown MANY hours at freezing temps. I have never seen icing form without visible moisture and this is backed up by all of the educational material in the IFR world. The only way that moisture converts from a gas to a liquid is through condensation. As long as your airframe is the same temp as the air, it can't cause condensation.
Larry
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