[rebel-builders] float operations
Posted: Sun Feb 19, 2012 8:06 pm
Garry,
I don't think you can get the temperature below freezing because of evaporation. Even windchill is only a measure of an equivalent cooling rate, not an actual temperature (i.e the wind chill can be -5 C when the actual temperature is +2 C, water won't freeze). I believe that as long as you stay below the freezing level (see your GFA - icing, turbulence and freezing level) you will be OK. You are more likely to run into problems with your gear if you are operating off of a slushy surface, like a runway, and then climb into colder air. Slush canl build up in the wheel wells and can then freeze in the colder air aloft. The risk of lake water accumulating and freezing is a lot less ;).
Dave J
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I don't think you can get the temperature below freezing because of evaporation. Even windchill is only a measure of an equivalent cooling rate, not an actual temperature (i.e the wind chill can be -5 C when the actual temperature is +2 C, water won't freeze). I believe that as long as you stay below the freezing level (see your GFA - icing, turbulence and freezing level) you will be OK. You are more likely to run into problems with your gear if you are operating off of a slushy surface, like a runway, and then climb into colder air. Slush canl build up in the wheel wells and can then freeze in the colder air aloft. The risk of lake water accumulating and freezing is a lot less ;).
Dave J
Date: Mon, 25 Oct 2010 22:57:28 -0600
Subject: [rebel-builders] float operations
From: wright.garry30@gmail.com
To: rebel-builders@dcsol.com
Does anyone know at what temperature/densityaltitude/dewpoint combination
there is a risk of water from a lake freezing the gear on an amphib? Clearly
it will be higher than the freezing temperature of 0 deg C because of the
cooling effect of evaporation but ....??? Is there a rule of thumb saying no
water-ops below xx degrees C?
Garry
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