There are a few anti-fog sprays that will reduce condensation on the inside of viewports. Just check with the manufacturer to make sure they are safe for acrylic (rain-x is not safe though). Condensation also forms faster on windows that are dirty. Cleaning and waxing with wax for aircraft acrylic helps a lot. Frank D. is right about scratches- acrylic is very notch sensitive under pressure.
As far as heat goes, I’ve found that the conning tower on my sub gets very hot in the summer even when the rest of the sub is cool. The steel hatch gets very hot. Shading the upper parts with a sail really helps. When using an acrylic dome it’s always a race to get underwater because it feels like your head is under a magnifying glass. A fan blowing cool air up helps too.
Greg
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The moisture problem has me concerned. I agree with you Frank that wiping the view ports is a bad idea. But I also think that your heater will not remove any moisture just suspend it a bit, as you keep adding moisture from breathing it will continue to fog.
A while ago I was thinking on stickin some alum heat sinks on the hull with a catch pan. With my cold water it should cause the condensation to form and harmlessly drip into a bucket. If this works, was thinking on doing em in front of my scrubber, using it's fan and drying the air some before it goes in.
Small fans on the view ports would help also.
Such fun all these unkowns.
Dean
In a message dated 3/14/2009 4:35:21 P.M. Central Daylight Time, ShellyDalg@aol.com writes:
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