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Old 10-15-2015, 12:16 PM   #15
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Originally Posted by CRH View Post
How does wind come into play?
Please forgive the inexact science to come --

As paiceman said earlier, wind is normally associated with the Wind Chill Factor. The reason wind is relevant is that, for both human skin and trailers, wind causes heat to leave the warmer object (human skin, trailer pipes) at a faster rate than in still air. In 30 degree air all objects will eventually get to 30, no matter what temp they started out at. With a wind blowing on them, they will get to 30 more quickly, that's all. Change the air temp to 10 Fahrenheit , and the accelerated cooling can be profound in a strong wind, to which our facial skin can attest! [apologies to Winston Churchill . . . ]

I forget the physics of it, but the differential between the air temp and object temp also affects the rate at which heat leaves the object.

Then there is the other affect of wind, also mentioned earlier, that it can force cold air through gaps and holes, and drive the cold into the coach's innards and pipes, which are no longer protected in an airtight cocoon. In a strong wind, the blast of air leaving a pinhole air leak actually is cooler than the air that entered the pinhole, if only by a small amount. [like the air leaving a tire valve as it drops in pressure]

The net conclusion is that wind can escalate the affect of cold air in unexpected ways.

Thus endeth this imprecise windy matter . . .

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Old 10-15-2015, 12:34 PM   #16
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Originally Posted by OTRA15 View Post
Please forgive the inexact science to come
Inexact, but certainly close enough for Government work. I used to work for the Government, so I should know. Building on what you said…

Wind chill only affects things with a warm-blooded metabolism, meaning they generate their own heat. That includes a trailer while you're camping in it and have the furnace on. It does not include a winterized trailer that is stored with the furnace off.

Here's an example that I think clearly illustrates the effect of wind chill. Looking at the National Weather Service's wind chill chart, if the outside temperature is 35F— above freezing— and there was a 20mph wind, the wind chill is 24F, below freezing. So would your plumbing freeze? No. Regardless of the wind chill, 35F is still above freezing and your pipes will not freeze.

So where does wind chill make a difference? If you were going camping instead of winterizing, the amount of propane you would use to keep the trailer warm with an outside temperature of 35F with a 20mph wind would be the same as if the temperature was 24F with no wind.

Living along the Gulf Coast as I do, the case where the temperature is above freezing but the wind chill is below freezing happens on a semi-regular basis in most winters, which is why I use it as my example.

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Old 10-15-2015, 12:38 PM   #17
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I prefer not to take any chances! We don't normally do any camping after mid September until we head south early in the new year, so as soon as we take that last September trip, I winterize - then I don't have to watch the weather and worry - as I otherwise would!

Likewise, when we return from our winter trip, I generally winterize it again as we could still get a cold snap in April where we live. Probably not cold enough and long enough to do harm, but I worry a lot!

Probably no need for me to do that really, but for a couple of gallons of antifreeze and half an hours work, it is worth it for me just for peace of mind - especially since our trailer is stored about a half hour further north from where we live!


Having said that I would be pretty sure that if the temp dips to 30F just for a couple f hours overnight, you "Should" have no worries!

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Old 10-15-2015, 12:55 PM   #18
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Thanks for the nice illustration, Protagonist . . . well said.
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Old 10-15-2015, 01:41 PM   #19
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Personnally if there is any concern on the temp dropping below freezing why take the chance. $20 for a few gallons of RV Antifreeze pumped throughout the plumbing system seems like cheap insurance to me. Or better yet just blow out the lines with compressed air. Like paiceman, I did both this past weekend.
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Old 10-15-2015, 01:52 PM   #20
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I like to winterized my trailer while it is nice outside,like 50 degrees, I have done it at 20 degrees and snowing with a wind , didn't like that very much...
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Old 10-15-2015, 07:46 PM   #21
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I'm with Wingeezer. We winterize right after the last trip of the summer usually. I was a little later this year but winterized 2 weekends ago. With the original lines from 1979, I don't want to take any chances. I wish I had replaced the water lines when I had the inside stripped. In the last 8 years, I have had 3 years with leaking lines in the Spring that I had to patch/replace. The first was the Aqua V sprayer that I didn't think about the first winter.
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Old 10-15-2015, 09:30 PM   #22
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Wind increases the rate of conductive heat loss, so if the temp is below freezing, the chance of freeze damage increases. Wind also allows air movement through many types of insulation.
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Old 10-15-2015, 09:33 PM   #23
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On our trip home from the dealer in Oct. 2013 we winterized at -10F in Dawson Creek, BC after un-seasonable cold spell hit. Don't recommend that 😀but all was fine in the spring.
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Old 10-16-2015, 07:11 AM   #24
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I live in Newport, PA and I have winterized.. nicer to do when not freezing don't forget the two little low point drains.

better safe than sorry

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Old 10-16-2015, 08:00 AM   #25
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We're in Toronto, here, and the typical time for winterizing seems to be just after Canadian thanksgiving (which was last weekend)

We brought the trailer into the city the weekend before & did a wash / wax on everything, plus any other little repairs/ maintenance we identified (hinges, locks, etc).

Took her out for the last trip of the year for us, and did final winterizing on site. Blew out the lines best we could (our larger portable air compressor needs a repair on its switch, unfortunately, and the one we brought just didn't have the tank capacity to blow out as much as we would have liked), then hooked a bypass right up to the water pump & put a couple of gallons of antifreeze through everything, dumping the remainder in the traps and on top of the toilet mechanism.

All in all it went fine, but I guess spring will be the test of our success.

Sad to see the end of our first season. Managed to squeeze in four long weekends between buying it mid-August and putting it away last weekend, and towed just over 1000km. I'm already starting to rough out what plans 2016 will hold, including our first longer trips.....
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Old 10-16-2015, 08:01 AM   #26
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Also, glad we did it last weekend! We're forecasting a cold snap this weekend. Just over freezing tonight, with tomorrow night's forecast dropping below freezing. First snowfall this weekend, potentially
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Old 10-16-2015, 10:39 AM   #27
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A meteorological degree earned years ago - Wind Chill is only a measurement of the effect of wind on human skin. All other statements in this thread, however, do have relevance and should be considered. But as far as temperature is concerned if it's 32* F outside it's 32*F regardless of wind velocity, except on human exposed skin.

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Old 10-18-2015, 07:46 PM   #28
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Originally Posted by EarlM View Post
I live in Newport, PA and I have winterized.. nicer to do when not freezing don't forget the two little low point drains.

better safe than sorry

I'm curious how the low point drains work. Mine look like a couple of tubes coming out of the pan. No visible valve. Thanks


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