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Old 09-20-2009, 08:09 AM   #531
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Re: The Millicent Chronicles; two foot roof raise, big tailgate

The black would create more heat under the tarp. Lighter colors reflect the radiation back instead of absorbing it.

For shade, it's not so much the color that matters, it's the density of the tarp material that creates deeper shade. For example, the difference in shade quality between a sheet of white plastic (which will reflect the sun) and a white industrial tarp (which will block the sun) is substantial. Both are white, but one stops the sun's rays from completely penetrating to the other side, thus blocking more of the light.

However, in order to block both light AND heat, color does matter. In that case, two tarps of equal weight, but different colors (white vs. black) will produce the same quality of shade, but the white tarp will produce cooler shade because it will reflect the radiating heat as well as light.

Hope this helps.
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Old 09-20-2009, 10:55 AM   #532
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Re: The Millicent Chronicles; two foot roof raise, big tailgate


Thanks, Tygercub!
The tarp I have is a hay tarp, used by farmers to protect large stacks of hay. It is white on one side and black on the other, and no light gets thru. Quite a deal as tarps go -- 40 x 60 feet, with grommets and rope-reinforced edges, for just over USD 300.

But as I think I mentioned, such a large tarp is difficult to handle. They sell smaller hay tarps also.

Next year I expect to bring construction scaffolding to hold the tarp(s) up at the corners away from the bus, to eliminate the sagging you see in the above photo. I'm using scaffolding now in the construction of my barn, and that stuff is super handy! Lots of it at Burning Man, but I was not familiar with it until now.
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Old 10-09-2009, 01:29 PM   #533
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Re: The Millicent Chronicles; two foot roof raise, big tailgate

Quote:
Originally Posted by Elliot Naess


We noticed a substantial reduction in heat inside the bus -- compared with 2007 when we had the same tarp resting directly on the roof.
all of our tents over here in friendly Afghanistan have a similar set up. we also put a layer of sand bags on the conexes we use for offices it absorbs the heat during the day and bleeds it off during the night.

I was thinking that adding a deck on top of the bus would do something similar and allow additional storage space.
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Old 10-09-2009, 03:23 PM   #534
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Re: The Millicent Chronicles; two foot roof raise, big tailgate


Those sand bags serve as Thermal Mass. Well known principle.

Welcome back!
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Old 10-09-2009, 04:03 PM   #535
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Re: The Millicent Chronicles; two foot roof raise, big tailgate

Glad to be back. now I just got to wait a few more months till my my bus/burning man money comes out of the CD I have it in. and i'll be ready to get started.
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Old 11-30-2009, 03:07 PM   #536
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Re: The Millicent Chronicles; two foot roof raise, big tailgate


Time for an update -- I have done a bit of work on Millicent.



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...but I did not yet take any picture of that work on Millicent. Instead I took this shot in a 45-foot 2010 Prevost Marathon. They made me take my shoes off to go inside. Price tag: just barely north of Two Million US Dollars.

Meanwhile, back at the farm, Millicent has now traveled 18.421 miles in less than three years. Largely trouble free.

I learned something important about her last weekend: The tube that picks up the fuel inside the fuel tank is NOT at the rear of the tank where it ought to be. I say that's where it ought to be, because that's where the last of the fuel is while climbing a steep hill with the tank gauge close to the empty mark. Yep, I ran out. Would have gone another 100 miles or more on mostly level ground. But I forgot about that long 8 % grade just six miles from home. Big tow bill to get out of the traffic lane, and did not get the engine primed and started until the next day. I suspect the priming pump is no good. Wound up filling both filters manually and cranking the heck out of it -- with long cooling-off periods.

Lesson learned: Do not run your bus out of fuel. Never run it below quarter tank. You do NOT want to run a Diesel engine out of fuel.

Now, about my recent Millicent upgrade. The silly bus always smelled kind'a stinky inside while traveling -- exhaust and other engine fumes. So I took the bull by the horns and cut a big opening in the front sheet metal, above the right head light -- where the air intake is for the heater. Now we have 60 MPH air ramming straight into the interior(or thru the heater, depending on setting). Fresh air! Big improvement. We'll probably continue to tinker with that air flow and the heating thereof, but the main problem of sucky air inside has been solved. We have a "pressurized cabin" now.

I'll go out and take a snapshot of Millicent now...

...Here we go:



Probably ought to put a screen on it, to keep low-flying birds and random pedestrians out of it. But boy howdy, lemm'e tell you, it works!
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Old 11-30-2009, 07:58 PM   #537
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Re: The Millicent Chronicles; two foot roof raise, big tailgate

Question for you: if you have 60mph wind coming into the bus through that hole, won't you also have 60mph rain coming in? My bus has a stock vent built in on the driver side (the one on the passanger side has a plate covering it) and I wonder, what prevents the rain from coming right in? I've spent enough time grinding rust off the floor now that I want to prevent that from recurring.
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Old 11-30-2009, 09:57 PM   #538
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Re: The Millicent Chronicles; two foot roof raise, big tailgate


No doubt some extra rain will get in. Perhaps I ought to put a door or cover on it.

But we are not talking about a new path straight into the bus. I should have explained better. What I created was an easier way for air to reach the normal heater/ventilation intake. Look at the picture and you will see a screen a couple of inches behind the new hole. That's the existing heat/vent intake. It has a door already, controlled by cable from the dashboard, allowing a choice between outside or inside air.

So it is not like I have stuck a giant funnel in the face of the bus. The air flow still has to pass thru the normal vent/heat system.

But yes, no doubt the original convoluted air path (upward in the area behind the headlight) was designed to keep rain from getting to the inlet.

Everything in life is about choices and compromises. I figure I'll be long dead of Old Age before that occational extra water causes any appreciable rust. But the air quality while driving was an urgent matter on every trip. I did not notice it myself, but one or two of my frequent companions were bothered by it, so I Took Care Of It.

And if any serious gullywasher ever comes thru there, it will just run down the stairs and out the door anyway.
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Old 12-01-2009, 01:21 AM   #539
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Re: The Millicent Chronicles; two foot roof raise, big tailgate

I saw the coach interior and was thinking, "He put ROLLOUTS in????"

I like the Ram-air ventilation system. Did you ever see the bus drag racing videos where they cut flaps in the bus roof to cut drag as they were doing wheelies down the race track? (hint, hint)
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Old 12-01-2009, 11:39 AM   #540
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Re: The Millicent Chronicles; two foot roof raise, big tailgate


I suppose I should have saved that Prevost picture for April Fools Day, but I would have lost it by then.

Air flow is a tricky science. And I'm no scientist! But I have a rough idea where the low-pressure and high-pressure areas are on the outside of a vehicle. These seem to tend to conspire to create a rear-to-front air flow inside the vehicle.

The worst thing we could do was open the driver's side window. That would draw air out of the front of the bus, and the replacement air would come from the rear -- where the tailpipe is, and a gazillion small holes and gaps in the body. We also have a huge air leak around the unfinished entry door, contributing to the problem. So we needed to bring in lots of air in the front, reversing the general air flow inside to run from the front to the rear. The ram air hole does a good job of that.
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