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Old 05-16-2011, 09:34 PM   #11 (permalink)
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Maybe like the old Peterbilt 372?

http://farm5.static.flickr.com/4067/...42547098_z.jpg

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Old 05-16-2011, 09:37 PM   #12 (permalink)
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Wow... why don't trucks look like that anymore?


Also...
Aerodynamics Research Revolutionizes Truck Design
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Old 05-16-2011, 09:42 PM   #13 (permalink)
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Welcome to EM!

Yes the back end makes more of a difference then the front end.
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Old 05-16-2011, 09:43 PM   #14 (permalink)
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In the case of the 372, it didn't sell well enough, albeit PACCAR didn't push hard on promoting it, especially since diesel was still dirt cheap when it came out. The traditional longnose conventional was what all the gearjammers wanted. And to think it was the first Class 8 to get 10 mpg loaded with a van trailer.

The ones that are left are getting bought up quick by those who know about them.
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Old 05-17-2011, 07:58 AM   #15 (permalink)
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A boattail will give you a big increase in fuel efficiency, but to do it right, you will need a long boattail, increasing the total length of your vehicle. Do you have an idea of how much longer you are willing to make your vehicle?

There may be some less lengthy options...
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Old 05-17-2011, 08:26 AM   #16 (permalink)
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Or make a boattail trailer?
Ala Aerohead.
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Old 05-17-2011, 10:24 AM   #17 (permalink)
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Originally Posted by metroschultz View Post
Or make a boattail trailer?
Ala Aerohead.
Hey that is a brilliant Idea for this guy!
How about a boat tail trailer with some articulating gap fairings, inside is his favorite car? Maybe road bikes? That would really rock.
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Old 05-17-2011, 10:39 AM   #18 (permalink)
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The windshield is an issue. A big expensive issue. I plan to build the nose of the front fairing to partially cover the huge windshield. It would cover the lover 12 inches of the windshield. This would change the pressure distribution on the windshield and might make it unsafe so I need to determine how a bullet nose on the bottom 2/3 will affect the pressure on the flat upper 1/3. I will take photos today.
Randy
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Old 05-17-2011, 10:44 AM   #19 (permalink)
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I think you are missing the boat so to speak Randy. Forget the nose, concentrate on the tail. Cheaper, easier, more effective according to all accounts.
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Old 05-17-2011, 10:53 AM   #20 (permalink)
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I imagine to make only a 6 or 8 ft. tail. My MH is 40 ft. long, 13 tall and 8 wide. and is a diesel pusher. The really huge radiator is at the extreme rear of the vehicle. Air enters the engine area from the bottom and flows through the radiator and into the vacume at the rear of the vehicle. I assume that the vacume is strong and produces a strong air flow through the radiator. This might be an issue in the design of the tail.
Randy

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