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Old 08-08-2014, 07:50 PM   #1
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Aerodynamics

Tried searching but didn't get the answer I was looking for. Which would be more fuel, slanted front trailer, rounded front trailer, or V-nose?
I know it's still a big brick, but any little bit counts
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Old 08-08-2014, 08:22 PM   #2
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Slanted, rounded, V nose are all better than standard box.
Of those I'm thinking V nose might be best. It is proven the back end is more important than the nose.
Just look at a modern Jet airliner. A 747 has a rounded almost blunt rounded nose.
Now look at the rear edge of any thing else on the plane. Sharp to an edge.
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Old 08-08-2014, 08:37 PM   #3
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Don't know how much ; research / info ; went into the TV , roof mounted deflectors , but I know those who use them swear by them.
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Old 08-08-2014, 11:11 PM   #4
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Air drag increases with the square of speed. The air drag you're fighting at thirty doesn't double at 60, it quadruples. 90 mph would have 9 times the drag at 30. That's why a head wind sucks your mileage down so badly. The square backs of our units are just as draggy as the relatively square fronts. Even the sloping fronts have sharp corners on the sides. All the AC, vents, antennas. etc poking up out of the roof don't help, either. I was looking at the Evergreen Element and noticing that the much smoother front was also possibly helped out some by the curving inward rear cap. RV designers need to figure some of this out to clean these things up, and give us better mileage.
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Old 08-08-2014, 11:43 PM   #5
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So, something like an Airstream? Looks like a big Twinkie. Perhaps a rounded fiberglass front cap and the same on the rear. That box rear creates a huge vacuum bubble back there like the Nascar drivers like to draft in. But, are you going to save enough for it to be worth it? I think just lowering the overall height by 6 inches would help more. My frame less windows are nice but would be better if they were built into the side more. Fully enclosed under belly helps. How about that big awning and the arms for it on the side, that can't help.
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Old 08-08-2014, 11:48 PM   #6
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I'm sure you are all correct, but I sometimes feel a crosswind is harder on fuel mileage than head wind.
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Old 08-09-2014, 07:58 AM   #7
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Agree on cross wind.
The closer the front is to an egg shape the better. The roof deflectors if really close to trailer might work but they just make a bigger hole to move air. So does v shape they create a side vacuum added to the rear vacuum.
I found that my side racks on my diesel truck are the best for fuel mileage so now I leave them on. No one uses those anymore.
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Old 08-09-2014, 08:21 AM   #8
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How about these: http://www.airtab.com

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Old 08-09-2014, 02:56 PM   #9
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So I'm getting rounded front is better. What about adding a some sort of rear deflector to decrease drag?
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Old 08-09-2014, 03:46 PM   #10
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For the few thousand miles a year I tow, I just don't think it's worth it.
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Old 08-09-2014, 06:15 PM   #11
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I don't know for sure but I would gues the difference is almost minuscule. None of them are what could be considered fuel efficient so get the floor plan, size, and amenities you want. Your going to be staying in it a lot more than your towing it. Besides, as small as 3 or 4 MPH difference can make up for a lot of airodynamic deficiencies.
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Old 08-09-2014, 09:06 PM   #12
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Quote:
Originally Posted by Selah View Post
I don't know for sure but I would gues the difference is almost minuscule. None of them are what could be considered fuel efficient so get the floor plan, size, and amenities you want. Your going to be staying in it a lot more than your towing it. Besides, as small as 3 or 4 MPH difference can make up for a lot of airodynamic deficiencies.

Yes, slowing down makes a lot of sense, but with the rise in speed limits we need other stuff to help economize our towing. Texas Interstates have stretches where the speed limit is 85 mph...
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Old 08-09-2014, 09:52 PM   #13
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Quote:
Originally Posted by dcarver View Post
What about adding a some sort of rear deflector to decrease drag?
From this website: Airtab: Aerodynamic fuel savers for truck, tractor, trailer, bus, RV

Airtabs™ are patented after-market aerodynamic drag reduction add-on devices that provide users the following benefits;

FUEL SAVINGS: 2-5% range

SAFETY: Vehicle stability improvement, reduced lane excursions, roll over risk and improved handling in gusty wind conditions; Improved rear view mirror visibility and safer lane changes in rain or snow.

LOW COST: Rapid ROI in commercial use.

MAINTENANCE: No maintenance or special training required

RAPID INSTALL: Minimum vehicle downtime and no special equipment needed.

OPERATIONAL IMPACT: None


I've NOT used this product. I have seen lots of discussions suggesting that they don't work. I have seen lots of discussions suggesting that they're great.

Good luck in your quest for better fuel efficiency.

Take care,
Stu
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Old 08-09-2014, 10:08 PM   #14
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My TT was a slanted nose and 6500lbs dry weight.

My 5er is a bubble shaped aero nose and is 11,314lbs dry.

I got 10.5MPG towing the TT at 65. The 5er at the same speed and highways lets me net 11.2 in the one clean mileage run I've done. That to me speaks volumes about the rounded nose.
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