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I am the law.
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Discussion Starter · #1 ·
You know you have a good corporate geek-fight a brewin' when people start dropping SAE-bombs. :sonicjay:



http://www.thetrucker.com/News/Stor...EnginequestionsCascadiaaerodynamicclaims.aspx



International Truck and Engine questions Cascadia aerodynamic claims

The Trucker News Services
9/6/2007

WARRENVILLE, Ill. – International Truck and Engine Corp. is questioning competitor Freightliner’s recent claim that its new Cascadia is “officially” more aerodynamic than other Class 8 commercial vehicles.


“No truck that we have tested has outperformed our new ProStar in testing to Society of Automotive Engineers (SAE) standards, which include the whole trailer as well as the tractor in real-word simulations; Freightliner simply cannot say that,” said Steve Gilligan, assistant general manager of International’s Heavy Vehicle Center. The Cascadia was tested in Freightliner’s private facility, which cannot accommodate a full tractor-trailer, stated an International news release.


The difference between the testing methods is critical, according to Bob Weber, International’s chief engineer of heavy vehicles. “Since their test does not include the aft section of the trailer, it does not allow a wake to form behind the vehicle as it does on the road,” said Weber.


Both the aft end of the trailer and the size and shape of the wake behind the vehicle “have a profound influence on the overall aerodynamic drag of the tractor-trailer combination,” Weber said. “A vehicle’s wake changes shape and becomes more pronounced as cross winds (and subsequent yaw angles) increase.”


“International’s ProStar is uniquely designed to minimize this wake and to achieve outstanding aerodynamic performance across the wind spectrum that drivers encounter every day on the road,” noted Weber. “It does not appear that Freightliner is presenting aerodynamic drag data based on the wind-averaged drag coefficient formulation recommended in the SAE best practice for truck and bus wind-tunnel testing (SAE J1252).”


Gilligan said International is looking forward to delivery of a Cascadia, ordered to conduct testing according to recommended SAE standards. However, these plans have been postponed due to an apparent delay in the shipment of Cascadias. Additionally, chassis skirts apparently will not be available until late in the year, the release said, “which will impact testing of full aerodynamic specifications.” International’s release further stated that its “objective is to test all competitive products in a simulated real-world environment that removes factors that could distort the aerodynamic results.”


International said it stands by results of previous tests that demonstrated ProStar to be more aerodynamic than any other Class 8 truck being operated in North America. International has spent more than $1 million conducting full-scale tractor-trailer testing to SAE standards at Canada's National Research Council Institute for Aerospace Research, the news release stated. Competitive Class 8 vehicles including the Freightliner Century, Freightliner Columbia, Peterbilt 386, Volvo VNL780 and the Kenworth T2000 were tested, filmed and the results documented, it said.

“None of these vehicles was more aerodynamic than ProStar, and at least one tested as much as 14 percent less aerodynamics. Aerodynamic design has been shown to be one of the key factors that can improve fuel efficiency.”


International acknowledges that while Freightliner used a reputable agency, Auto Research Center Inc., to observe the testing, ARC later stated that it “was not contracted to validate the flow quality of Freightliner’s wind tunnel nor establish the criteria for the these tests,” Gilligan said, adding that ARC uses full trailers when it conducts its own 1/8th scale wind-tunnel testing of tractor-trailer combinations in its own facilities.


“When the Cascadia package becomes available, International will support independent third-party fuel-economy testing of the Cascadia compared with the ProStar. These results will be published,” the release stated.


International Truck and Engine Corp. is a wholly owned subsidiary of Navistar International Corp. Additional information by clicking here: www.navistar.com.
 

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Covered in mud...
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17,915 Posts
How boring.

Whats next, a smackdown between Singer and Husqvarna on who's sewing machine can stitch faster?
 

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Moonlight stomper
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5,958 Posts
How boring.

Whats next, a smackdown between Singer and Husqvarna on who's sewing machine can stitch faster?
to truckers and raiseing fuel prices anyone with a CDL cares:miff:
 

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I am the law.
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29,823 Posts
Discussion Starter · #5 ·
How boring.

Whats next, a smackdown between Singer and Husqvarna on who's sewing machine can stitch faster?
Hells yeah! I want to see that. :rock:
 
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cliff notes: 2 companies have the "best" product because they use different testing standards to make themselves look better. whats new?

one may be more legit then the other though.
 

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I'll keep my 379 Pete, thanks.
 

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Covered in mud...
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to truckers and raiseing fuel prices anyone with a CDL cares:miff:
So, go to a truckers forum (I'm sure Longarm can tell you some, he probably posted his lemon there..)..

I could have cared less about it, and I had a CDL. I ran short distance city hauling tandems/tri-ax dumps, etc. Wind resistance? whoopdy-do.
 

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So, go to a truckers forum (I'm sure Longarm can tell you some, he probably posted his lemon there..)..

I could have cared less about it, and I had a CDL. I ran short distance city hauling tandems/tri-ax dumps, etc. Wind resistance? whoopdy-do.
Why drag Longarm's lemon into this, it has nothing to do with a post on commercial truck wind tunnel testing.
 

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hoo dat. wat.
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So, go to a truckers forum (I'm sure Longarm can tell you some, he probably posted his lemon there..)..

I could have cared less about it, and I had a CDL. I ran short distance city hauling tandems/tri-ax dumps, etc. Wind resistance? whoopdy-do.
Whoa.

A burn and Street Cred wrapped up in one post...
 

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Haggar your kidding , how many times you posted about dogs on here ? Take it to a dog forum :stan:
 

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$9.00 vanilla malt
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to truckers and raiseing fuel prices anyone with a CDL cares:miff:
Not everyone that drives a truck is a owner/operator and has to pay for their own fuel.
 

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Moonlight stomper
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5,958 Posts
Not everyone that drives a truck is a owner/operator and has to pay for their own fuel.
ya but lots of them get fuel consuption bonus it only matters to the long haul I quess you could change it to...my favotire truck in teh Freightshaker XL classic and like my fav Jeep it has the aero dynamics of a brick:sonicjay:
 

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to truckers and raiseing fuel prices anyone with a CDL cares:miff:

No only truckers looking at a new truck care. Every trucker is not going to run out and spend $100k on a new truck to save a little extra cash every year on fuel.
 
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