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What is the most aerodynamic cab

Obviously a Pete 379 has a higher Cd (coefficent of drag) than driving a Inteternational Prostar. The problem is when you get into the fairly streamlined cabs what ranks among the best in terms of Cd?

I'm a bit of a geek so if you know any lab proven numbers that would be great!

Answer this question I have this problem too

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Colani trucks are the world's most aerodynamic, followed by International's ProStar+, then Freightliner's Cascadia. The KW T680 is somewhat aerodynamic, as is the T660 and the Volvo VN.

International (a Navistar company) won the court case, using results they verified in a full scale wind tunnel at NASA's Jet Propulsion Laboratory. Pete 579, Pete 386, KW T660, KW T680, Volvo VN and even Freightliner's Cascadia were deemed less aerodynamic than ProStar by a large margin... 9.6% (Cascadia, which tied with International's LoneStar) to 11% (others) less aerodynamic.

Then they took the two best trucks in the test (Cascadia and ProStar) and ran them on a test track. Same drivers, same weather, same conditions. The ProStar beat the Cascadia, when spec'd as close as possible to each other on fuel mileage, EGR engine issues excluded. Throw EGR (MaxxForce or DD15 engine) problems into the mix, and they run neck and neck. So if ProStar was offered as a glider, fuel savings in fleet operations would be astronomical. It's too bad that's not the case.

The Cascadia has evolved for the 2014 and 2015 MY as the Cascadia Evolution, which further minimizes the differences between it, the ProStar+ and the Colani trucks. Both Cascadia and ProStar have been retested, and the ProStar finally adopted SCR in 2014 with the re-launch of Cummins engines.

I now drive a Cascadia Evolution myself and am already seeing 8+ MPG according to the computer (I should have card statements and hard numbers starting this week). The roof fairing helps improve efficiency and stability, and overall, I've been impressed so far.

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Colani Trucks have the lowest Cd, here isa link to a video aboutr them. http://www.youtube.com/watch?v=tMC4PlaR6... Enjoy.

Actually, Freightliner and International both claim to be the most aerodynamic. They even went to court over it, I can't remember who won.

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International won the case of ProStar vs. Cascadia. However, Freightliner hasn't gone down without a fight as they have come out with updates to the Cascadia that have made the differences between the two very minimal.

Every manufacturer claims their truck is the best but without proof they have no way to back it up. The only tried and true method to verify aerodynamics is to put the truck into a wind tunnel, as both IH and Freightliner have done. KW T680 and Pete 579 are also among the best (Luigi Colani had similar concepts years ago that led to the original KW T600 as well as Colani's own trucks). Claims must be backed up with facts and testing.

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Kenworth claims their T680 is among the best. They're claiming it's better than their T700 which they claimed was the most Aero truck on the market.

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Most aero... maybe by their own measurement but Freightliner and International use actual wind tunnels- not just computer modeling- to test and verify. The T680 was recently verified by Freightliner and International to be LESS aerodynamic than Cascadia or ProStar. In a wind tunnel, no less.

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Sorry to say your question has been answered in the European trucking community. Work here on this side of the ocean has not progressed as fast as in Europe. This is why their trucks get fantastic fuel economy.

Check out this new video from England about the new trucks in the UK:

https://www.youtube.com/watch?v=sBD003aR...

Don

ASE tech, electrical

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