Partial Kammback

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Weather Spotter's partial Kammback

Introduction
One of the biggest aerodynamic problems with the majority of bluff body vehicles (most hatchbacks, vans, wagons) is the amount of pressure drag / size of the trailing wake. In other words, the rear of the vehicle is where the big gains are to be made.

That said, a hatchback configuration isn't automatically an aerodynamic death sentence. Several of the most slippery production cars in recent years (1st gen Insight, 2nd gen Prius, Audi A2) have used "Kammback" shapes, where the roofline tapers downward, following a particular shape (a "chopped" teardrop).

It's possible to retrofit this shape onto existing vehicles and gain a measurable improvement in fuel economy.


Contents

Instructions for mod

Information required: How do people perform this modification, pictures, problems, what to look out for
Information required: A listing for different ways to do this if its different on different types of cars

User experiences

Please enter your user name and any relevant data in the table

User data
User Name Car Make, Model, Year Cost of Mod Time to Perform Mod MPG Before Mod MPG After Mod MPG improvement guess Instruction Link
Weather Spotter Toyota, Matrix, 2006 $15 USD 12 hr 45.06 45.98 1.98% (.91 MPG) ABA testing 2.34% better aero (coast down testing) Weather Spotter's Data and How To
3dplane 94 Mazda Protege DX $34 8 hr limited testing showed that the particular design hurt MPG 3dplane's Kammback how to
wyatt 94 Suzuki Swift 5MT $10 12 hr 48 50.9 6% (2 1800+ mile trips) 12% better aero (coast down testing)

Problems / Consequences of mod

You might reduce your rear view, most states require a certain distance behind your car to be viewable. You also might add to the length of you car (parking issues).

References

Forum thread links

Weather Spotters thread

Making a permanent Metro Kammback extension

Suzuki Swift SedanKamm 4feet=6%FE

Mira aerodynamic modifications

5th generation civic hatchback - improving aerodynamics

My Kammback'ed VX

Kammback that did not help

External links

Personal tools