Boat Tail - Fuelly Forums

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Old 02-10-2007, 11:52 AM   #1
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Boat Tail

Fashioned a boat tail out of cardboard and coloroplast. Did bi-directional runs North and South. Winds were 350@9 at the beginning and 360@14 after the end of the last run. Temperature remained steady at 45. Speed was 55. No cruise control but scan gauge showed average speed 55. Increase in FE 2.17%

With BT
N S
42.2 49.0
42.0 49.2
Avg 45.6

Without
N S
40.4 49.3
40.2 49.2
Avg 44.775

With BT
N S
42.0 49.5
42.1 49.7
Avg 45.825

Overall average 45.75 with BT
Overall average without 44.775

Total increase of 2.17%

Little disappointed with the results. Was expecting double what I ended up seeing. Although I am happy with the 45 MPG highway. I think that with cheap fabrications and crude attachment procedures that 3% is about it as far as mods go. Seems like every aero mods hit?s somewhere around 3%. Just proving that there is no silver bullet you just need to make sure your clip is full.

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Old 02-10-2007, 12:17 PM   #2
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That's almost exactly what I saw with mine.
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Old 02-10-2007, 03:58 PM   #3
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The new VW Polo diesel has a mini boat-tail. It's hard to see in this picture, but click the link below for a super huge zoom. You can see they added a plastic/fiberglass extension to the roofline & C pillar (it goes several inches past the back glass).




super huge zoom: http://www.autobloggreen.com/photos/...motion/156660/
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Old 02-12-2007, 06:36 AM   #4
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Nice work! So many hatchbacks could benefit from the boat tail. I think a longer boattail like basjoos' civic would yield a greater improvement in fe.
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Old 02-12-2007, 07:18 AM   #5
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The porsche cayenne has a little thingy on the top back also
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Old 02-12-2007, 07:22 AM   #6
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Too bad the factory roof racks (which will likely never have anything carried on them) negate any gain from the roofline extension
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