Boat Tail - Fuelly Forums

Click here to see important news regarding the aCar App

Reply
 
Thread Tools Display Modes
 
Old 02-10-2007, 10:52 AM   #1
Registered Member
 
zpiloto's Avatar
 
Join Date: Mar 2006
Posts: 1,225
Country: United States
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.

__________________

zpiloto is offline   Reply With Quote
Old 02-10-2007, 11:17 AM   #2
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
That's almost exactly what I saw with mine.
__________________

MetroMPG is offline   Reply With Quote
Old 02-10-2007, 02:58 PM   #3
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
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/
MetroMPG is offline   Reply With Quote
Old 02-12-2007, 05:36 AM   #4
Registered Member
 
Join Date: Apr 2006
Posts: 228
Country: United States
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.
GasSavers_James is offline   Reply With Quote
Old 02-12-2007, 06:18 AM   #5
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
The porsche cayenne has a little thingy on the top back also
__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 02-12-2007, 06:22 AM   #6
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Too bad the factory roof racks (which will likely never have anything carried on them) negate any gain from the roofline extension
__________________

MetroMPG is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is there an ez way to get back to the dashboard? johnblue Fuelly Web Support and Community News 1 12-11-2011 11:41 AM
Multiple fuel ups - same date pdqford Fuelly Web Support and Community News 5 08-17-2011 01:04 PM
MPG Calculation knhobson Fuelly Web Support and Community News 14 04-02-2011 04:35 AM
Removing the water pump... yes? no? Matt Timion General Fuel Topics 32 07-06-2006 07:12 PM
Here you go SVOboy, something just for you. Compaq888 General Discussion (Off-Topic) 3 12-17-2005 05:11 PM

» Fuelly iOS Apps
Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 01:28 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.