Rebuilt the boattail

Discussion in 'My Ride' started by basjoos, Sep 27, 2007.

  1. basjoos

    basjoos Well-Known Member

    The boattail I built last fall on my 92 Civic was so effective, FE-wise, that I decided to make it a permanent addition to my car, replacing the Coroplast and clear vinyl boattail with one made of aluminum sheet and Lexan. I recycled most of the original aluminum bar framework in the new boattail and the new boatttail has the same proportions as the old one. I extended the car's cargo area into the boattail, so now with the back seats down, I have 6-1/2 feet of load floor (4-1/2" of cargo space behind the back seats when I'm carrying 4 people). I also installed a functioning hatch (the stock hatch was covered by the original boattail).

    I had the Civic off the road for over a week while installing the mods, during which time I drove our Honda Odyssey and Ford F150. When I first took the modified Civic out for a drive after a week's worth of getting used to driving "normal" vehicles, I was impressed by how differently it drove than your typical vehicle. Most cars slow down fairly quickly when the power is cut, especially at highway speeds, but the aerocivic only very slowly loses speed when power is cut. It makes a normal car feel like driving around with the parking brake lightly engaged.

  2. johnf514

    johnf514 Zoom? Try Glide!

    This may sound silly, but the car looks beautiful, basjoos. I hope folks can take what you've gained through experimentation with aerodynamics and directly apply it to making vehicles slip through the air more efficiently.
  3. MnFocus

    MnFocus hanging member :)

    I'm very impressed bas' !! Looks great !
  4. Skwyre7

    Skwyre7 Well-Known Member

    All I can say is, "Wow!"
  5. 2TonJellyBean

    2TonJellyBean Well-Known Member

    Excellent work... any idea what the net weight impact was?

    I'll bet the Cd would be pretty good going backwards as well!
  6. brick

    brick Answers to "that guy."

    One word: WINGS

    And btw, great work! :D I'd love to see a wind tunnel test on that beast one day.
  7. basjoos

    basjoos Well-Known Member

    Probably not much change in weight from stock. I lost the steel tailgate and rear glass and gained some aluminum sheet/rod and Lexan sheet. The handling hasn't changed at all.
  8. ATL

    ATL Well-Known Member

    that looks really good, the biggest flaw with the old tail I saw was how it covered the hatch, and this one takes care of that!

    (if I didnt love being able to park anywhere in my yaris I would consider doing something like that) I bet it was fun making to create
  9. philmcneal

    philmcneal Has it been 10 years? Wow

    omg i want one! how much you think you spent on materials just making the body? aerodynamic sexy
  10. Right Lane Cruiser

    Right Lane Cruiser Penguin of Notagascar

    VERY cool, Basjoos!! That's very professional looking -- I was just sitting here imagining the rest of the car looking that clean?? With a good paint job that would be AWESOME. :thumbs_up:

    By the way, I'm still on board if you decide to start selling aero-modded cars!!!!
  11. SlowHands

    SlowHands Hypermiling Ironman

    Wow Basjoos, just Wow... that really looks good. My hat is off to you.
  12. Chuck

    Chuck just the messenger

    I'm impressed by the results and the effort.

    I'm bad about not finishing projects, so kudos for getting it done!
  13. tbaleno

    tbaleno Well-Known Member

    Good job. Much better than your old one. Now if you could find a way to integrate the rear wheel covers and still be able to change the tires, the back end would be perfect.
  14. vtec-e

    vtec-e Celtic MPG Warrior

    Excellent job! Well done. So now, whats next...
  15. WriConsult

    WriConsult Super Moderator

    Wow. That is fan-freakin'-tastic. Awesome job.
  16. brucepick

    brucepick Well-Known Member

  17. basjoos

    basjoos Well-Known Member

    The boattail upgrade cost about $200 in materials. Prior to this, all of my aero mods had costed $210.
  18. basjoos

    basjoos Well-Known Member

    Convert the front skirts and nosepiece from coroplast to aluminum, then a new paint job.
  19. Ruminator

    Ruminator Ohio Fisherman

    That is a great project car you've built.

    I wonder if aerodynamically you would gain/lose by having the rear section formed down to a ground effects height above the ground rather than rising?

    Overall net might be a loss with my idea due to added weight involved?
  20. Blake

    Blake Well-Known Member

    I think it would be a loss, but not because of added weight. One of the ideas on making aerodynamic vehicles is the smooth the flow of air transitioning in the back of the car. Making everything come to a point is what's commonly called the teardrop shape. Making it come to the ground would limit the ability of the car to effectively smooth the underbody flow with the air coming over the top.

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