CivicTail project: ginormous aerodynamic tail on '07 Civic sedan

[freebeard]

It's interesting that the fit is so close already. How is the width at the bumper?

[MetroMPG]

I thought so too.

The width is pretty much the same.

[aerohead]

Darin,I was looking back at Blackfly and the Insight tail,compared to the Civic.They both had more of the elliptical cross-section like Morelli is discussing in his fluid tail article,especially Blackfly.
It kinda begs the question,would the Prius tail have a better shot at performance if those corners were softened?
I tried to give some images,but I can't get photobucket to work on this computer.I'm out in West Texas looking after a friends animals for 10-days and this machine doesn't seem to work for images.Sorry.

[MetroMPG]

Good question. I'll be interested in seeing the images you had in mind -- you could email them to me if you don't want to wait 10 days. darin@ecomodder.com

Initially, my plan is to just stick the tail on the Prius as-is (with any gaps filled in as required). I'll do a couple of runs to get some initial numbers and go from there.

But based on the effectiveness claimed for the other Gen 2 Prius tail we know about, I predict it will work better than it did on the Civic.

[aerohead]

Originally Posted by MetroMPG

Good question. I'll be interested in seeing the images you had in mind -- you could email them to me if you don't want to wait 10 days. darin@ecomodder.com

Initially, my plan is to just stick the tail on the Prius as-is (with any gaps filled in as required). I'll do a couple of runs to get some initial numbers and go from there.

But based on the effectiveness claimed for the other Gen 2 Prius tail we know about, I predict it will work better than it did on the Civic.

here's a second try,from Morelli's paper.Notice all soft perimeter radii

Here,Morelli has added a Kamm extension which modifies the angular greenhouse
upper edge into a softer radius,essential,he says,to get the 'fluid tail' to work.
This 2010 Kia Ray PHEV concept has the proper shape

[freebeard]

American Rifleman | Tested: Hornady ELD-X Bullet

There was a time in my [youth? middle-age?] when I thought the solution was a 45° chamfer. They like 7°, possibly because of the supersonic airflow.