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Old 03-18-2015, 02:42 AM   #31 (permalink)
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Considering unwanted legal attention, I kind of recommend putting the tail length on the tail itself.

"This doohickey back here looks, wait [reads], hey, let me check this."

[comes back]

"Well, I guess that I need to let you go."

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Old 03-18-2015, 01:33 PM   #32 (permalink)
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As soon as you are (relatively) happy with the performance - fiberglass the cardboard!
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Old 03-18-2015, 01:50 PM   #33 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
...Oh, man. You had to ask. I'm going to guess ~40 hours where I was inside the garage and either looking at it or working on it. And ~20 hours where I was actually doing something productive.
Wow. This too is amazing. I only just noticed this thread (I don't have much time for the car anymore).

You are incredible. Seriously. What a funky idea for "fun and edutainment."

Subscribed. Can't wait to see those tests.
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Old 03-18-2015, 11:01 PM   #34 (permalink)
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Quote:
Originally Posted by Xist View Post
All of the weight cancels the aero benefits? Forty-three pounds? Four percent of the weight of the car?
Um, you're saying the car weighs 1075 pounds?

It weighs ~2,700 pounds, so 43 pounds is 1.6%.
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Old 03-19-2015, 01:48 PM   #35 (permalink)
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protection

Thanks for the compliments --- it doesn't look as nice in person as it may in these photos! (Mostly due to wrinkly shrink wrapped plastic.)

Quote:
Originally Posted by NeilBlanchard View Post
As soon as you are (relatively) happy with the performance - fiberglass the cardboard!
Nah. I'm likely only keeping the car a couple more months, and nobody else is going to stick this on an 8th gen. Civic.

To ensure it lasts for the duration, here's how it stays out of the weather when not in use...



Used boat shrinkwrap. Boat tail prophylactic!

Still waiting for good testing weather.
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Old 03-19-2015, 02:10 PM   #36 (permalink)
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Quote:
Originally Posted by MetroMPG View Post


Those of you following my kitchen-sink-megathread about the Civic "winter beater" have obviously seen this already. But I decided to break out the boat tail + Kammback info into a dedicated thread for wider edification and amusement.
so the area in red on rear window is an area of non laminar flow thus causing turbulance and excess fuel usage, is that how i am lead to believe what is going on there.
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Old 03-19-2015, 06:04 PM   #37 (permalink)
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red tufts

Quote:
Originally Posted by Asanelli View Post
so the area in red on rear window is an area of non laminar flow thus causing turbulance and excess fuel usage, is that how i am lead to believe what is going on there.
The pocket behind the tail lights is like a small,sideways notchback car section.The air separates at the edge of the 'cliff',then reattaches as it would on an extended boot/trunklid.
There is a local recirculation bubble and the tufts are dancing within this turbulence.
You do pay a minor penalty for the turbulence,but with reattachment,the outer flow skips over the localized disturbance and goes on as if it didn't exist.
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Old 03-21-2015, 05:51 PM   #38 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
HOW THE HECK DO I SEE OUT THE BACK?

It's got a rear plexiglass window. Also, I built in a high-center-mounted third brake light:

Would you have a picture of the view from the inside? Maybe with the boattail and with just the Kammback.
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[Old] Piwoslaw's Peugeot 307sw modding thread
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Old 03-21-2015, 06:25 PM   #39 (permalink)
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Metro, with the butt cover, it looks like your car is backwards!
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Old 03-26-2015, 10:33 AM   #40 (permalink)
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I know. I keep seeing it and thinking it's very symmetrical from the side view.

Quote:
Originally Posted by Piwoslaw View Post
Would you have a picture of the view from the inside? Maybe with the boattail and with just the Kammback.
Will do. I'm going to be away for the next 5 days or so, so I'll get that when I return.

It's actually a good, functional window -- and the view is the same with the tail on or off (can't see the tail through it.) In case you're wondering, the back part of the Kamm isn't clear. Just the panels on the top surface.

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