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Old 10-09-2017, 03:36 PM   #71 (permalink)
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I assume you've tried the hairdryer trick? Heat the sticker with a hairdryer to melt the glue and it might pull off easier. Then clean with naptha to get the residue off. If worried, try some on a hidden area to make sure it doesn't hurt the paint.

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Old 10-09-2017, 03:38 PM   #72 (permalink)
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Photoshop?

I'm wondering what you could do in the area between the rear fender flare and the camera mount. Maybe gurney flaps or partial base plate[s]. Sort of the opposite of front-end dive planes.

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Old 10-09-2017, 05:43 PM   #73 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Nice! I bet that custom fastback roof has cleaner flow than your open top though. It would be cool if you could borrow one if just for testing purposes. I am looking forward to coastdown testing results.
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Old 10-09-2017, 09:55 PM   #74 (permalink)
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The Carson-style lift-off top had a frame of electrical conduit, covered with chicken wire, horse-hair felt and canvas.

You could experiment with welding rod covered with boat wrap.
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Old 10-11-2017, 03:44 PM   #75 (permalink)
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^ Searched for images of the Carson top - neat!

I know you guys really want to see an aero top on this car, but it ain't gonna happen! This car was bought for top-down fun.
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Old 10-11-2017, 04:20 PM   #76 (permalink)
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Coastdown results: good news, bad news

Well, I spent over 3 hours gathering & analysing coastdown test numbers yesterday & today... And I've got good news and bad news.

Bad news first: the data were too noisy to conclude ANYTHING about either the skirts OR this fancy "prototype" decklid extension/spoiler (and little side spoilers):



Here are the variations tested, 3 runs per:

1) top up, windows closed, skirts on, rear spoiler on

The rest were all with the top & windows down (except windows up for one run, where noted):

2) skirts, rear spoiler
3) skirts only (removed spoiler)
4) skirts, windows UP
5) removed skirts (windows down again)

The differences between runs 2, 3 & 5 were smaller than the deviation within those sets. So they unfortunately showed nothing conclusive.

But there's some good news. A couple of things emerged conclusively above the noise, one of which we already knew, and one that I wasn't sure about.

The one we already knew: the best aero was with the top up. Yes, even that lumpy, bumpy top dragging a separation bubble behind it. This is well known in the Miata racing community (and fitting a hard top is even better than running with the soft top up).

The other thing that stood out above the noise was the answer to this question: is it more aerodynamic to have the side windows up or down when the top is open?

Answer = windows up is better.

If I wanted to be optimistic about the skirts & the spoilers, I'd look at single worst (highest drag) result of all yesterday's runs was in the last set with everything removed from the car. But the amount of deviation of that whole set really makes it impossible to say that conclusively.

Need moar datas!

I really need to re-test. More runs per set. Or get a wind tunnel. I dunno if I'll get to it this year or not -- I'm running out of time. Making stuff is fun. Actually figuring out if that stuff helps, hurts or makes no difference is time consuming and sometimes frustrating.
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Old 10-11-2017, 04:45 PM   #77 (permalink)
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entertainment factor

On the bright side, the combination of cardboard skirts + rear spoiler on this little red car caused the biggest bystander commotion I've seen to date:

2 girls on the sidewalk stopped, turned, pointed and one actually yelled as I went by:

"OMG! WAIT... is that ... THAT IS ALL CARDBOARD!!"

At that point, we were all laughing.

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Old 10-11-2017, 04:48 PM   #78 (permalink)
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Quote:
^ Searched for images of the Carson top - neat!
Quote:
... And I've got good news and bad news
One hyphenated word: T-top. You know it would work.

So tell us the difference between 1 and 2.

Varnish it and see if it survives the winter?

edit:
So I'm looking at that last picture and thinking — remove the trunk lid and make a replacement that is twin faired headrests and a single hoop roll bar. Then the Targa part could be a bikini top.

A small central back widnow similar to the Porsche 918.


https://www.flickr.com/photos/54584165@N06/16280651950


https://i.ebayimg.com/images/g/4VsAA...Hu5/s-l300.jpg

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Old 10-11-2017, 04:53 PM   #79 (permalink)
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The numbers are average seconds per set, coasting from 100 to 40 km/h:

Set 1: 71.4s (top up/windows closed, skirts & spoilers on)

Set 2: 62.4s (top open, windows open, skirts & spoilers on)
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Old 10-11-2017, 04:54 PM   #80 (permalink)
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Quote:
Originally Posted by freebeard View Post
One hyphenated word: T-top. You know it would work.
Next year!

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