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Old 09-27-2012, 04:38 PM   #561 (permalink)
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That looks so cool, I really like the QR code idea.

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Old 09-27-2012, 04:48 PM   #562 (permalink)
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Quote:
Originally Posted by Sven7 View Post

It Blends in With Everything! by Tyler Linner, on Flickr

Note flow detachment aft of the hatch lid gap filler.
Wow!
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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Old 09-27-2012, 04:52 PM   #563 (permalink)
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Quote:
Originally Posted by Sven7 View Post
Note flow detachment aft of the hatch lid gap filler.
Ha! I did notice those dust bunnies before I saw your comment.

Even loaded up the full-size Flickr photo of it, to which I said to myself, "needs more ensmoothening."
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Old 09-28-2012, 12:23 AM   #564 (permalink)
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What's the hole just aft of the gas filler flap?
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Old 09-28-2012, 04:11 AM   #565 (permalink)
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I like that small stencil (the smallest one I think)
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Old 09-28-2012, 07:21 PM   #566 (permalink)
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Some tuft testing today, but no drive along. That will come tomorrow.






Tuft Testing Again! by Tyler Linner, on Flickr

I have a question for those who have done low speed testing. The 30mph video shows that the tufts aren't really doing much... hanging down and such. Should I disregard this evidence and just go by a high speed test?

Quote:
Originally Posted by Galane View Post
What's the hole just aft of the gas filler flap?
Sooper seekrit hatch latch handle bandle. Opens the hatch.
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Last edited by Sven7; 09-28-2012 at 07:35 PM..
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Old 09-28-2012, 08:07 PM   #567 (permalink)
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Woohoo! Tuft testing videos! Short but tantalizing....

I think the tufts are doing pretty much what they "should" be doing, but dang, those tufts are looooong! And therfore kinda heavy.

The "25 mph is OK for tuft testing" rule apparently assumes short, light tufts. Never thought about that before!

So going a little faster would probably help clear things up a bit, just to make sure the air is overcoming gravity's pull on the wooly bits.

That said, I think you can still make some conclusions that will hold up in a higher speed test:
  • Up front, it's normal to see downward flow on the sides of the car aft of the front wheel, since there's high pressure at the windshield and lots of flow coming down around the A-pillar.
  • The "hanging" tufts on the rocker panel are probably in separated flow behind the front wheel. (or at least very turbulent flow)
  • Looks like you've got attached flow on the top of the tail, right to the tip - congrats!
  • Upper sides of the tail look decent too.
  • Looks like separation on the bottom of the tail though, at least around that single row of tufts close to the end. (Put a couple more tuft rows further forward for tomorrow's video!)
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Old 09-28-2012, 08:14 PM   #568 (permalink)
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(PS - you should put a link to your build thread in your vid descriptions. Lovers of tuft testing, UNITE!)
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Old 09-28-2012, 08:21 PM   #569 (permalink)
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Tuft tests look good. Bottom looks a bit steep.
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Old 09-28-2012, 09:37 PM   #570 (permalink)
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When I did my tuft testing, I found that using 2 1/2" lengths of thin lightweight cotton string gave the best results.

I tested the string alongside actual yarn and found that the yard had a tendency to stick to itself and anything around it - including body gaps and such .

I also ( tried ) to stagger the tufts apart so that the airflow would be clean and not influenced by the tuft directly in front of it.

On areas such as the rear windshield that get lots of glare, I tried different colors to see which showed up best. Sometimes white just disappears . I think it might be best to experiment with this, or perhaps have one side dark and the other light color

I hope you find someone that can act as a chase vehicle so we can get some more time to see what is going on with the airflow.

Love the car ! Thanks for posting

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