10-27-2011, 06:32 PM
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#11 (permalink)
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Master EcoModder
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Quote:
Originally Posted by MetroMPG
If you like, email me the .MOV file and I'll post it on EcoModder's YouTube channel. darin@ecomodder.com |
I'll give that a try. Fingers crossed 
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10-27-2011, 09:22 PM
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#12 (permalink)
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Master EcoModder
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I'll bet the file is (way?) too big for email -- you could try Dropbox?
Uploading to YouTube is easy, though.
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10-27-2011, 10:54 PM
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#13 (permalink)
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Master EcoModder
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Well, it's up on youtube. Neil was right, neither ISP that I use would forward the attached video via email. One service simply said as much, the other just choked and stopped without explanation.
Go to youtube.com and search for "Insight Rear Hatch Tuft Testing," or use this link directly:
http://youtu.be/1s807EGEpWc
I don't have immediate confirmation, but hope this all works out 
Last edited by jime57; 10-27-2011 at 11:06 PM..
Reason: correction
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10-27-2011, 10:57 PM
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#14 (permalink)
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Batman Junior
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Excellent - thanks for doing that work, Jim!
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10-27-2011, 11:05 PM
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#15 (permalink)
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Cyborg ECU
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Very nice. Does the fluttering indicate significant turbulence?
__________________
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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10-27-2011, 11:14 PM
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#16 (permalink)
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Master EcoModder
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OK. It seems to be up and working.
My take is this:
1. The middle row and the bottom row tufts all indicate attached flow, but slightly turbulent.
2. The top row tufts are more turbulent and I think that this is caused by the the airstream "tripping" slightly on the rather large open seam between the hatch and the roof.
3. Honda pushed the very limit with the hatch angle. They probably figured and optimum compromise between aerodynamics, length, and rear visibility.
Just as a guess, one might raise the hatch lid a couple of inches and achieve better aero. In a couple of weeks I'll probably give that a try. All comments very welcome |
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10-28-2011, 03:06 AM
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#17 (permalink)
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Batman Junior
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The front windshield wipers and door mirrors would also be contributing to the turbulence seen. (Assuming they are in place!)
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10-28-2011, 07:28 AM
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#18 (permalink)
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n00b.... sortof..
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Quote:
Originally Posted by MetroMPG
Not necessary to re-shoot. See above comment.
Also, you can remove the audio from a clip after it's uploaded to YouTube, if you're still concerned.
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or they will do it for you if they feel there is copywrite infringement.
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10-28-2011, 09:04 AM
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#19 (permalink)
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Master EcoModder
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Quote:
Originally Posted by MetroMPG
The front windshield wipers and door mirrors would also be contributing to the turbulence seen. (Assuming they are in place!)
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It seems to me that the turbulence is very slight. Probably about as good as anywhere else on the car. The tufts are six inches long, so it is kinda inderstandable that they might flutter a bit on the ends.
I have removed the front wiper and the right side mirror, so I'd just guess that we'd see some asymmetry if your explanation were the case.
One other thing I want to do is put tufts somewhere where I know the flow to be extremely good, like middle of the hood, and see how those look. It just might be that tufts need to be shorter, like 4 inches.
I was amazed that the turbulence did not get worse further back on the hatch. I had been conditioned to think that flow deteriorated as one got closer to the rear edge.
All very interesting. Seems Honda got it pretty much right. |
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10-28-2011, 09:30 AM
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#20 (permalink)
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EcoModding Apprentice
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Looks good! I just ordered my GoPro Motorsports so I'll be able to get some vids later on.
Planning on a boat tail?
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