Wind Deflector
08-27-2014, 03:19 PM
#1
Rennlist Member
Thread Starter
Wind Deflector
For those who are experiencing significant problems with wind buffeting here's an elegant solution:
www.blackmillperformance.com
www.blackmillperformance.com
08-27-2014, 04:33 PM
#2
4th Gear
Join Date: Aug 2014
Location: NYC
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It's funny I noticed and was really annoyed by the buffeting in my first couple of sessions on the track, but after that didn't really notice it. Also, would be good to get something that clips on or at least smaller than these, not really a fan of the look.
08-27-2014, 05:04 PM
#6
Considering that it diverts air to a significant degree that buffeting goes away, I would be concerned that such a small device disrupts aerodynamics to a significant extent on track (negligible on road) and I personally will shy away from it.
08-27-2014, 05:11 PM
#7
Three Wheelin'
If I fabricated a simple, temporary (snap over the door, close door) anti-buffeting tab based on Chuck911 design, would you guys be interested at $30 USD or less ?
Ryan
Ryan
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08-27-2014, 05:28 PM
#9
Three Wheelin'
[QUOTE=AC SATCO;11606360]
Here's a link. He had planned to have his son make some on a 3D printer. While 3D printer's are very handy, this is not the correct application for that material. I'd fab them from black kydex which is available as a sheet and formed using heat.
https://rennlist.com/forums/991/8168...91-coupes.html
Ryan
https://rennlist.com/forums/991/8168...91-coupes.html
Ryan
08-27-2014, 05:29 PM
#10
I suspect wind tunnel testing aims at minimizing Cd and maximizing aerodynamic stability with the windows closed. I agree that device will likely mess up what Porsche found but it might eliminate the buffeting.
Edit: just saw the link. Not sure, looks funky!
08-27-2014, 05:37 PM
#11
Three Wheelin'
[QUOTE=SamFromTX;11606400]
I would like to see Chuck911's design as well and if it looks clean and easy to add on/off, I would definitely be interested, for road use.
I suspect wind tunnel testing aims at minimizing Cd and maximizing aerodynamic stability with the windows closed. I agree that device will likely mess up what Porsche found but it might eliminate the buffeting.
Edit: just saw the link. Not sure, looks funky!
You guys are funny. Think of Chuck's work as an early prototype. Geez.
Ryan
I would like to see Chuck911's design as well and if it looks clean and easy to add on/off, I would definitely be interested, for road use.
I suspect wind tunnel testing aims at minimizing Cd and maximizing aerodynamic stability with the windows closed. I agree that device will likely mess up what Porsche found but it might eliminate the buffeting.
Edit: just saw the link. Not sure, looks funky!
Ryan
08-27-2014, 06:04 PM
#13
Rennlist Member
Thread Starter
Agreed Mike. It would be nice if you could add, then remove easily after your track day was over. The guy that developed it owns the 991 X51 pictured. He was solving a problem that was bugging him, so he decided to fabricate and market them. $100 seems more reasonable.
08-27-2014, 06:06 PM
#14
Rennlist Member
Thread Starter
08-27-2014, 07:16 PM
#15
Race Car
Here is the windflic I made from the thick plastic of a milk bottle. The motivation was to see how little wind diversion would be needed to fix the problem with a simple removable, appropriately priced (e.g. no $) solution.
The one with fewer bends stays on place with the door closed. The one with more bends fits over the black plastic triangle on the door, and holds firmly in place with the door open or closed, and can be put in place and removed in ten seconds when its wanted.
It only needs to be on one side to totally alleviate the pressure build up when one or both windows are all the way down and the sunroof is not popped in the back. The annoying sound is a product of the wind filling the low pressure interior and then escaping, fast enough to create a harmonic.
I tested it up to 120. The wind diversion is minor- there is no change in the car stability. It sits in my door cubby and would get used whenever I feel like cruising with the windows down. I typically pop the sunroof back.
It just works. Anyone can make this with thick cardboard, trim to taste and replicate with any bendable plastic stock.
If you require one with deviated stitching, send me the thread and I will custom make one for $200; 2 for $300 :-) Or, if there is and actual interest, I'll get my son to clean up the design and make batch on his printer. I have no idea what he would charge.
On a whim he did an iPhone holder for me for cruising in the 991 with Waze and phone in a good position in a cup holder, plugged into the outlet in the passenger well.
it also just works, holds the phone securely and despite the Eifel Tower design weighs next to nothing. http://www.shapeways.com/model/25705...upholders.html
The one with fewer bends stays on place with the door closed. The one with more bends fits over the black plastic triangle on the door, and holds firmly in place with the door open or closed, and can be put in place and removed in ten seconds when its wanted.
It only needs to be on one side to totally alleviate the pressure build up when one or both windows are all the way down and the sunroof is not popped in the back. The annoying sound is a product of the wind filling the low pressure interior and then escaping, fast enough to create a harmonic.
I tested it up to 120. The wind diversion is minor- there is no change in the car stability. It sits in my door cubby and would get used whenever I feel like cruising with the windows down. I typically pop the sunroof back.
It just works. Anyone can make this with thick cardboard, trim to taste and replicate with any bendable plastic stock.
If you require one with deviated stitching, send me the thread and I will custom make one for $200; 2 for $300 :-) Or, if there is and actual interest, I'll get my son to clean up the design and make batch on his printer. I have no idea what he would charge.
On a whim he did an iPhone holder for me for cruising in the 991 with Waze and phone in a good position in a cup holder, plugged into the outlet in the passenger well.
it also just works, holds the phone securely and despite the Eifel Tower design weighs next to nothing. http://www.shapeways.com/model/25705...upholders.html