The buffeting and windscreen thread for '04-'11 DL650 and '04-'12 DL1000 - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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General V-Strom Discussion Talk about all things V-Strom not limited to just one of the above models

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  #1  
Old 09-14-2006, 02:50 PM
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Default The buffeting and windscreen thread for '04-'11 DL650 and '04-'12 DL1000

Been reading the messages regarding windshield turbulence and installed a Laminar lip. I also added a tank bag. I have K7 650 but imagine this applies to 1000's also.

Test ride after mods was interesting. Windshield turbulence gone but then encountered MORE turbulence coming up under my chin and couldn't figure out where it was coming from. Turns out it is the air hugging the tank fairing, running above my legs, up my front between me and the tank bag which acts as a venturi! Enough to jostle head around!

I think this didn't show up before because without the tank bag and Laminar lip, the air was coming around tank fairing and being pulled foward by vacuum behind windshield instead of hitting me.

I could almost negate all turbulence by raising my legs upward; pushing up on footpegs with balls of my feet. I can also stop it by leaning forward until contacting tank bag which effectively blocks air. So, now I'm going to design some type of "wind wing" mounted to fairing to break up air stream coming around tank.

I'm 5'10" with 30" inseam. I imagine that taller rider's legs may already be blocking this mind-numbing turbulence. Just FYI.
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  #2  
Old 09-14-2006, 08:07 PM
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I'm 5'10" with a 30" inseam too. I have been running a cut-down stock shield and the wind is no issue. I recently put on a Givi shield for a long trip and found the same upward airflow over my thighs. At one point, I actually had rain running up the face shield of my helmet, inside and out. Put your left arm horizontally across your chest and it becomes still and silent. I'm interested in what you come up with as a fix.
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Old 09-14-2006, 09:31 PM
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Keep us informed. Post pictures
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Old 09-15-2006, 07:50 AM
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Default Out of pocket for a couple of weeks

but I will be working on this problem when I return and will post any findings/solutions.
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Old 09-25-2006, 10:19 AM
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i've noticed the exact same thing as weeVgone.

the solution i think is some sort of vortex generator.

here's an explanation to you non-aeronautical types:
http://www.aerospaceweb.org/question...cs/q0009.shtml
http://www.aerospaceweb.org/question...cs/q0255.shtml

granted the v-strom is not an aircraft but i suspect the principals of air-flow apply here. seemingly, the design of the fairing/windshield starts to direct air but fails to direct it smoothly around the bike and rider.

one idea i had was fabricating something like these mini-vortex generators as illustrated on this website:

http://www.microaero.com/ImageGaller...na_A185F_.html

and placing them on the tank fairing.

a working solution would not only quiet things down on the V-strom but probably help fuel economy.
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Old 09-25-2006, 11:46 PM
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I have noticed the same upward direction of the windblast. I thought this was rather strange since I have demoed many bikes with various sized fairings and have owned a Nighthawk-S with a full fairing for years and the direction of the wind was always down over my helmet and my chest. So I'm wondering, could these vortex generators help and where would they be placed??
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Old 09-26-2006, 12:32 AM
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Hmmm...I haven't noticed anything unusual, about wind flow. Maybe I am just built weird, or the Givi just really works for me!
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Old 09-26-2006, 12:47 AM
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After installing the Laminar Touring Lip in '05 I've had zero wind problems.
(Except after a bowl of chilli on a long ride )

Al
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Old 09-26-2006, 09:30 AM
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OK you guys w/no turbulence issues [i find this facinating].

we're not talking issues with the windscreen. it's seems those w/issues have found solutions w/laminar lip, new windscreen, or new mounts or it just dosen't bother them.

we're talking issues w/the fairing here guys - air flow coming up from under the bike!!!

how about a simple 'lil test?

the next time you're riding at least 60mph, hold up your left hand and see if you feel air flow coming up in front you between your knee and the handle bars. pass you hand to your left below your helmet - any harsh air flow there? notice any changes in air flow as you pass your hand directly in front of you, to your left and below chin level?

i can literally rest my L/hand on what feels like a ducted flow of air that comes between my knee and the gas tank at 70mph indicated.

this is where i'm hearing/feeling windnoise/turbulence under my helmet (not around or atop). when i block this flow with my arm, things become much quieter.

my configuration:

hepco crash bars, explorer tank bag, emgo mirrors, OEM knuckle guards, mad-stat w/s mount, laminar touring lip, flush mount turn signals & forks lowered 1/2".

i'm still toying the w/idea of [inconspicuous] vortex generators and hope to do some experiments this week which i'll report on.
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Old 09-26-2006, 08:07 PM
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Default I THINK I'M ON TO SOMETHING!

this afternoon i decided to play around with aerodynamics on the strom fairing.

WeeVgone, i think you'll pleased to hear that i'm on to something and that my thinking that the air-flow is getting all messed up after it goes past the fairing is correct.

so, i tried blocking the air coming between the crash bars and the fairing on the left side:


then on the right fairing, i placed a couple of vortex generators i cobbled together with cardboard and alum. tape:



a test ride showed no change on the L/H side. however, i noticed a SIGNIFICANT change on the R/H side. no longer the ducted flow coming up and striking me in the shoulder. feeling about for the air-flows with both hands it was clear that the vortex generators actually work - in this case, helping to direct the air evenly around the bike - the air was (no pun intended) clearly less turbulent on the R/H side where my experimental devices were installed - flowing more smoothly than the L/H side w/out the devices.

i'm going to try to source these devices from aircraft supply hopefully in plastic and in red to match my fairing. i've also thought of making them of aluminum stock or plexiglass. the trick with the clear plexi will be afixing them to the fairing.

I think i'd like to have the vortex generators smaller and more numerous - say 3 or 4 per side. they might look sort of weird but for the difference in improved riding comfort i felt well worth it.
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