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woody
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« on: July 27, 2010, 02:42:35 AM » |
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Has anyone tried vortex generators to try and smooth out the buffetting from the windscreen.
Ive seen them used on Honda STs and they claim that they reduce the buffetting considerably.
The theorey is that if you turn the wind flow into a laminar flow pattern, it reduces drag and turbulance.
The wind turbulance is considerable behind my screen at 120klm/hr (about 65Mph) even more so when its a bit windy or Im behind a station wagon.
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Michvalk
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« Reply #1 on: July 27, 2010, 04:52:52 AM » |
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Lower wind wings do a good job of blocking wind. There are a number of kinds (brands) that attach to the forks below the windscreen. I added a set from Big Bike and it made all the difference.  |
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ricoman
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« Reply #2 on: July 27, 2010, 06:30:41 AM » |
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I had the same problem. Like michvalk, I added lower fork wind deflectors (made them myself out of 3/16 lexan and aluminum using some extra Memphis Shades brackets I had). They made a major difference and I would recommend using deflectors to anyone with a head buffeting problem. I have seen lip devices added to the top of windshields but don't know how well they work. www.saeng.com has some of this stuff. Their term is "micro-swirl generator". When you say "vortex generator", exactly what are you talking about? |
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take personal responsibility and keep your word
98 Tourer, black and chrome, added 8/11/10
98 Std, yellow/cream, totaled 8/3/10
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sandy
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« Reply #3 on: July 27, 2010, 07:18:02 AM » |
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I have Baker Air Wings and the shield is tilted back by using a bracket to push the bottom of the shield out 1"  |
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Gear Jammer
Member
Posts: 3074
Yeah,,,,,It's a HEMI
Magnolia, Texas
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« Reply #4 on: July 27, 2010, 05:02:14 PM » |
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I have a Hoppe fairing, lower fork deflectors and Baker's which have all but eliminated head buffeting.
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 "The problems we face today exist because the people who work for a living are outnumbered by those who vote for a living. |
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Art708
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« Reply #5 on: July 27, 2010, 06:17:54 PM » |
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Has anyone tried vortex generators to try and smooth out the buffetting from the windscreen.
Ive seen them used on Honda STs and they claim that they reduce the buffetting considerably.
The theorey is that if you turn the wind flow into a laminar flow pattern, it reduces drag and turbulance.
The wind turbulance is considerable behind my screen at 120klm/hr (about 65Mph) even more so when its a bit windy or Im behind a station wagon.
I have a Laminar Lip that I've tried on 2 different bikes. I never noticed much difference in the buffeting with it off or on. Expensive piece of nothing as far as I'm concerned...ymmv. |
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Art 2014 Kawasaki Concours 14 Black  |
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CamTom12
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« Reply #6 on: July 27, 2010, 08:38:42 PM » |
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Ive got a windshield and lower shields for my bike and before last week had never ridden one without the other. I put the windshield on in a hurry for some 2-up (my wife hates rural highways without it) and didn't have time to find where I'd put the lowers at. 15min later and I was digging through the garage to find them. Id never noticed buffeting before with them on and it was pretty rough without them!
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1998 Valkyrie Standard
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woody
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« Reply #7 on: July 31, 2010, 05:42:54 PM » |
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Thanks Guys;
Ill have a go at adding lower deflectors for a start.
Just one question.
Are they meant to deflect wind up behind the screen to reduce the drag or before the screen to channel air up or around the screen?
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Michvalk
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« Reply #8 on: July 31, 2010, 05:51:35 PM » |
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They're intended to push air up and over the shield. Also block the air from going over the top of the tank. That's where most of the buffeting comes from |
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Mr. Nuts
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« Reply #9 on: July 31, 2010, 06:48:57 PM » |
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The angle of my windscreen was too acute and it caused buffeting. Just tilting the shield back and down a little like Sandy's photo made a HUGE difference for me. Cheap and easy and solved my buffeting. Also lowered the shield a little so I can just see over the top. When you get it just perfect the wind just clears the top of your helmet by an inch or two. Hardware store brackets cut and drilled, and a few 10mm nuts and bolts, works like a charm.
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“Speed has never killed anyone.... Suddenly becoming stationary, thats what gets you.” - Jeremy Clarkson
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JetDriver
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« Reply #10 on: July 31, 2010, 08:26:21 PM » |
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Lower deflectors are effective, but I understand they also keep most any air from getting behind the windscreen, which means the temps you feel are going to go up. I also have a Laminar Lip. While I feel it does help, like Art708 suggested, I'm not sure the improvement is worth the money. They operate with the same principal of vortex generators. One thing that may help is a vent from a Gold Wing in the lower center of the windshield. It helps wash out the turbulence behind the windscreen. Just some thoughts.
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