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Touring windshield - turbulence

ploose

Tuned and Synch'ed
Joined
Nov 21, 2011
Messages
36
Location
Santa Fe, TX
Have bad turbulence on my 1400 Cal Touring around my head with 55mph +, windshield is not really adjustable...any suggestions or solution other than taking it off?
 
Think I have read somewhere that there is a lower screen option.
Should get the turbulence off your head and may also help with the top of the screen intersecting your line of sight if that was a problem.
 
If you can get air behind the screen, that would reduce the vacuum and thus some of the turbulence. A vent in the screen is one way to go. I used two PVC pipes to direct air up from the bottom of my screen to the driver side. Laminar Lip makes a screen that uses this concept.
 
All,

Thanks for y'all suggestions. I ended up with a windshield spoiler / extension from Wunderlich. This little thing worked wonders. It is pretty much working like the Laminar Lip but it is smaller and you can choose angle, extension reach etc. I can only recommend it. Good is also you can take it from one bike to the next, in case you run into similar turbulence issues. Here is the product info:

[youtube]http://www.youtube.com/watch?v=FCDfJyXnIQ0[/youtube]

Thanks again folks

P
 
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20131211_130059_2.jpg
 
For the thread..this is an MRA shield...mounts wont reach the handlebars so I turned some mounts on the lathe and mounted this to the two open threads on the upper triple clamp.
 

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On various bikes, I have found that defeating the low pressure behind the screen prevents the high pressure at the front causing air to spill from front to back in an unstable manner i.e. left/righjt/left etc. I normally achieve this by adjusting fittings so there is a sizeable gap between the bottom of the screen and headlamp e.g. about 4 inches. I also normally set the screen top edge so I am only just looking over it. Otherwise, if lower I can't ride round town with visor open. Sometimes this has needed a screen top extension and sometimes needs a bit cutting off the top. Some bikes ( Honda Pan European and Deauvlille) come with a gap or opening at the bottom
 
I had the same problem. Fixed it by making a new bottom bracket a little longer than the stock one. It tips the windshield back slightly and allows a gap between the headlight and windshield. This got rid of the low pressure behind the windshield. Just got to pull it back off and paint it black.
 
I had the same experience. My fix was to use the stock/factory mount bar with a smaller windshield. Also , I changed the orientation of the lowers and tilted them a degree or 3 more toward vertical. Hope the pic comes through. That screen is a Memphis Shade Alley Cat, 9" cut out that I modded to match the headlight shape. Its from Dennis Kirk, about 95 bucks.

MB

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DSCN0626
 
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I bought the MG oem lower air deflectors. Stopped the buffeting. I have the wunderlich too but I am too short. Don't like looking through the windshield as it is.
 
I too added the MG oem lower air deflectors and it eliminated the buffeting completely.
Me too! The factory accessory windshield lowers completely eliminated that annoying buffeting. I'm only 5' 7" but my wife, who is 5' 10", says it works for her as well. The lowers mount about a quarter inch behind the windshield. My guess is they channel just enough air upward (behind the windshield) to eliminate the buffeting.
 
Interesting. Clarification. Is the buffeting the lowers are preventing at helmet level? I'm getting buffeting from the medium size screen...I'm 5-9...how will installing the lowers help buffeting coming at helmet level? Thanks!
 
The lowers made a huge difference for me. I'm 6'1 with a 32" inseam. I cut down my touring windscreen 3" first. That helped but didn't solve the buffeting. Added the lowers and the problem went away!
 
This is from CalSci's website:

When you're riding on the highway, any windshield is pushing air away from the rider. This leaves a low-pressure pocket between the windshield and the rider. Some riders feel this low-pressure area as a push on their shoulders, "back pressure." The air flowing past the windshield wants to drop into this low pressure area. If the outside air is allowed to spill into the area between the windshield and the rider, the result is turbulence, noise, and drafts. When outside air spills into the rider area, it almost always falls in a curved path, causing spinning vortices of air. These vortices are noisy and can cause the battering and hammering on your helmet reported by some riders. Our windshields and vents are designed to funnel air into the rider region to relieve this low pressure area and greatly reduce the tendency of outside air to spill in. The vents are designed so that the air coming through them is quickly dispersed, leaving almost no detectable air flow at the rider. Our goal is to produce almost completely still air on the rider with no back pressure.

http://www.calsci.com/motorcycleinfo/Fairing.html#Windshield
 
OK...So for those of you who did some trimming on the stock or aftermarket shield...how exactly do you do that without making it look like a goat chewed on it...??
Jigsaw or ...??
 
OK...So for those of you who did some trimming on the stock or aftermarket shield...how exactly do you do that without making it look like a goat chewed on it...??
Jigsaw or ...??


I used painters tape and marked the cut line with a marker then slowly used my jig saw with a fine toothed blade to make the cut. After light sanding to get the edge right, I wiped the cut edge with a rag and acetone.
 
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