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  #1  
Old 05-16-2017, 05:45 AM
MVR London MVR London is offline
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Shorter than stock windscreen?

Hi all

I find that with the stock screen the wind blast hits me mid chest which makes it quite noisy at level.

If I raise myself a few inches higher, my head is in clear air and in a quiet zone.

So, I'd like to get a shorter than stock screen to make the air hit a little lower leaving my head in clear air.

A higher screen would put the blast right at helmet level which would make things worse.

Does this make sense?

I've noticed that if I put my arm across my chest it gets much quieter.

Any suggestions for a shorter than stock screen?

Mehul
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  #2  
Old 05-16-2017, 05:59 AM
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Re: Shorter than stock windscreen?

It makes a lot of sense to shorten rather than heighten a screen to get out of buffeting. I am not sure you will find a shorter one for the S and you may have to pick up a used stocker and experiment with cutting it down yourself much as I had to do to find a screen I liked for the XR
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Old 05-16-2017, 06:11 AM
MVR London MVR London is offline
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Re: Shorter than stock windscreen?

I thought about cutting one down, but it seems like a tough thing to do properly, especially for someone who is not so handy :-)
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Old 05-16-2017, 06:23 AM
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Re: Shorter than stock windscreen?

Quote:
Originally Posted by MVR London
I find that with the stock screen the wind blast hits me mid chest which makes it quite noisy at level.

If I raise myself a few inches higher, my head is in clear air and in a quiet zone.
I'm confused. If the wind blast off the screen is hitting you mid-chest, then that should put your helmet above the wind blast, and therefore in clear (albeit fast-moving) air. My goal is to have the wind blast hit me mid-chest (as opposed to my helmet), which is why I went with the Z-Technik dark screen when I wanted a tinted screen, because it has the same shape as the OE clear screen.

Quote:
Originally Posted by MVR London
I've noticed that if I put my arm across my chest it get much quieter.
Do you ride with a tank bag? Your arm across your chest is helping fill in the open space between the wind screen and your body, and preventing/reducing noise-generating turbulence in that area.
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Old 05-16-2017, 06:28 AM
MVR London MVR London is offline
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Re: Shorter than stock windscreen?

I figure the turbulent air from the top of the windscreen is hitting me in the chest which leads to a rumbling sound in the helmet

If I put my hand across my chest, this rumbling goes away.

If I raise myself off the seat a few inches, this rumbling goes away.

This rumbling is what I'm trying to eliminate.

No tank bag most of the time, though I do use one for longer trips.
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Old 05-16-2017, 07:45 AM
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Re: Shorter than stock windscreen?

I know you said you're not handy but it's not that difficult. Here's a Youtube video: https://www.youtube.com/watch?v=sCZjInmHWLk
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Old 05-16-2017, 10:32 AM
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Re: Shorter than stock windscreen?

Quote:
Originally Posted by MVR London
I figure the turbulent air from the top of the windscreen is hitting me in the chest which leads to a rumbling sound in the helmet

If I put my hand across my chest, this rumbling goes away.

If I raise myself off the seat a few inches, this rumbling goes away.

This rumbling is what I'm trying to eliminate.

No tank bag most of the time, though I do use one for longer trips.
This is starting to sound like a thread we had awhile back about reducing helmet noise. I think it ended without consensus resolution.

If the wind blast off the wind screen is really hitting you mid-chest (as opposed to your upper chest and neck area), then I don't think it is the cause of your rumbling sound. And so a lower wind screen is not going to solve it. Next time you ride at speed, try adjusting the angle of your head/helmet and see it that has any effect on noise. I have found that the noise in my Shoei Neotec varies with the angle of attack into the airstream.
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Old 05-16-2017, 02:32 PM
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Re: Shorter than stock windscreen?

Stock BMW K13 wind screens are very expensive . Be sure to take advice given and find a junker to mess with. I'd look at your helmet brand, (which is even more expensive. )
And, I hope you are using ear plugs, foam helps if inserted properly.
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Old 05-17-2017, 12:55 PM
MVR London MVR London is offline
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Re: Shorter than stock windscreen?

Quote:
Originally Posted by BeemerMikeTX
This is starting to sound like a thread we had awhile back about reducing helmet noise. I think it ended without consensus resolution.

If the wind blast off the wind screen is really hitting you mid-chest (as opposed to your upper chest and neck area), then I don't think it is the cause of your rumbling sound. And so a lower wind screen is not going to solve it. Next time you ride at speed, try adjusting the angle of your head/helmet and see it that has any effect on noise. I have found that the noise in my Shoei Neotec varies with the angle of attack into the airstream.

I have 2 different helmets and the same issue with both. And I have tried moving my head around - sound changes but does not go away.

It does go away entirely when I raise myself a few inches higher.
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Old 05-17-2017, 12:58 PM
MVR London MVR London is offline
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Re: Shorter than stock windscreen?

Quote:
Originally Posted by Beech
Stock BMW K13 wind screens are very expensive . Be sure to take advice given and find a junker to mess with. I'd look at your helmet brand, (which is even more expensive. )
And, I hope you are using ear plugs, foam helps if inserted properly.

I'm just going to buy an aftermarket screen (something around €100) and cut that to start with. I think 1 or 2 companies make replacements that are the same as the factory ones.

I've got good ear plugs, and the new Schuberth C4 helmet. I also have a BMW System 6.
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Old 05-17-2017, 02:09 PM
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Re: Shorter than stock windscreen?

Quote:
Originally Posted by MVR London
I have 2 different helmets and the same issue with both. And I have tried moving my head around - sound changes but does not go away.

It does go away entirely when I raise myself a few inches higher.
Then I suspect the wind blast off of the OE wind screen is NOT hitting you mid-chest.

Your plan to cut down an aftermarket wind screen seems like an appropriate way to test.
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Old 05-18-2017, 08:30 AM
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Re: Shorter than stock windscreen?

You may want to take off the current screen and see how that affects the clean air height.

On the '98 K12RS, radical shortening of the screen is required to get into clean air.

Quote:
Originally Posted by MVR London
Hi all

I find that with the stock screen the wind blast hits me mid chest which makes it quite noisy at level.

If I raise myself a few inches higher, my head is in clear air and in a quiet zone.

So, I'd like to get a shorter than stock screen to make the air hit a little lower leaving my head in clear air.

A higher screen would put the blast right at helmet level which would make things worse.

Does this make sense?

I've noticed that if I put my arm across my chest it gets much quieter.

Any suggestions for a shorter than stock screen?

Mehul
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