reduce the buffeting from screens, guinea-pigs needed.

Posted 12 April 2007 - 06:27 pm

After reading a few of the postings on screens, and a few have said that it dosen't matter what screen they use,
the buffeting is still there.

I had the same problem having just bought a Skidmarx touring screen the difference was poor.

I sat down last night on the drawing board, and drew some flow graphs and wind dynamics. Doddles etc......

Using what knowledge I have of aero-dynamics.

I realised that the main problem is the "eddys" from the top of any screen, are caused by the negative pressure from behind the screen.

So this morning at 6 oclock, I took the screen off and stuck some small plastic self adhesive spacers ( left over from a DIY project) on the rim between the fixing holes.

When you refix the screen it is held off the fairing by 2-3mm, this gives a gap for the air to get in behind the screen and hence reduces the -ve pressure and therefore the buffeting.

The difference is amazing and from the front of the bike you can't tell.

But what I need is for a few more to try it and to see if they agree.

There must a air gap that give the best results ??????

Cheers, Ivan

Edited by Geordie Guy, 12 April 2007 - 06:30 pm.

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Posted 12 April 2007 - 07:04 pm

Emile
www.piloot.com
'80 Honda CB400T Hawk, '92 Yamaha XJ600S Diversion, '90 Honda PC800 Pacific Coast, '92 Honda ST1100ABSTCS Pan European, '00 BMW R1150GS ABS, '04 Yamaha XP500i T-max, '01 Triumph Sprint ST 955i, '06 Yamaha TDM900A GT, '02 Honda ST1300A Pan European

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Posted 12 April 2007 - 07:24 pm

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Posted 12 April 2007 - 07:53 pm

QUOTE(Geordie Guy @ Thu 12th Apr 2007, 08:12 PM) <{POST_SNAPBACK}>

After reading a few of the postings on screens, and a few have said that it dosen't matter what screen they use,
the buffeting is still there.

I had the same problem having just bought a Skidmarx touring screen the difference was poor.

I sat down last night on the drawing board, and drew some flow graphs and wind dynamics. Doddles etc......

Using what knowledge I have of aero-dynamics.

I realised that the main problem is the "eddys" from the top of any screen, are caused by the negative pressure from behind the screen.

So this morning at 6 oclock, I took the screen off and stuck some small plastic self adhesive spacers ( left over from a DIY project) on the rim between the fixing holes.

When you refix the screen it is held off the fairing by 2-3mm, this gives a gap for the air to get in behind the screen and hence reduces the -ve pressure and therefore the buffeting.

The difference is amazing and from the front of the bike you can't tell.

But what I need is for a few more to try it and to see if they agree.

There must a air gap that give the best results ??????

Cheers, Ivan

Hm...
This solution sounds very interesting. Let's see some photos, ok?

Use www.photobucket.com. It's easy; just register and upload from your c'puter. And then load photos into your postings here.

TDM 900 2006 mod.:
MRA modded PUIG screen, air-box mod., Laser Duo-Tech cans, Powercommander, Symtec Motorcycle Grip Heater, Stebel Magnum (black), Centech AP-1 Auxiliary Fuse Panel, Hawkeoiler...

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Posted 12 April 2007 - 07:59 pm

Sounds like a... err well... sound theory to me. In the same way that many fairings have low vent holes. I look forward to the pictures.

And with the subsequent reduction in down force, it would be easier to do wheelies too

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Posted 12 April 2007 - 08:33 pm

QUOTE(Stuart-900 @ Thu 12th Apr 2007, 08:44 PM) <{POST_SNAPBACK}>

Sounds like a... err well... sound theory to me. In the same way that many fairings have low vent holes. I look forward to the pictures.

And with the subsequent reduction in down force, it would be easier to do wheelies too

Hope these come out all right, you just need something behind to lift the screen off the fairing.

Try it and see!!!!!!!!

Edited by Geordie Guy, 12 April 2007 - 08:39 pm.

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Posted 12 April 2007 - 08:46 pm

try again!!!!





Bloody computers!!!!!

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Posted 12 April 2007 - 08:51 pm

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Posted 12 April 2007 - 09:07 pm

QUOTE(Landy @ Thu 12th Apr 2007, 10:36 PM) <{POST_SNAPBACK}>

Looks worth a go and its easily reversable if it does not work.

Yep, true. I got those little buggers lying around, use them for doors. At least it makes it easier for water and dead flies to get out of that space...

Maybe it will do wonders on fuel economy as well, steering will be much lighter too although that slot looks veerrrry tiny.

Edited by E-njoy, 12 April 2007 - 09:08 pm.

Emile
www.piloot.com
'80 Honda CB400T Hawk, '92 Yamaha XJ600S Diversion, '90 Honda PC800 Pacific Coast, '92 Honda ST1100ABSTCS Pan European, '00 BMW R1150GS ABS, '04 Yamaha XP500i T-max, '01 Triumph Sprint ST 955i, '06 Yamaha TDM900A GT, '02 Honda ST1300A Pan European

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Posted 12 April 2007 - 09:14 pm

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Posted 12 April 2007 - 11:40 pm

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Posted 13 April 2007 - 06:09 am

QUOTE(Sparra @ Fri 13th Apr 2007, 12:25 AM) <{POST_SNAPBACK}>

Does this mean that in the rain (the thing we get occasionally and you get ALL the TIME) will be forced in the gap as well? Meaning water streaming up the inside of the screen. This may not have been tested as yet. It would be an excellent solution if it works.

Nice suggestion re. the adaptors. Ivan. As a further thought, would it be worth using rubber grommets or O-rings, or some sort of rubbery strip between the screw positions, to preserve the flexibility of the rubber nut attachment system? Or are they already soft components you're using? I seem to recall DIY stores sell little stickon silicon "spots" as feet for ornaments etc. Might that need longer screen screws though? Is that something you already need to think about?
The mod. is like one excellent feature on my (X-lite) helmet which pops the visor forward about 3mm (see here and here). resulting in a nice breeze which doesn't bring rain in. OK, the profile is different for a w/screen, but the principle is there. The TDM screen isn't for me to look through in practical terms, and does anybody worry if the inside of the screen gets wet (as it does anyway)?

Edited by Pict, 13 April 2007 - 06:54 am.

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Posted 13 April 2007 - 06:21 am

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Posted 13 April 2007 - 07:07 am

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Posted 13 April 2007 - 08:43 am

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Posted 13 April 2007 - 09:01 am

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Posted 13 April 2007 - 09:22 am

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Posted 13 April 2007 - 10:10 am

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Posted 13 April 2007 - 10:20 am

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Posted 13 April 2007 - 10:42 am

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