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SirFallalot |
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SirFallalot Trackday Trickster
Joined: 25 Oct 2018 Karma :
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Posted: 00:17 - 11 Sep 2021 Post subject: Purpose of screens on sportbikes |
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Bit of an awkward question...they're obviously a big part of aero, and when sitting "upright" they do deflect all the air from the body to just below the helmet, making mway speeds feel like 50mph on a naked, however, for sustained rides or higher speeds, how are you meant to tuck in? Look just over the screen, or chinbar-to-tank took through the screen?
On the former, there is far too much turbulence, even with earplugs the noise and force is unbearable, on the latter, I guess the field of view is fine if you're so that fast you only need to look straight, but that's not always the case, with commonly seen tinted screens you can't see fuckall, and the eyes will be almost rolling up in your head too I can't see this being any better than sitting normally?
So really, if you're cruising for extended periods, how are you meant to sit? Is this where double bubble screens come in too? Although if they redirect the air any further up then you'll get the turbulence sitting upright, so even worse off? I suppose different bikes will be different, my example is the zx9r. ____________________
Lexmoto Valiant 125; 94 CB400; 96 CB750F2; 81 CB750 (restoring, lol not gonna happen); 2001 ZX9R(It's about to go :c); 2012 R1200R; 2015 R1200RS |
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trevor saxe-coburg-gotha |
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trevor saxe-coburg-gotha World Chat Champion
Joined: 22 Nov 2012 Karma :
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doggone |
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doggone World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 08:39 - 11 Sep 2021 Post subject: |
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Try doing the same speed on a naked bike and you'll appreciate just how much force the fairing is actually taking.
You sit normally and it generally creates a "bubble" of air that flows up over your helmet. If you are getting turbulance, your head is probably up out of that bubble, try ducking it down a couple of inches and it'll probably turn into a smooth flow of air, still forceful (you have your head in a 90mph wind) but smooth. If that's the case, you're a bit tall for the bike. They were designed by Japanese people who tend to be shorter than your average Brit. If this is the case, fitting a flip-up or double bubble screen will sort the problem.
If you take your left hand and move it away from the bike while travelling at speed, you can generally feel exactly where the edge of that bubble of air stops and whips your hand away in the slipstream. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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SirFallalot |
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SirFallalot Trackday Trickster
Joined: 25 Oct 2018 Karma :
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Zen Dog |
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Zen Dog World Chat Champion
Joined: 11 Aug 2004 Karma :
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Posted: 12:24 - 13 Sep 2021 Post subject: |
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SirFallalot wrote: | my question is, are you meant to be able to tuck in for sustained higher speeds without buffeting, and are you meant to look through the screen or just over it? Or just still sit up and enjoy the floating effect? |
By "meant" do you mean "did the manufacturer intend the rider to tuck down/behind the screen at high speed"? If so, it may depend on the bike and the screen in question. On a full-on sportsbike with a standard screen, yes probably, and you're probably intended to look through the screen when tucked in. Double bubble screens etc. remove the need to tuck. On a tourer, you're almost certainly not intended to tuck, and you'd be looking through the screen a lot of the time in normal use anyway. ____________________ Current - '94 VFR750FR, '00 VFR800FI Previous - '10 Street Triple R, '92 MZ ETZ301, '05 TTR250, NSR125R, KMX125, "Honda" Win (chinese copy of an old Honda design with a C90 engine)
My bike trip around S.E. Asia 2010/2011 |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 13:06 - 13 Sep 2021 Post subject: |
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If you're properly travelling at speed, there isn't really an option, you get tucked in or you'll land up getting peeled off the bike and flapping along behind it like a washing line. I usually still peer over the top and round the edges of the screen though. Arching your shoulders helps aerodynamics slightly as well (which is why they put humps in race leathers).
One thing I've noticed when travelling at stupidly high speeds is that the airflow over the top of your helmet can create a slight vacuum inside your lid, presumably due to the venturi effect. Although it might even be airflow over your back creating a low pressure area over your curved back like an aircraft wing. It can become quite hard work to breathe, you have to force breaths in and out. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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MarJay |
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MarJay But it's British!
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ThunderGuts |
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ThunderGuts World Chat Champion
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xX-Alex-Xx |
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xX-Alex-Xx World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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Fat Angry Scotsman |
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Fat Angry Scotsman World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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stinkwheel |
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stinkwheel Bovine Proctologist
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Polarbear |
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Polarbear Super Spammer
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chickenstrip |
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chickenstrip Super Spammer
Joined: 06 Dec 2013 Karma :
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Posted: 16:34 - 13 Sep 2021 Post subject: |
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I always used to get a bit of head buffeting and wind noise for years. At 6'2", I suppose I'm not really the right height for standard screens and bike design, but different aftermarket screens didn't seem to improve things much. Cured all of that by chance with a helmet purchase - HJC RPHA10. Not had any of that since.
I like Thunderguts' answer, seems to make the most sense. Sports bike screens aren't designed to be keeping the wind off for long periods, just short blasts along race track straights. There are double-bubble replacements available for some models which would probably make things a little more bearable for road use, as Polarbear mentions, but then you might get the problem he points out. If you want what sports bikes give you, on the road in everyday use I suppose you should expect to have to put up with some compromises. ____________________ Chickenystripgeezer's Biking Life (Latest update 19/10/18) Belgium, France, Italy, Austria tour 2016 Picos de Europa, Pyrenees and French Alps tour 2017 Scotland Trip 1, now with BONUS FEATURE edit, 5/10/19, on page 2 Scotland Trip 2 Luxembourg, Black Forest, Switzerland, Vosges Trip 2017
THERE'S MILLIONS OF CHICKENSTRIPS OUT THERE! |
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weasley |
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weasley World Chat Champion
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Kawasaki Jimbo |
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Kawasaki Jimbo World Chat Champion
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Kawasaki Jimbo |
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Kawasaki Jimbo World Chat Champion
Joined: 09 Oct 2015 Karma :
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chickenstrip |
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chickenstrip Super Spammer
Joined: 06 Dec 2013 Karma :
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Posted: 18:13 - 13 Sep 2021 Post subject: |
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weasley wrote: | chickenstrip wrote: | I like Thunderguts' answer, seems to make the most sense. Sports bike screens aren't designed to be keeping the wind off for long periods, just short blasts along race track straights. |
And yet race teams put double bubble screens on their bikes for use on tracks, so who exactly is the lower screen meant for? |
Little people. I think Marquez is about two feet high isn't he? ____________________ Chickenystripgeezer's Biking Life (Latest update 19/10/18) Belgium, France, Italy, Austria tour 2016 Picos de Europa, Pyrenees and French Alps tour 2017 Scotland Trip 1, now with BONUS FEATURE edit, 5/10/19, on page 2 Scotland Trip 2 Luxembourg, Black Forest, Switzerland, Vosges Trip 2017
THERE'S MILLIONS OF CHICKENSTRIPS OUT THERE! |
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Posted: 18:32 - 13 Sep 2021 Post subject: |
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For the cruise you get tucked in.
For as long as comfortable.
Rest you chest on the tank. (Avoid potholes. )
Most strain is on back of the neck.
As mentioned, If you're on a track you're not tucked for more than anything like a minute so neck strain isn't an issue there.
Screens are now wind tunnel tested for effectiveness.
Manufacturers are desperate to sell their wares. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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stinkwheel |
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stinkwheel Bovine Proctologist
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weasley |
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weasley World Chat Champion
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G The Voice of Reason
Joined: 02 Feb 2002 Karma :
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Fizzer Thou |
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Fizzer Thou World Chat Champion
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Posted: 11:10 - 17 Sep 2021 Post subject: |
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The previous owner of my 5JJ-R1 fitted a double bubble screen to it when it was only a few weeks on the road.I have found that,after riding a friend's 5PW-R1 with the OEM screen fitted that it was far too low,but it suited him okay as he is a shortarse.
The setup on my R1 suits the lines and the purpose of the bike.It was very comfortable for my 5'10" stature while sport/touring in frogland back in 2014
https://i.postimg.cc/3xSdDpbr/12605313-996350100424562-7001382163323401360-o.jpg
The barn door fairing on my FZR1000R,by comparison,is comfortable with the standard type screen.I do sometimes dip my head and shoulders a bit lower so as to get out of the windblast at 80+
https://i.postimg.cc/vBN6pf6N/20200807-175437.jpg ____________________ Just talk bikes.What else is there?
Always have a 'Plan B' |
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Old Thread Alert!
The last post was made 2 years, 224 days ago. Instead of replying here, would creating a new thread be more useful? |
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