naked/faired? - ZX6R Forum
 
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post #1 of 6 Old 01-17-2017, 09:31 AM Thread Starter
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naked/faired?

If you go back far enough in time, almost all bikes were 'naked'.

Over the decades, fairings have come into vogue.

Knowing that the aerodynamics of the fairings in use today were intentionally limited in their effectiveness in the 1950's..... does anyone have any back to back comparisons of top speed, between a like model bike with and without fairings?

I ask, due to the Britten 1000. minimal fairing, due to the desire to reduce the cross section, and thereby drag. Just a teeny bikini, and the radiator tucked into the space between the wheel and the seat. A little 'bump' at the front of the motor to ease the airflow over the rider's knee.... less, is more.

Choppers and bobbers came about, because of the performance increase due to the drop in weight and (subsequently) drag.....

Are we again at that point?

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #2 of 6 Old 01-17-2017, 09:42 AM
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All I know is when I ride my Street Triple it struggles to do over 200km/hr. The ZX6R is a different story altogether (and the Daytona, the equivalent of the ST but with a fairing)...

Need to find the pic I had of me sitting on the Cardinal Britten. Ahh the good ol' days

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post #3 of 6 Old 01-17-2017, 09:09 PM
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I know for me at least, fairings are less important for their ability to make the bike have a higher top speed and more important to keep the wind off me while riding long-ish distances. You brought up the Britten V1000, amazing bike, and I've actually had the privilege to see one in person at the Barbers Museum. But that bike was used for track racing where total top speed didn't matter as much as other things like weight savings and suspension setup so they might have sacrificed a little aerodynamic efficiency to reduce the weight. If you look at bikes that are solely designed to go as fast in a straight line as possible, they have insanely efficient aero setups at the sacrifice of a lower weight and cornering ability.
For street bikes, I'd wager and say the full fairings are for looks and maybe to make it less windy for the rider. As for the fact that naked bikes are becoming more popular, I'd say that's more to do with the lower cost of entry and more comfortable riding positions and less to do with the fact that they might be a few pounds lighter than their fully faired stable-mates.

Relax...
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post #4 of 6 Old 01-18-2017, 01:55 AM Thread Starter
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Until the fairing gets to the size used on touring bikes, weather protection is pretty minimal.... the bigger it is the more drag it creates, particularly when there are disruptions in the airflow.

Each sharp edged break creates buffeting..... noise. Wasted energy.

Less disturbed air makes a body passing through air more efficient, and the rider's experience less noisey.

I prefer small or non faired bikes for these reasons.

The Ninja is not as obnoxious as it could be... I suspect that a bigger windscreen would increase the turbulence at the rider's head, and make the bike potentially slower overall. Not that I care about the last 20 MPH.

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #5 of 6 Old 01-18-2017, 06:07 AM
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Even if the bike can manage it, I find myself not wanting to go over 180 Km/h (112 mph) unless I'm ducking behind the cowl.
At that speed wind vibration and noise get annoying as hell.

Straight lines show the bike.
Curves show the rider.
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post #6 of 6 Old 01-18-2017, 07:57 AM Thread Starter
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The smaller the fairing, the more 'clean' the airflow hitting the rider. Less noise, with less turbulence/buffeting.

You can't get away from it altogether, being 'in the wind' is just that. Minimizing how much it beats you up, that's worth investigating.

I know I have ridden a 'standard' motorcycle more than 700 miles in a day, with a handlebar mounted wind screen. (That was a National Cylcle 'Deflector', in the late 1980's) The screen was no taller than my throat, no wider than my shoulders, and ended less than a foot in front of my helmet. It moved the air all the way over my head and made for nice quiet riding at 70+ MPH.

If I am riding at less than ~50 MPH, I don't need a fairing or windscreen, at all. At those speeds, the body work on the Ninja is just good to look at, rather than doing anything useful. The distance between the body mounted windscreen and the rider is enough that the airflow collapses into the space the rider is in making noise at the helmet. Due to the screen being small and low, the effect is minimal -- it's almost the same as having nothing at all.

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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