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Author Topic: Holes in the fairings -'splainations?  (Read 4421 times)
enzo
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« on: June 26, 2009, 12:29:13 PM »

Will someone explain this to me?  It can't be weight savings.  Aerodynamics?  I've seen it on older race bikes as well as the 250's/125's, but I can't figure out the advantage.

http://www.superbikeplanet.com/image/2009/motogp/assen/hugo/5.htm
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« Reply #1 on: June 26, 2009, 12:38:37 PM »

I think it's to improve stability when there are bad cross-winds, E.
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« Reply #2 on: June 26, 2009, 12:57:18 PM »

like dimples on a golfball.
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« Reply #3 on: June 26, 2009, 01:08:02 PM »

like dimples on a golfball.
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pennyrobber
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« Reply #4 on: June 26, 2009, 03:05:44 PM »

like dimples on a golfball.

Not the same as dimples in a golf ball. Golf ball dimples create a turbulent boundary layer that keeps the flow around the golf ball from separating prematurely. The effect is the reduction of form drag. the holes in the upper fairing help reduce the effects of cross wind and some drag but in a completely different way.
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enzo
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« Reply #5 on: June 26, 2009, 09:37:14 PM »

okay, thanks! waytogo
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« Reply #6 on: June 26, 2009, 09:57:37 PM »

IMO, it's mostly for when they're laid over like this:



Leaned over like that, a gusty side wind is going to load up the front tire.
May not be too fun at ~300 kph when you're sliding both tires.
When it was windy at El Mirage or Bonneville, it always got my attention.  Tongue
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« Reply #7 on: June 27, 2009, 02:24:08 AM »

Not the same as dimples in a golf ball. Golf ball dimples create a turbulent boundary layer that keeps the flow around the golf ball from separating prematurely. The effect is the reduction of form drag. the holes in the upper fairing help reduce the effects of cross wind and some drag but in a completely different way.

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« Last Edit: July 05, 2009, 07:31:02 AM by rockaduc » Logged

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Raux
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« Reply #8 on: June 27, 2009, 04:46:44 AM »

i kinda disagree. i think it smooths out the airflow in high speed straights. the low speed turbulence behind the fairing would tend to build up the faster you go, the airholes allows the highspeed flow to break up that lowspeed area and flow it smoother past the rider.
will be interesting to see if they reduce the height of the fairing in the future to do the same thing.
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gm2
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« Reply #9 on: June 27, 2009, 11:36:52 AM »

i kinda disagree. i think it smooths out the airflow in high speed straights.

so why do you think we don't always see them in that case?
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mitt
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« Reply #10 on: June 27, 2009, 11:56:49 AM »

so why do you think we don't always see them in that case?

It seems like only on certain tracks they show up.  Or could it be certain forecast? 

The might be be placebo's too like matched tires?

mitt
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fastwin
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« Reply #11 on: June 27, 2009, 12:09:17 PM »

I think one of the mechanics got drunk on Dutch beer and went ape shit with the drill and due to new Dorna cost cutting rules they only had the one upper fairing. laughingdp
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gm2
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« Reply #12 on: June 27, 2009, 12:17:04 PM »

i was suggesting that it's not to simply 'smooth out the airflow in high speed straights' -- or else we'd see it all the time, on all the bikes.  and cars.
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Novelo
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« Reply #13 on: June 27, 2009, 01:54:31 PM »

Guess it is for cutting down the affect of the wind issues they were having in Spain
http://www.motogpblog.com/archives/916

pg 11 Stoner suffers bad wind
http://issuu.com/motorcyclenews/docs/mcn060509?mode=embed&layout=grey
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Raux
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« Reply #14 on: June 28, 2009, 01:24:13 AM »

i was suggesting that it's not to simply 'smooth out the airflow in high speed straights' -- or else we'd see it all the time, on all the bikes.  and cars.

actually you might have seen it and not known it. Jim Hall used it on one of his CanAm cars. well canam was right. and jim hall did some great designs... but i miffed the make of the car wiith the holes. it was a Lola

« Last Edit: June 28, 2009, 08:29:56 AM by Raux » Logged
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