Author Topic: How much sway on a foil  (Read 4213 times)

Offline jensk

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How much sway on a foil
« on: November 15, 2015, 01:49:49 PM »
While Berndt is in winterstorage i am playing with plexiglass. I'm trying to make my own airfoil.
Berndt is a '93 K75RT with electric windshield. because of my height i have a some buffeting/turbulence around the top of my helmet when going more than 100 km/h. It throws my head right/left. After an hour or more i feel rather tired in my eyes trying to focus.
The electric windshield does not have a foil/lip to raise the wind above my helmet so i thought that with a piece of plexiglas I could make a small airfoil to mount on the outside of the upper windshield - like the ones on the K100RS models.
So i have cut, heatet and bend the plexiglass to shape with a little invertet wing profile to raise the the speed of the air between the windshield and the foil. The idea is the the higher speed of the air between the foil and the windshield should be able to push the air in front of the foil/windshield 5 - 10 cm higher and thus above my head.

I have enclosed two  pictures from the front and of the profile of the foil. Does the profile of my foil sway enough or should i make the sway more? Maybe someone could post a picture of the profile of the K100RS foil so I ccould check the sway against my foil.


The milky look on the foil is the protective film that I will remove when i have finished it.
  • Copenhagen, Denmark
  • '93 K75RT
Past: Honda CB550K3, Honda CB550F, Matchless G80 and a couple of MZ's

Offline johnny

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Re: How much sway on a foil
« Reply #1 on: November 15, 2015, 02:15:03 PM »
greetings jensk...

at that slow of speed im thinking its your helmet not your windshield...

j o
  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Tuco

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Re: How much sway on a foil
« Reply #2 on: November 15, 2015, 02:57:46 PM »
How tall are you?
  • Waldport, Oregon
  • '87 K100LT, '87 K100RS, '97 DR350

Offline jensk

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Re: How much sway on a foil
« Reply #3 on: November 15, 2015, 03:07:11 PM »
  • Copenhagen, Denmark
  • '93 K75RT
Past: Honda CB550K3, Honda CB550F, Matchless G80 and a couple of MZ's

Offline drut

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Re: How much sway on a foil
« Reply #4 on: November 15, 2015, 03:10:44 PM »
K100RS foil works for shorter riders as picture but at 6'1" does little for me.

  • Newcastle upon Tyne UK
  • 1990 K100RS + 1980 Moto Guzzi V50 II + 1971 Aermacchi/HD 350ss
Much older but certainly no wiser!

Offline Tuco

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Re: How much sway on a foil
« Reply #5 on: November 15, 2015, 03:16:23 PM »
6 ft , I wouldnt think you would  have a problem. Experiment with it. Are taller windshields available?

Al
  • Waldport, Oregon
  • '87 K100LT, '87 K100RS, '97 DR350

Offline jensk

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Re: How much sway on a foil
« Reply #6 on: November 15, 2015, 03:24:02 PM »
I do not think that there are taller windshields available when you have the electric RT windshield.

I have made a steeper sway now. It's very easy. Heat the plexi in the oven at 170 degrees celsius and shape it the way you will have it.
Come spring and i will test it.
  • Copenhagen, Denmark
  • '93 K75RT
Past: Honda CB550K3, Honda CB550F, Matchless G80 and a couple of MZ's

Offline drut

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Re: How much sway on a foil
« Reply #7 on: November 15, 2015, 06:29:47 PM »
I do not think that there are taller windshields available when you have the electric RT windshield.

I have made a steeper sway now. It's very easy. Heat the plexi in the oven at 170 degrees celsius and shape it the way you will have it.
Come spring and i will test it.

They are available but not cheap & not a lot of choice.  http://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M=40&Ct=VA&SbCt=BA_15_40_VA_20
  • Newcastle upon Tyne UK
  • 1990 K100RS + 1980 Moto Guzzi V50 II + 1971 Aermacchi/HD 350ss
Much older but certainly no wiser!

Offline Scott_

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Re: How much sway on a foil
« Reply #8 on: November 15, 2015, 06:31:10 PM »
On my 2 LT's, 1 is stock and the other is 2" taller than stock.
The taller one give me less head buffeting for sure.
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Offline jensk

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Re: How much sway on a foil
« Reply #9 on: November 15, 2015, 11:46:23 PM »
I do not think that there are taller windshields available when you have the electric RT windshield.

I have made a steeper sway now. It's very easy. Heat the plexi in the oven at 170 degrees celsius and shape it the way you will have it.
Come spring and i will test it.

They are available but not cheap & not a lot of choice.  http://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M=40&Ct=VA&SbCt=BA_15_40_VA_20
Oh yes - they are not cheap. I think i will try out my foil to se if it helps on the buffeting.
I will report back when winter is over and Bernd and I are back on the roads.
  • Copenhagen, Denmark
  • '93 K75RT
Past: Honda CB550K3, Honda CB550F, Matchless G80 and a couple of MZ's

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