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Homemade airfoil to remove buffeting at high speed Thu May 05, 2016 6:43 pm
jkh
active member
On Berndt, my '92 K75RT i have a lot of buffeting around the top of my helmet at speeds above 80 km/h. At higher speeds the buffeting can be so severe that it blurres my sight.
So i tried to make a small airfoil to lift oncomming air just 5 cm higher. I used a piece of 4mm acrylic for the prototype airfoil.
I heatet it for 15 minutes in the oven at 170 centigrades - took it out and pressed it down on my premade form til it cooled off. My choosen form was a small invertet wing profile.
My theory is that the inverted wing profile will make the air betqween the airfoil and the windscreen go faster than the air in front of the airfoil. The result is the the air stream between the aitfoil and the windscreen pushes the oncomming air higher up and over my helmet.
For the trial run i cut four small pieces of 4mm acryl as 2 x 8mm standoffs and taped it al to my windscreen. The top of the foil flush with the top of the windscreen.
I went for a ride to test. At speeds lower than 80 km/h there is no difference to detect. But then there was previous no buffetting at this speed so that’s ok. At speeds higher than 80 km/h the buffeting has gone away. I tried speeds up to 140 km/h and there was no buffeting.
Next I will remove the remaining protective foil from the acryl and make a permanent mount.
Highly recomended.
So i tried to make a small airfoil to lift oncomming air just 5 cm higher. I used a piece of 4mm acrylic for the prototype airfoil.
I heatet it for 15 minutes in the oven at 170 centigrades - took it out and pressed it down on my premade form til it cooled off. My choosen form was a small invertet wing profile.
My theory is that the inverted wing profile will make the air betqween the airfoil and the windscreen go faster than the air in front of the airfoil. The result is the the air stream between the aitfoil and the windscreen pushes the oncomming air higher up and over my helmet.
For the trial run i cut four small pieces of 4mm acryl as 2 x 8mm standoffs and taped it al to my windscreen. The top of the foil flush with the top of the windscreen.
I went for a ride to test. At speeds lower than 80 km/h there is no difference to detect. But then there was previous no buffetting at this speed so that’s ok. At speeds higher than 80 km/h the buffeting has gone away. I tried speeds up to 140 km/h and there was no buffeting.
Next I will remove the remaining protective foil from the acryl and make a permanent mount.
Highly recomended.
Last edited by jkh on Fri May 06, 2016 2:02 pm; edited 2 times in total
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'93 K75RT - Previous bikes: '53 AJS Matchless, a lot of 70'ties Honda sohc/4's and some MZ's
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