Laminar Lip BMW F650GS/F700GS/F800GS (08+) W/Factory Tall Shield - B1139
The LIP is an inverted airfoil located above the rear edge of the windshield. As air flows between the windshield and the LIP, it follows the underside airfoil of the LIP and is redirected more vertically. This air eddy then diffuses the oncoming air, in effect, to raise the blast of this oncoming airflow. The end result is that there seem to be three different air speed zones as you ride along at a set speed:
1. Behind the windshield - very little wind speed
2. Above the windshield for 6 to 8 inches or more - a wind pressure well reduced from actual speed
3. Above this height the blast that was at windshield height before the LIP was installed
Because all fairings and windshields are different, the effectiveness of the LIP may vary model to model.
Another feature of the inverted airfoil is that it increases down pressure on the front wheel. As a motorcycle proceeds down the road, air pressure ( effectively from the front-- although the air really is not moving, the bike is) tends to rotate the motorcycle around its roll center lifting the front wheel and loading the rear. The LIP opposes this action to some degree.
The LIP does all this without your having to add a larger windshield. In many cases it works better than the taller replacement accessory windshields, because although they may be taller, they do nothing to control airflow.
NOTE!!! All Laminar Lips are designed to fit the Stock Windshields Only - B1139
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