Quote:
Originally Posted by bongodriver
Actually you are wrong, fluids can create pressure as well as vacuum depending on the surface shape they are passing, dynamic pressure is what the pitot measures for airspeed, next time you are alowed out into the community and are in a car, put your head out the window and tell me if you feel a pressing force on your face or suction.
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In a similar vein, the odd occasion I'M allowed out in the community I swear I've felt BOTH pressure and suction simultaneously. Riding the Hog on the Interstates/400-series highways (Canada) we occasionally see speeds of 80+ mph. Riding with no windshield and wearing half helmets, we obviously feel the wind pressure, but sometimes my buds and I have found it takes more effort to just draw in breath. It may be the wind pressure on our torsos, but the sensation is more like the wind is getting SUCKED out of our lungs. Could this be some sort of Venturi effect? Trust me, we all keep our mouths closed, especially in Junebug season, so there's no pressure equalization going on there.
When we ride with windshields attached, there's never been a problem.