I’m a product designer from Australia and I decided there had to be a better way to keep beach umbrellas, 4wd awnings, gazebos and portable awnings from blowing away in the wind.
As a previous teacher of aeronautics in a private boys school I was quite familiar with the aerodynamic forces in play when it came to flight. All that was needed for an object to take flight was for the amount of lifting force acting on it to be greater than the force of gravity holding it down.
The shape of these very light weight shade structures means that as a column of air (the wind) moves across them the distance across the outside of the roof of the structure is much longer due to its triangular shape than the direct path the air can take underneath the structure. This results in the air spreading out across the top making it less dense causing an area of low pressure. The easy path underneath forms an area of high pressure. This generates an upward force called lift. Once the lift exceeds the amount of downforce generated by gravity the object will lift off the ground.