Here’s another entrance at The Alexander Stadium for Uk Athletics using 16″ balloons.
Here’s an example of the same location with 11″:
This shows the difference between 16″ & 11″ balloons on a 7 pole arch. Bigger arches are sometimes too flexible so I helium filled the 16″ Red & White to get more lift in windy conditions.
The below image shows the structure slightly floating before attaching to the base plates.
Also, here’s an example of how flexible these can get:
16v11