 I've been going to Anzac Day now for about 20 years and I always attend the March and I noticed in the first every year I went to Anzac Day that people were carrying banners with holes cut in them and I asked around and asked why do people cut holes in their banners and I've seen them every year since and I get the feeling that there's some sort of urban myth or legend that somehow the wind will somehow be allowed through a banner and it will make it easier to carry and I know from very basic aerodynamics that cutting small holes in banners is a complete waste of time it'll just make the banners fray quicker and fail quicker and it really doesn't reduce the drag very much. We're doing a wind tunnel test to prove just once and for all but putting all these holes in the banners really won't make any difference. A series of tests we were running in the wind tunnel we first cut holes at around two and a half percent which matches the regulations we then decided to triple that up to about seven and a half percent then went even greater up to around 20 percent just so we could see what the difference was by increasing the size of holes in the banners. From the tests we ran we were able to pretty much confirm some of the earlier studies done and we essentially showed that when you cut holes to the size that most regulations suggest you do you get very little change in the drag loading on your sign. Toping that by showing this theoretically and practically in a wind tunnel governments will take notice and they'll amend their legislation and stop people having to cut banners, cut holes in their banners. We really would prefer governments of course to base their policy on evidence.