Roughly translated
There is one problem that has always bothered me.
The cloth on the upper side bar is wrinkled
I was sure it wasn't a production problem, I tried removing the upper horizontal bar, which this wrinkle would be better, but it wouldn't solve the root of the problem.
One day I decided to get rid of the wrinkle at the root, so I took the kite apart and cut off the excess with a knife.
Finally I put it up and I did it, I got rid of the wrinkle.
Yesterday I went to fly it and I noticed that it seemed to be more agile than before, yoyo was faster and the pull had increased a little.
I'm not sure if this is a good thing or a bad thing
I think it is normal, that there is a wrinkle in the sail. This will help to form the correct shape during flight. Basically the wrinkle will go away, if there is enough wind preasure in the sail. So it can only be seen, when the kite is on the ground. This was the intended design that Birger came up with.
But I can not say what the impact on the flight performance is, when you cut the sail to remove the wrinkle.