Hi, I have Beamer III 5.0 and I wonder if it's possible to use it with a de-power bar. I've heard that I should readjust the lines, but how? I am thinking of using it for landboarding. Have anyone any idea how it should be made or eventually some photos.

You might be confusing de-power bar and regular control bar. Depower bar reqires a harness and a kite with a bridle built for de-power. It works to change the angle of attack and or sail shape during flight using the in-out movement of the de-power bar.

With a regular control bar, a harness is optional. It is designed for a fixed bridle kite like the Beamer III. Brakes go to a pulley at the center of the bar, and movement of the bar causes the brake in the direction of the turn to be pulled. Your Beamer will fly OK on a control bar. You may have to play with brake tension settings.