I’m happy to share a mod for the concept air firefly 4m that I got from the designer, Ben. The mod is relatively simple, and involves sewing 5 simple additional bridle attachment points, and tying 6 additional bridle lines.
The effect of the mod is to dramatically reduce fluttering when the wing is depowered. Single-skin kites are known for this tendency, and it limits the upper range of the kite. This mod not only makes general flying more pleasant but also increases the comfortable upper end of the kite.
Disclaimer: I am sharing this with permission of Ben, but the description of the mod is mine so it might not represent Ben’s ideas 100%. I have only tried the mod once, but the effect was so immediately noticeable that I thought it worth sharing immediately.
The idea is to add additional bridle attachments half way between the C (third bridle row) and the Z (the last row). I call them D0 on the center rib, D1 on rib 1 and D3 on rib 3 (and symmetrically on the other side of the kite. Giving 5 attachments in all). To each of these you add a new bridle that joins with the corresponding C bridle connection. The lengths are given in the picture below:
To attach the bridle the simplest way is to have an oversized bit of line and make a 1cm loop in the end with an overhand knot. You larkshead this to the attachment point, making sure the loop passes over the knot. If you experiment with the length you can make it so that the knot sits close to the webbing. Then measure the desired length from the webbing and mark the bridle at that point with a marker pen. Tie a figure-of-eight knot just above the mark, open the bridle connection a it and insert the line and pull tight. The knot should hold the line. There are fancier ways o doing this but the original bridle is made with just simple knots. The picture shows D0 and D1 tied together and inserted into the bridle junction.
I hope these instructions are clear. The load on these new lines is light so there may be many other ways to connect the new bridle and sew new attachment points. I don’t think the measurements are millimetre critical.
Enjoy, and thanks to Ben for sharing the development.