Don't waste your money on a single bladed kite knife!
The preliminary results of my testing has shown that the double bladed hook knives, that I have tested, cut the tensioned test line with mere ounces of force, measured by the scale.....whereas the single bladed hook knives, (even practically new ones), can vary radically in the force needed to cut the test line, and can take up to 20 pounds of force, when hooked on the line, without being held exactly right, so that a somewhat delicate sliding motion of the blade can occur.
If anyone is interested, I can present a lot more opinion, and the facts that I base it on, concerning the following points:
(1) None of the hook knives, commonly sold to kiteboarders were originally designed specifically for a kiteboarders needs, but were made specifically for Parachutists, fishermen, emergency personnel, etc., and the main point, I would argue concerning this observation is that, unlike a kiteboarder, who is in trouble and trying to cut a line, these other people will most likely have both hands to use in cutting the line. They will have a better chance of positioning the knife in their hand, and will have a better chance of stabilizing the line with the other hand, so that they can take advantage of the full length of the blade, by using a sliding motion of the blade, rather than, is the likely case with a kiteboarder, only being able to hook the line, and give it a pull. This is where the single bladed hook knife falls far short of the double bladed hook knives! Don't count on them, unless you have a positive answer to the question: "Do I feel lucky, today?"
I realize that my posts are "long winded" so I will shut up now. I will present more opinion and the details of my test procedure if anyone is interested.