I used the system used by Elf on my Chrono V2 13m using some of the original lines, since it allows to trim the mixer and the lines on the pulleys have much more travel so that I can use the kite with bars with greater depower. I have not yet been able to prove how it works. If anyone is interested I have the exact measurements of the lines.
it allows to trim the mixer and the lines on the pulleys have much more travel so that I can use the kite with bars with greater depower.
Fortunately modern kites are not as big they used to be and biggest ones are high AR kites. It means chord length is moderate, which means required depower range is accessible with normal bar movement.
For C line row 1m pulley line is usually if not always enough. It allows almost 50cm movement at C line row, which is located at ca. 2/3 of the chord. Then 1:1 brakes (=bar movement) would be 75cm, which is more than(any?) kite can tolerate without backstalling.
Like I wrote earlier line lengths of speed systems are not at all critical, as far as they are reasonable. In principle mixer length should be in proportion to chord length, but because it doesn't matter that much same mixers are used in different sized kites.