Does the second rear line go all the way up to the kite, and then, around a pulley? Or just part-way up the to the kite, where it could pass around a pulley? If so, then, the set-up would consist of a "block and tackle", with a 4:1 advantage (correct me if I am wrong), and this would do two things:
(1) decrease the bar pressure, by a factor of 4
(2) increase the length of the "throw" needed to depower the kite
Also, you could probably make a case for
(1) allowing finer control of the depower mechanism
(2) allowing finer control of the turning mechanism
(3) increasing the drag, due to line resistance
If any of my assumptions are true, does anyone know why a kite racer would want to do any of the above to his kite and bar set-up?
it would increase bar pressure by a factor of 4 and decrease the length of throw to depower the kite.
the reason the first bow kites had this was because they needed like 2 meters of bar throw to depower them. the pully bar reduced that to half.
he probably has like 10000000m lines to send the kite pointing as far into the wind window as possible and the line stretch would make turning the kite difficult. increase the amount of line you can pull (by 4 times) then you can effectively turn the kite again and compensate for the line stretch.
it's def not for the depower, because in the 1:1 mode the cab's depower "100%"