Hi,
A mate bought a BWS 6m Noise. Probably about a 2012 model .

It’s doing something that I haven’t seen before in the my 13 years in this game.

When powered up it seems to behave itself, but when you depower it a bit it gets this pivoting / rocking type of motion.

It’s not moving forward in the window then drifting back. It seems to just rock back and forward on the front lines. Worse when gusty.

Pull tension back on the bar it seems to right itself. I did notice that the bridle line that goes through the ring to back line does become slack when it’s doing it. I don’t understand why.

Maybe the line coming from the wing tip / back line is too long.

Any help solving this problem would be appreciated.

With the Revs the bridle lines actually twist and become shorter, that means the kites back lines end up longer when adding the shorter length of the bridle + the length of the front line.. The bar is tuned obviously and the lines are equal.

Tie a knot 2cm up from where you attach the back lines on the pig-tail of the kite. Try and fly it in light winds. depower the kite a little bit and you will find the sweet spot. Chew open your new knots and adjust accordingly.

This will work while your waiting on your new set of P-lines

Thanks guys.
That picture on the link is exactly what the back line looks like Steve.

On the 6m you don't actually need the p lines if you pump the kite up hard. If you read thru that link above it's mentioned in there. I have the same kite, found Dannos comments about removing the p lines which I did and it flies much better. Used it last night in fact.