Parafoil from China.

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[KaoS]

I question if you dont start modding the sail shape itself along with the bridle

I suspect the airfoil profile is the problem.  Bobbing will occur if there is irregular airflow over the rear of the top surface.  When there is low air pressure above it, that part of the wing rises.  But if the momentum of that rising motion lifts that part of the wing too high, there is no longer a low pressure area above that section of the wing, so it drops.

Repeat as above!

A larger version won't bob as much - the mass of air inside the parafoil is more difficult to shift up and down in such a hurry.

A long fuzzy tail will damp down the oscillations.  This is a bit like trying to flick a length of rope back and forth- easy to do with a short rope, more effort required with a long rope

[pompebled]

In the meantime, I also ordered the slightly larger version Jim flies in his video.
Should be nice as comparison material.

Well, the larger version arrived quite late in the year, summer overhere is over and I only got to fly the new kite in between terrible weather, rain an way too much wind.

This first outing, in light conditions, with and without tails, showed a similar flight charactaristic as the one in Jims video in the OP, so no surprises there.
The pull is very moderate and even with two tails, the kite flies overhead at a very steep angle when the wind picks up.
The larger kite with the single bridle row can be flewn on a lighter line than the smaller one with the adapted bridle, which has more pull (which is a no brainer, the cause is the second bridle row, preventing the kite from leveling out like the single row one does).

Like the smaller one, this kite will also benefit from a longer bridle, as the stock one tends to pull the outside cells in too much, making them colaps in low wind conditions when starting the kite from hand on a short line.

I did fly the smaller one quite a lot this summer and when there's sufficient (constant) wind, it's glued to the sky, despite the less than perfect shape on top.
Adding a third row of bridle will be done this winter.

Regards, Jan.

[pompebled]

With a little luck, the weather will be better coming weekend, so maybe I can go testing with the longer bridle I made on the larger parafoil and take some pictures.
Wind should be about 3Bft, which is more than sufficient for these kites.

After all the rain we had, a pair of rubber boots will be mandatory, the field I usually fly, lies pretty low...

Regards, Jan.