Hi All!
I would like to propose a theory about the "Spongy Feeling" of foils.

I believe that what is called "spongy feeling" is possibly a more even distribution of the stresses through the canopy and a more progressive transfert of the pull from the canopy to the rider through multiple bridles, for foils. For inflatables, and even more for C, less bridles means that the pull from the canopy travels more directly through a lower number of lines to the rider.
Let's try to illustrate the above theory using an example. Let's compare a kite whose canopy is linked to the rider using 4 lines (C shape kite) and a kite which may have, say 30 line attachments to the canopy (a foil). When you turn the C kite, the pull from the canopy travel towards the 4 lines without being directed to the rider and concentrate into the 4 lines to the rider, giving a feel of reactivity and responsiveness of the kite. For a foil, the stress of the canopy will spread between the multitude of lines and will travel ealier, more progressively and less simultaneously, to the rider.
It seems that the "spongy feeling' theory was strong a few years ago, during the 'C Age'. The theory is not as strong now, during the 'Bow Age'. This might support the theory that the "spongy feeling" is directly linked with the number of attachments to the canopy.

Not sure if the attempt of explanation is clear, or even correct, but that 's a try!

Excellent winds to All!!!



Fred