A friend (schooled in avionics) and a former crew mate ones asked me :"What is the difference between a winglet and a zero angle of attack wingtip"

The question was retorical and I understood what he meant.

Basically wingtip can also be had by adding a zero angle of attack wingtip on top and in line of the active wing section. On cats we approximate this by letting the tops twist off.

This is also to most simple method of descreasing wing top vortex on A-cats as they don't have a mast length limit.

Wouter