Quobba Fins for Kitesurfing
Disclosure - I drink beer and kite with the owners son RY.
So I surf and also kite on these fins and as most people know me I will ride what I like and not what I don't. I have been riding and testing these fins for over a year.
The Tech- the fins have a small foil wrapped around the base which is designed to create some lift and drive. They are made of glass and hi tensile polymer. As the the Quobba saying is 'The faster you go, the faster you' this rings true on these fins.
Benefits I found for kiting Extra percentage drive upwind - when tacking I found the fins help with a slight drive and extra angle going upwind. I would say it might improve upwind distance by about 10-15%. (Yes I have tested this for the peanuts on here

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When travelling fast and carving the fins like to turn corners and have a nice hold through turns where other flatter fins let go which definitely is an advantage because we go faster on a kite than normal surfing. Theres an extra drive that squirts through the end of your turns.
Negatives They catch seaweed a bit more than a normal fin
They come in Medium and Large sizes (I am 95KG and ride the larges. I would say if you are 80KG or less go the mediums. Also they come in FCS, Futures and multi box.
Airton and James Carew number 1 & 2 in the world both ride Quobbas purely by choice which sais allot for the fins.
I would suggest demo a set from Action Sports as I know they are stocking loan fins just to see if you feel the difference and also if they suit your riding before dropping in. Hopefully that was a helpful review see you on the water.