The carve gybe without planing: load the rail, sheet in, change feet and switch the rig in light wind – the stepping stone to the power gybe, step by step.
What is a non-planing carve gybe? A gybe in displacement mode (the board does not plane) in which you do not just start the turn with the sail but load the board's inside rail and steer it into the curve. It is the stepping stone to the power gybe, where later you plane all the way through.
The honest answer on difficulty: the fully planing power gybe is the sticking point of many windsurfing careers [7]. Nobody learning planing gybes manages to plane through immediately [1]. Many lose their power before the foot change on the run. The rest, clew-first sailing and the rig switch, can be practised 1:1 in light wind [1]. That is exactly what this intermediate step is for.
For context: the British RYA teaches carve gybing in its "Intermediate Windsurfing (Planing)" course or as a separate clinic and continues it in the "Advanced" course [5]. The RYA does not explicitly name a non-planing variant in its course descriptions; here it is a practice form based on the published gybe technique.
Where the skill sits in your learning chain: between the basic gybe and the fully planing power gybe lies the biggest gap in the gybe learning path. The non-planing carve gybe fills it: you practise rail work, foot change and rig switch at low speed, without planing and overpower stressing you. Learning planing and gybing at the same time overwhelms most people; separately it works much better.
Practically this means: you take calm days, a big board and practise only the parts that later sit inside the power gybe. Time per gybe is no problem here, because your board is drifting anyway. Look consciously at your footwork and the rig switch.
You measure progress not in speed but in cleanliness: straight course before the gybe, round arc, a sail that does not fall into the water.
Sail on a beam reach, sheet in and shift your weight back. Extend both arms and tense stomach and back into a straight posture [2]. Gybes should be started with plenty of speed so there is always enough, but not too much pressure in the sail [2].
Milestone: you can finish a fast gybe (whole turn by sail steering, switching only at the end) cleanly [1].
Put the back foot on the centreline in front of the rear strap; on boards with straps take the back foot out of the strap [3]. Now you can load the rail.
Slowly shift your weight to the inside rail by bending your knees and pressuring with the back foot. Keep the sail hand sheeted in until the sail feels powerless and you are heading straight downwind [3]. The pressure on the inside rail stays until you are on the new side. In the carving jibe you push the inside rail with the balls and toes of your feet and lean forward into the turn [4].
Important: if you open the sail while bearing away you get less pull, but the board stops turning to leeward. The sail hand moves back on the boom and the sail stays sheeted in [1].
Place the front foot, turned out, directly in front of the back foot so the feet form a "V", then bring the back foot, turned in, to the mast, both feet on the centreline, hip-width [2]. Your upper body stays facing the sail [2].
Slide the mast hand close to the mast, let go with the sail hand, guide the mast past your body, grab the other side and slowly sheet in [2]. Keep the rig close to your body when switching and the mast hand as close to the mast as possible, otherwise the sail falls into the water on the leeward side [1]. Then head up to a beam reach.
Milestone: 8 out of 10 gybes without the sail falling into the water.
Practise the gybe first in two halves: rail work down to the run, then stop, arrange feet, switch. Only when both halves work do you join them. That saves nerves and equipment.
In the basic gybe you swing the sail over the bow on an extended arm. In the carve gybe you actively steer the board over the inside rail into the turn and keep the pressure until the switch [1][4].
Yes, the technique building blocks of loading the rail, foot change and rig switch can be practised 1:1 in light wind. Planing all the way through comes later [1].
Usually the sail is too open. With an open sail there is less pull but also no turn. Move the sail hand back and sheet in fully [1].
A large, tippy-stable board with plenty of volume, ideally body weight plus 70 litres [1].
The Step Gybe in Windsurfing: The Easiest Power Gybe to Learn