For reefing, the maneuver consists of reducing the surface of the mainsail, it is a maneuver which is carried out when the wind conditions are strong, that is to say when there are significant forces on the boat, it is necessary therefore be particularly vigilant. The transitional phase consists of reducing the mainsail. To do this, the navigator starts by putting the mainsail in line with the wind, then takes up the reefing line while releasing the mainsail halyard. During this maneuver, there is a particular risk that a slider will jam, which could tear the mainsail. Thus, visual inspection and control of the forces exerted on the crank are very important for this maneuver. During this transitional phase of the maneuver, the efforts involved are limited and if something gets stuck the navigator quickly feels resistance, which nevertheless remains of a much lower intensity than the torque he needs to trim the mainsail.

When a sailor furls a headsail, it's still another level of effort that is engaged. There are also dangerous jamming situations for the equipment and the navigator must feel both the efforts involved and the limits beyond which a risk of equipment breakage is probable.

For the transfer of on board the genoa, the maneuver consists of releasing the leeward sheet, followed by resuming the sheet on the other tack at the same time as the boat passes head to wind, the genoa passes then on the other tack and the navigator gradually edges the genoa.

When hoisting a spinnaker, a jamming situation can also appear , for example when the halyard loop gets stuck on a sheave, or the halyard gets caught in a spreader bar. Detecting abnormally high effort is important to avoid breakage. During this maneuver, several sources of problems are also possible: a sheet can make a knot at the entrance to the pulley of the sheet carriage and get stuck, a sheet can get stuck on a mast step or other spar on the deck, etc. If something gets stuck and the browser starts to pull heavily on the sheet, hardware may break.

Also, besides the phase transient, the forces also vary in the final adjustment phase. For example, for raising the mainsail, reefing or hoisting a spinnaker, these maneuvers end with tightening the halyard. The efforts are then very significant and there is almost no risk of breakage. In this final phase, the sailor mainly seeks to precisely adjust the level of tension on the sail with the required force, often very significant. For tacking, the final phase consists of tacking to adjust the tension of the sail, the efforts involved are then very significant although often less important than for trimming the mainsail in strong winds.