I think the confusion between gybing to the inside or to the outside of the forestay lies in where the head of the sail is attached.
With my masthead rig, before I had a block mounted to the spinnaker crane, I used a 2nd genoa halyard to hoist my old sym spinnaker (I know, not the best way to do it). I didn't have a pole so I attached the tack to the forestay on a carabineer (which functioned similar to the ATN Tacker) with a downhaul for height adjustment. Because the head of the spinnaker was inside the forestay, naturally, I could only gybe to the inside, like a genoa, otherwise the head would wrap on the forestay if I gybed by flying the clew to the outside.
If I were to set up exactly the same way, except with the head attached to a spinnaker halyard running through the block on the spin crane, then I would have to gybe to the outside to avoid wrapping the head on the forestay because the crane is mounted over the stay.
I'm guessing that most are using a crane over the forestay, especially if you have fractional rig. In that case, the clew has to fly to the outside in a gybe. I think it has nothing to do with the ATN Tacker, which should be able to rotate either direction, inside or outside. I haven't watched the video, but my guess is that by gybing with the clew to the inside, they are using a genoa halyard and the head has to rotate inside the stay to avoid a wrap.
If you are using a sprit, I don't see how you can avoid gybing to the outside. In this case, doesn't the head of the sail have to be outside the stay, just like the tack is? I suppose you could pull it off by passing the clew between the luff and the stay, but it would seem far easier to simply gybe to the outside.
With my masthead rig, before I had a block mounted to the spinnaker crane, I used a 2nd genoa halyard to hoist my old sym spinnaker (I know, not the best way to do it). I didn't have a pole so I attached the tack to the forestay on a carabineer (which functioned similar to the ATN Tacker) with a downhaul for height adjustment. Because the head of the spinnaker was inside the forestay, naturally, I could only gybe to the inside, like a genoa, otherwise the head would wrap on the forestay if I gybed by flying the clew to the outside.
If I were to set up exactly the same way, except with the head attached to a spinnaker halyard running through the block on the spin crane, then I would have to gybe to the outside to avoid wrapping the head on the forestay because the crane is mounted over the stay.
I'm guessing that most are using a crane over the forestay, especially if you have fractional rig. In that case, the clew has to fly to the outside in a gybe. I think it has nothing to do with the ATN Tacker, which should be able to rotate either direction, inside or outside. I haven't watched the video, but my guess is that by gybing with the clew to the inside, they are using a genoa halyard and the head has to rotate inside the stay to avoid a wrap.
If you are using a sprit, I don't see how you can avoid gybing to the outside. In this case, doesn't the head of the sail have to be outside the stay, just like the tack is? I suppose you could pull it off by passing the clew between the luff and the stay, but it would seem far easier to simply gybe to the outside.
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