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Hi TM!
There is also the Tree Austria III, with an optional seat.
The Komet Dragonfly is the seated version of the Butterfly.
The Weaver Cougar now has a seat available.
And the Ergovation now also has a seat option too.
Then of course, Buckinghams Versatile, Pinnacle & Traverse models.
Can't wait for the Swing though....
Trev
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Hi Trev. I'm not talking about OPTIONAL seats. If that were the case, you could buy a
Petzl Podium and turn any saddle on the planet into a bosun seat saddle. Or fashion a 1x4, for that matter.
But it doesn't work that way.
The leg straps, to effectively not pinch, squeeze or compress needs to be integrated into the seat itself. The seat needs to be integrated into the bridge in a manner that it's basically a big loop with a flat run that is the underside of the seat.
If you're doing a hard, right-side horizontal maneuver, and you have a floating bridge (not a fixed center) the point above your left hip is the suspension point, the seat is oriented vertically and your right hip is cradled in the strap coming from back to front. The leg straps are holding the seat in place, the forces are on the lowest part of the saddle (right hip). Any leg strap forces are from your weight shifting right (that is, downward, since you are horizontal) rather than the leg straps being pulled upward in the direction of the rope, and compressing the legs.
Butt boards are great for prolonged suspension on rope, as they are often touted, but the bosun-to-bridge continuous construction does a lot to allow the same style of movement as leg strap saddles, only without the stresses on the thighs coming from the pulling tension of the leg straps. The forces are generally from below, under your butt, which spares your upper thighs and hence the legstraps are therefore not being pulled upward into the nether regions when you sit back on a tensioned rope, or when you go from sit-back to vertical-upright, as in footlocking.
I hope this helps a bit in understanding the differences.