That 29erXX started with the same hull shape as todays 29er with a twin spreader rig, mast head kite, and twin wires.
What then happened was the boat was refined and re-targeted, probably very appropriately at the youth market, yet the existence of that rig along with another was known to a few and sailing quite regularly.
As the 29er grew, so did the demand for a stepping stone to the bigger, faster 49er. Initially a small 49er rig was trialled, the rig, but that was not quite right. The 29er sailors wanted there own boat, a supped up 29er, not a dumbed down 49er.
As technology developed and lending a lot from the 59er development, came the original 29erXX rig.
