We have moved on now, but the very first Blade F16's (australia) used a 49-er track as well. All the Blades still use two glass pilons to hold the track. If you design them robust enough then they will hold and not crack. Both pilons are at the end of the curved track. This setup works especially when the track is relatively short. If you use the 49-er track then that rail is of the I-track type and no modification to the track is needed. If you really want to use the much less tall recirculating ball tracks (I dislike them with a passion) then you will have to bend a piece of rectangular Alu tube and fit the track to that. This footing will make the track strong enough to handle the loads when it is only supported at the ends. But I-track is best, simple, cheap and won't jam with sand or dirt.



I think the earlier nacra glass track base was a little to much engineered to low weight. If you have a round beam then a two pilon setup may well be an advantagious one. You do have to align these well with the arc of the jib though.

Wouter