A Photo & Discussion Forum for Wharram Design Enthusiasts
I found your post as part of the search function on this site. Wingsail discussion is back again !
It was your comment -" but my low speed aerodynamics theory shows the "slot effect" between the mast & the sail is actually beneficial aerodynamically"- that I found very interesting.
I have never met this theory - but it is in fact what the Galway Hookers [gaff rig ] do. The main is laced closer to the mast for normal use to depower it and farther back to power it up for racing.
Seems perhaps the best is no gap as in a wing or close fitting track or next is a large gap? With the smaller gap being the worst of both worlds ?
I have no theoretical basis whatever for this in fact it has always puzzled me. But it seems to be true.
Couldn't you get the best of both worlds with both
1. synthetic lacing for ease of raising and lowering, combined with
2. woven Teflon fabric for the luff pocket for the wingsail aerodynamic effect.
I did a search recently an found a mill that makes what appeared to be suitable weight and strength woven Teflon fabrics