Crude simulation for free standing mast - sail - luff curve ?

Today = measurements. I set-up something roughtly representative of sailing geometry. I sheeted "hard" to see if a kink in the mast shape appears => not really. See pictures. I also measured the curve at 25% (bottom), 50% and 75% (top). 18,5cm ; 25 cm ; 19 cm. This makes 74% ; 100% ; 77%.

This mast is quite soft at the bottom compared to windsurf mast ! At the bottom, windsurf masts are normally 62-64% and top in 76-82%

Sail curve is 25% 10.4cm ; 50% 13 cm ; 75% 7 cm. Max curve is at about 42% height

 

Reboot. Post above showed that the mast curve was "smooth", and without kink. Went back to the sail/mast fit (back to basics). In order to better understand the tensions in the sail, I removed battens. Clearly too much bend at second batten, which matches the problematic areas. Similar issue, but less important at another joint above. I have read somewhere that this also makes the leach open. See first picture.

I also did similar tests using a windsurfing mast. Much better on the top part. A bit too much volume at the bottom. See second picture.

I will try see the sail flying shape with the windsurf mast...