So now we have almost gone full circle!
The shown sail below has the same mast position and 70° yard angle as the first sail I drew up in 2020. Now I have lowered the AR to 1.90 to hit about 40sqm. This sail is of the same planform as the one on my Ingeborg, only a bit bigger.
The advantage with this sail with 70° yard is that you get a tall sail for the mast length. The disadvantage is that the moderate mast balance brings the CE quite far away from the mast. This leads to higher sheet forces, but more important; when running before, the CE will sit well away from the centreline, and this makes helming harder in rising winds. The last sail I drew up for you, with AR = 2.24 illustrates the difference.
However, there is a trick which some have used with success: By using a running TP, Throat Parrel, and TL, Tackline, one can shift the boom forward at will, and thus bring the CE closer to the mast (and CL).
The next diagram shows how it looks with the sail (red) tilted 6° forward. This type of sail, with 10° boom rise, appears to be very well suited to this kind of tilting. This is made clearer by shoving a front view of the boat.
To make the system work, one will, as said, need two more running lines. In addition the batten parrels must be made with adequate length, and the mastlift needs a moderate re-arrangement.
Have a look.
Arne
(Full size diagrams under Arne's sketches, Section 8, photo19 and 20)