B&R Rig
The aft swept spreaders and no backstay are characteristics of the B&R rig. (B&R are the initials of the designers who popularized the concept.) It is absolutely structuraly sound to support a mast from 3 points instead of 4. Look at guyed communications towers, they all have guy wires on just 3 sides and they can be well over 1,000' tall. So structural integrity should not be your worry.The real question is sailability. No running backstay means you can't use that technique for flattening the sail. The aft swept spreaders mean you can't wing the boom out to 90 degrees. However, no backstay means you can have a nice full roach main, which is the aerodynamic shape of choice. For cruising, I like the B&R. For racing, the traditional rig is probably better.Ron MehringerH26 Hydro-Therapy