Monty Spindler is working on sail designs for many years and again created an incredible Slalom weapon. Ben van der Steen could finish the 2011 PWA season in third position overall. In the following video Monty talks about RDM and SDM masts and gives some recommendations, which kind of mast diameter could work better for specific body weights. Thanks to the Cutre Shop from Pozo Izquierdo for filming following clip.