Sig riser is a 2 meter class sailplane  I built from a kit  sold by Sig Mfg..  It is of traditional balsa construction, with surfaces covered with transparent Ultracote.  Wing Span is 78 inches and wing area is 620 square inches or 4.31 square feet.  Weight is 31 ounces.  Wing loading is 7.18 ounces/square foot, and cube loading is 3.46 ounces/cubic foot. The Riser competes with other "Woodies", like the Goldberg Gentle Lady, but is heavier than more modern composite 2 Meter Sailplanes.  I have flown it at the S.O.A.R. sod farm flying site.  I launched it with a bungee style launcher using a stretched Latex tube for power.