Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!philabs!seismo!hao!hplabs!sri-unix!Mary.Shaw@CMU-CS-A From: Mary.Shaw%CMU-CS-A@sri-unix.UUCP Newsgroups: net.aviation Subject: Schweizer sailplane wing loadings Message-ID: <2883@sri-arpa.UUCP> Date: Thu, 14-Jul-83 00:17:00 EDT Article-I.D.: sri-arpa.2883 Posted: Thu Jul 14 00:17:00 1983 Date-Received: Mon, 11-Jul-83 20:16:53 EDT Lines: 24 Here are some numbers for Schweizer sailplanes. Schweizer is the dominant American manufacturer, and most rentals in this country come from this list: MODEL MAX WING WING WING GLIDE RATIO GR WT AREA LOADING SPAN L/D @ speed (lb) (sq ft) (lb/sqft) (ft) (ratio) (mph) 2-33 1040 219 4.75 51 23:1 @ 50 (std 2-place trainer) 1-26E 700 160 4.38 40 23:1 @ 53 2-32 1430 180 7.94 57 34:1 @ 66 1-34 840 151 5.56 49 34:1 @ 55 1-35 930 104 8.94 49 39:1 @ 47 1-36 710 140 5.05 46 31:1 @ 53 They are rated for loads from about -2.5 or -3g to around +5g. However, a "progressive-failure" design allows them to hang together under much higher stress. Last weekend I got a look at one that had had its wing roots twisted about 30 degrees and structural rivets sheared. In addition, the seat failed and there was structual damage to the fuselage. The pilot had dived about 2000 ft at high speed and done a sharp pullup; the factory estimated that it would take 11g forces to do the damage. Mary Shaw