Return-Path: Received: from slkcpop3.slkc.uswest.net ([206.81.128.3]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with SMTP id com for ; Tue, 5 Oct 1999 10:14:38 -0400 Received: (qmail 27153 invoked by alias); 5 Oct 1999 14:18:39 -0000 Received: (qmail 27146 invoked by uid 0); 5 Oct 1999 14:18:38 -0000 Received: from pppdsla7.slkc.uswest.net (HELO scottdah) (216.160.232.7) by slkcpop3.slkc.uswest.net with SMTP; 5 Oct 1999 14:18:38 -0000 Delivered-To: fixup-lancair.list@olsusa.com@fixme From: "Scott Dahlgren" To: "___Lancair list" Subject: zigzag tape Date: Tue, 5 Oct 1999 08:21:08 -0600 Message-ID: <001901bf0f3c$de0b4c40$0200000a@scottdah> Importance: Normal X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Bo Thisted, the zigzag tape you got is called "turbulator tape". It helps to trip the turn-back flow under the front of the leading edge, improving laminar flow across the entire top of the wing. Mike Campbell claimed a 6 knot improvement in speed in a article in the august 94 edition of "sport aviation". Where you put it is critical. Too deep under the tip and you will be out of the turn-back flow. too close to the leading edge and you will trip the main flow over the top of the wing and that is very bad (high stall speed, high drag, or worse). you can find the turnback flow region by putting oil under your leading edge and studying the air pattern after a flight, or copy another builders location that works well. Scott Dahlgren >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html