Return-Path: Received: from marvkaye.olsusa.com ([205.245.9.196]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with SMTP id com for ; Wed, 17 Nov 1999 14:29:41 -0500 Message-Id: <3.0.3.32.19991117143407.00b67880@olsusa.com> Date: Wed, 17 Nov 1999 14:34:07 -0500 To: lancair.list@olsusa.com From: Marvin Kaye Subject: L-IV winglets X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Posted for "Mr Gary Burns" to eliminate dual formatting and assign subject: Hi, I would like to add a few comments on this subject. As the builder of the only certified Lancair IV in the world, these are the reason I had to fit winglets. 1.To achieve a 61knot stall speed for the Lancair IV at 3200 pounds, the extra wing area is required (61.2kts average with calibrated ASI) 2. To achieve the yaw roll couple required for certified IFR flight ( ie must be able to pick up a wing with rudder only) the winglets are required as they change the effective di hedral of the wing. Bonanzas , Mooneys etc do the same by having direct linkages between rudder & aileron control (interconnected). The aircraft is rock solid to hand fly at 29000 feet. When I flew around the world last year, no autopilot was fitted. The aircraft is definitely heavier in roll than aircraft I have flown with out winglets. I set a little toe out on the winglets in order ( 3 degrees) to gain a forward component of lift, therefore in theory not lose any speed. My a/c weighed 1958 pounds & on short runways I approached at 79kts (1.3 Vs).Hope this helps some one make the choice. Gary Burns VH-LKG www.squirrel.com.au/~alschenk >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html Builders' Bookstore: http://www.buildersbooks.com/lancair >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>