<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
         <<  Lancair Builders' Mail List  >>
         <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>

Posted for "Mr Gary Burns" <gkburns@bigpond.com> 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