No such thing as a free lunch - the rounded tip's reduce the poplar moments of inertia around the longitudinal axis - compared with the Hershey bar wing (constant chord - squared tip) which mean's lite and responsive ailerons. In fact @ Va the coupe is rather a delight to fly and light on the controls Increase the area of both wing and ailerons and we would lose some of this maneuverability As far as the Elliptical wing is concern it's about span wise load distribution - which is evenly distributed - where the constant chord wing achieves it's equilibrium (centriod) at about 44% of span (measured out from the root) -----Original Message----- From: Roy D. Stubbs II [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 18, 2002 2:58 PM To: Percy Wood Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; [email protected] Subject: RE: [COUPERS-TECH] STOL
----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- See Peter Garrison's "Technicalities" in January 2003 Flying for interesting discussion of optimum wing shapes and the Hershey Bar. Roy in Woodstock -----Original Message----- From: Percy Wood [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 18, 2002 2:48 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; [email protected] Subject: Re: [COUPERS-TECH] STOL At 07:57 PM 12/17/02 -0500, [EMAIL PROTECTED] wrote: pointing out that the hershey bar Cherokee wing is almost optimum for performance....but maybe not looks.... The rectangular wing attains the best performance and cost of construction because in performance it atttains the optimum shape for a wing which seems to be an elipse. I had read somewhere that the Spitfire, of Battle of Britain fame, was a supurb plane because of the eliptical wing. That wing is also hard to make because you can only do two ribs the same - one on each side! Granted that the "Hershey Bar" wing is not the worse, it probably is the cheapest to build. One of the things Fred Weick did at Piper was show that metal construction was less costly than fabric cover. That was what convinced Pug to build the Cherokee. Percy in Portland ========================================================================== ===To leave this forum go to: http://ercoupers.com/lists.htm
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