Robert, Can you post the panel lengths again, as the first 2 panels total approx 38" and with the tip it comes to nearly 46". Not really 2M. Thanks. Chris -----Original Message----- From: Robert Steinhaus <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Date: Friday, March 24, 2000 12:51 PM Subject: [RCSE] Re: Triple Taper Wings >In response to Mario Marzocchi’s post requesting help with triple taper wing >planform design I have put together a note including the following sample >wings and some web references which may help you understand wing planform >design a little better. > >I feel the following two triple taper wing designs are examples of good >planform. > >Wing Design - Joe Wurts Eagle AR=13.320 Area=933.60 >Suggested Airfoil RG15 (at least a few Eagles were built SD7003) > >Root Chord 24.77 cm (9.75") >Root Panel Length 63.0 cm (24.75") >First Break Chord 23.3 cm (9.187") >Mid Panel Length 61.0 cm (24") >Second Break Chord 17.6 cm (6.93") >Tip Panel Length 17.7 (7") >Tip Panel Chord 8.66 cm (3.41") > >The following 2+ meter span three panel wing is derived from the Joe Wurts >Eagle and has similar lift efficiency and aspect ratio. The tip chord is >slightly larger than it would be if you linearly scaled the Wurts Eagle >Wing. This was done to try to improve handling and tip stall (especially low >speed/landing) on this smaller wing. > >Wing Design Two - AR=13.20 - Smaller Span and Proportionally Larger Tip >Chord >RG15 Root with RG15 Tips > >Root Chord 21 cm (8.3") >Root Panel Length 51.79 cm (20") >First Break Chord 20 cm (7.9") >Mid Panel Length 46.58 cm (18.34") >Second Break Chord 15 cm (5.9") >Tip Panel Length 20.7 (8.15") >Tip Panel Chord 10.8 cm (4.25") > >RG15 is used for Root through Tip.. No geometric washout >(twist) is used on this wing. > >If you have not already downloaded a copy of John Hazel’s fine LiftRoll.xls >spreadsheet you should do so. This fine quality free tool helps >evaluate local lift distribution and is valuable when comparing/evaluating >wing planforms. > >http://homepage.altavista.com/johnhazel/downloads.html > > >The following two web resources may help you understand better the process >of designing a wing with good planform and lift efficiency. > >THE INFLUENCE OF PLANFORM AND AIRFOIL ON THE >DESIGN OF HIGH PERFORMANCE SAILPLANE WINGS WITH >VERY HIGH ASPECT RATIO (LOW RE-NUMBERS) >by Klaus Holighaus > >http://www.iac.net/~feguy/soaring_symposia/71-wvu.html > > >Applied Aerodynamics: >A Digital Textbook > >http://www.desktopaero.com/appliedaero/appliedaero.html > > >______________________________________________________ >Get Your Private, Free Email at http://www.hotmail.com > >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
