Blended Winglets on an E-Racer Canard Aircraft
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1 Blended Winglets on an E-Racer Canard Aircraft Performance Increase? Marc J. Zeitlin / Jack Morrison July 26 th, :30 PM 3:45 PM Forum Tent 06 Sporty s Pavilion July 19, 2007 Canard Forum Slide Show Slide #1
2 What Will I Talk About? Introduction Who Am I? Who s Plane Is It? Consulting Process Aerodynamics of Canard Aircraft Winglets Modification Process Aircraft Configuration Before / After Aircraft Testing Aircraft Performance Before / After Performance Graphs Other Performance Differences? Extension to Other Canard Aircraft? Questions and Answers July 19, 2007 Canard Forum Slide Show Slide #2
3 Who The Heck Am I? Biography / Resume' Loved planes since 3 years old - Built zillions of model aircraft Thesis - Design, Construction and Testing of an Electromagnetically Launched Model Glider Built Quickie Q2 Built COZY MKIV #386, N83MZ ~500 flying hours Started / Administer Unofficial COZY Builders Web Page and COZY Mailing List Work for Scaled Composites as Mechanical Engineer in charge of transitioning SS2/WK2 from prototype to production by The Spaceship Company Do Homebuilder Aircraft consulting for folks I like on the side July 19, 2007 Canard Forum Slide Show Slide #3
4 Who s Plane Is It? Jack Morrison s E-Racer Built 1996 Lindy Award winner OSH 2000 Over 300 hours on airframe July 19, 2007 Canard Forum Slide Show Slide #4
5 Who s Plane Is It? July 19, 2007 Canard Forum Slide Show Slide #5
6 Consulting Process Jack approached me for engineering assistance with winglet modification he had a couple of ideas Wanted blended winglet like thought would provide drag reduction Discussed two approaches for mods settled on one Determined modification process removal of old winglets wing preparation fabrication of new winglets attachment of new winglets Ensure adequate strength/stiffness Discussed appropriate flight testing after modifications July 19, 2007 Canard Forum Slide Show Slide #6
7 Aerodynamics of Canard Aircraft Winglets Nominally Whitcomb winglets, BUT Not used for L/D improvement (efficiency) as on commercial airliners and gliders Merely convenient place for vertical stabs/rudders Lower winglet on LE/COZY has aerodynamic purpose, but not pertinent to this issue Intersection not optimal lots of separation drag E-Racer intersection especially nonoptimal drag-wise (looks good, though) more room for improvement with E-Racer E-Racer Long-EZ / COZY July 19, 2007 Canard Forum Slide Show Slide #7
8 Modification Process - #1 bar Foam July 19, 2007 Canard Forum Slide Show Slide #8
9 Modification Process - #2 July 19, 2007 Canard Forum Slide Show Slide #9
10 Aircraft Configuration - Before Standard E-Racer Airframe First flew 1996 with Chevy 4.9L V6 Supercharged engine Changed to IO Supercharged with Auto Ignition system Retractable gear per E-Racer plans Stock E-Racer winglets July 19, 2007 Canard Forum Slide Show Slide #10
11 Aircraft Configuration - After New Paint New Winglets That s it Easy to compare only one major aerodynamic change July 19, 2007 Canard Forum Slide Show Slide #11
12 Aircraft Testing Tuft Testing notice attached flow in intersection region tufts flowing straight back Speed / Performance Testing Stall Testing July 19, 2007 Canard Forum Slide Show Slide #12
13 Aircraft Performance RPM Original Winglets Pre-Blend MP IAS Pre-Blend TAS Normalized Power (%) RPM Blended Winglets Blended MP IAS Blended TAS Speed vs. Power NORMALIZED power settings (NOT % power available!!!) Highest power USED in testing set to 100%, just for comparison purposes Normalized Power (%) July 19, 2007 Canard Forum Slide Show Slide #13
14 Performance Graphs Blended winglets on E-Racer provide ~10 kt. TAS increase at equivalent power settings ~ Equivalent to wheel pants on L.E. / COZY Greater than gear leg fairings on L.E. / COZY Linear Curve fit NOT accurate, just allows for simple comparison need more data points for polynomial fit TAS TAS vs. Normalized Power 220 Pre-Blend TAS 215 Blended TAS 210 Linear (Pre-Blend TAS) Linear (Blended TAS) NORMALIZED Pow er (%) July 19, 2007 Canard Forum Slide Show Slide #14
15 Other Performance Diffs. None No major flight characteristic changes No pitch, roll, yaw issues No stall differences July 19, 2007 Canard Forum Slide Show Slide #15
16 Extension to Other Canard Aircraft? LE/VE maybe Standard aircraft probably not fast enough to see much advantage Better winglet intersection than E-Racer to start with leaves less room for improvement CG issues possibly not AS sensitive to lower winglet disappearing Might be more work than it s worth, but could gain a few 2 to 4 kts. Berkut most likely candidate Fast enough to get advantage Better winglet intersection than E-Racer to start with leaves less room for improvement but CG issues possibly not AS sensitive to lower winglet disappearing Could be worth a try might gain 5 to 10 kts. COZY III/MKIV (and other 3/4-seat canards) NOT RECOMMENDED Need a great deal of experimentation on CG issues / lower winglet loss compatibility Standard aircraft probably not fast enough to see much advantage Better winglet intersection than E-Racer to start with leaves less room for improvement Probably 2 to 4 kts. max. gain Concomitant deep stall issues at the slow end due to lower winglet disappearance July 19, 2007 Canard Forum Slide Show Slide #16
17 Questions? (& Answers) My Jack s N345JM@comcast.net My Website: July 19, 2007 Canard Forum Slide Show Slide #17
Marc J. Zeitlin July 26 th, :30 PM 3:45 PM Forum Tent 06 Sporty s Pavilion. Rutan Derivative Canard Forum Slide #1
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