DS21
New! Bulk download of polars in Excel format: DS21.xlsx
Info | DAT and DXF files | Shape | Venkataraman Fit | Applications (0) | Similarly shaped airfoils
Plain Flapped Shapes: 25% flap chord | 30% flap chord | 35% flap chord | 40% flap chord
Basic Data: cl vs α | cd vs α | cm vs α | cl/cd vs α | cd vs cl | cl/cd vs cl | cl vs cd | cm vs cl | Curve fits | Lift curve slopes
Data source comparison (Codes, CFD, Wind tunnel)
Compressibility Effects: cl vs α | cd vs α | cm vs α | cl/cd vs α | cd vs cl | cl/cd vs cl | cl vs cd | cm vs cl
Roughness Effects: cl vs α | cd vs α | cm vs α | cl/cd vs α | cd vs cl | cl/cd vs cl | cl vs cd | cm vs cl
Plain Flap Effects: cl,max vs flap deflection: all flap chords | 25% flap chord | 30% flap chord | 35% flap chord | 40% flap chord
Plain Flap Effects: cl vs α for various flap deflections: 25% flap chord | 30% flap chord | 35% flap chord | 40% flap chord
Plain Flap Effects: cm vs α for various flap deflections: 25% flap chord | 30% flap chord | 35% flap chord | 40% flap chord
Plain Flap Effects: cd vs α for various flap deflections: 25% flap chord | 30% flap chord | 35% flap chord | 40% flap chord
Disclaimer: All information presented herein is delivered without guarantee or warranty of any kind. The user assumes the entire risk of use of this information.
DB Name: DS21
Family: Uncategorized
Max thickness: 8.6% at x = 28.24% chord
Max camber: 1.8% at x = 41.73% chord
Available data sources:
JavaFoil+Calcfoil stall+Eppler ext transition
XFOIL ncrit=9
Notes:
Coordinates from TraCFoil.
Commercial use of the airfoil may be restricted by the designer's copyright.
By Joe Wurts.
http://www.rcgroups.com/forums/showthread.php?t=309550
"Here are coords for the ds19 and ds21.
The 19 is meant for lighter conditions. I originally designed it for Brian Mclean for the Extreme, which by Brians request, had performance rqmts for light condition slope flight. This drove the optimal performance to high Cl, low Re. The 21 is closely related, still good for fairly light air, but a bit better straight line performance.
For extreme DS speeds, there are better airfoils. These were meant to fill Brians desires, and seem to have met his criteria fairly well. It would be fun to develop the ultimate DS machine, I've just not had the motivation yet to work on one yet. Just takes time and money..."