Xfoil polar. Reynolds number fixed. Mach number fixed Polar key,xf-naca0021-il-200000 Airfoil,naca0021-il Reynolds number,200000 Ncrit,9 Mach,0 Max Cl/Cd,47.9937 Max Cl/Cd alpha,8.75 Url,http://airfoiltools.com/polar/csv?polar=xf-naca0021-il-200000 Alpha,Cl,Cd,Cdp,Cm,Top_Xtr,Bot_Xtr -19.500,-1.1826,0.09047,0.08413,-0.0463,1.0000,0.0897 -19.250,-1.2047,0.08434,0.07776,-0.0489,1.0000,0.0910 -19.000,-1.2278,0.07832,0.07145,-0.0514,1.0000,0.0922 -18.750,-1.2032,0.07853,0.07184,-0.0504,1.0000,0.0941 -18.500,-1.1961,0.07650,0.06982,-0.0509,1.0000,0.0958 -18.250,-1.1992,0.07318,0.06640,-0.0518,1.0000,0.0975 -18.000,-1.2090,0.06910,0.06214,-0.0531,1.0000,0.0993 -17.750,-1.2212,0.06488,0.05769,-0.0542,1.0000,0.1009 -17.500,-1.2022,0.06431,0.05727,-0.0537,1.0000,0.1031 -17.250,-1.1971,0.06218,0.05513,-0.0539,1.0000,0.1052 -17.000,-1.1989,0.05930,0.05214,-0.0544,1.0000,0.1074 -16.750,-1.2067,0.05590,0.04852,-0.0549,1.0000,0.1094 -16.500,-1.1937,0.05462,0.04733,-0.0545,1.0000,0.1119 -16.250,-1.1864,0.05287,0.04559,-0.0544,1.0000,0.1142 -16.000,-1.1842,0.05064,0.04328,-0.0543,1.0000,0.1168 -15.750,-1.1871,0.04802,0.04047,-0.0542,1.0000,0.1192 -15.500,-1.1747,0.04673,0.03926,-0.0537,1.0000,0.1220 -15.250,-1.1677,0.04512,0.03766,-0.0533,1.0000,0.1248 -15.000,-1.1645,0.04322,0.03567,-0.0528,1.0000,0.1278 -14.750,-1.1623,0.04128,0.03358,-0.0521,1.0000,0.1308 -14.500,-1.1497,0.04012,0.03253,-0.0515,1.0000,0.1340 -14.250,-1.1433,0.03864,0.03102,-0.0507,1.0000,0.1373 -14.000,-1.1397,0.03701,0.02926,-0.0497,1.0000,0.1408 -13.750,-1.1282,0.03582,0.02813,-0.0488,1.0000,0.1443 -13.500,-1.1203,0.03459,0.02690,-0.0477,1.0000,0.1480 -13.250,-1.1145,0.03330,0.02552,-0.0464,1.0000,0.1520 -13.000,-1.1045,0.03217,0.02440,-0.0451,1.0000,0.1560 -12.750,-1.0959,0.03114,0.02341,-0.0436,1.0000,0.1600 -12.500,-1.0895,0.03011,0.02230,-0.0418,1.0000,0.1645 -12.250,-1.0801,0.02915,0.02135,-0.0401,1.0000,0.1690 -12.000,-1.0725,0.02831,0.02055,-0.0380,1.0000,0.1734 -11.750,-1.0675,0.02752,0.01969,-0.0354,1.0000,0.1783 -11.500,-1.0603,0.02674,0.01895,-0.0329,1.0000,0.1830 -11.250,-1.0561,0.02610,0.01835,-0.0298,1.0000,0.1876 -11.000,-1.0548,0.02555,0.01774,-0.0261,1.0000,0.1926 -10.750,-1.0521,0.02497,0.01719,-0.0224,1.0000,0.1974 -10.500,-1.0534,0.02452,0.01680,-0.0179,1.0000,0.2019 -10.250,-1.0585,0.02419,0.01642,-0.0126,1.0000,0.2066 -10.000,-1.0652,0.02387,0.01607,-0.0069,1.0000,0.2110 -9.750,-1.0728,0.02355,0.01583,-0.0011,1.0000,0.2152 -9.500,-1.0784,0.02330,0.01558,0.0045,1.0000,0.2200 -9.250,-1.0798,0.02308,0.01526,0.0093,1.0000,0.2254 -9.000,-1.0772,0.02265,0.01495,0.0132,1.0000,0.2309 -8.750,-1.0743,0.02239,0.01469,0.0172,1.0000,0.2371 -8.500,-1.0406,0.02193,0.01426,0.0153,0.9958,0.2467 -8.250,-1.0014,0.02161,0.01391,0.0124,0.9914,0.2577 -8.000,-0.9676,0.02111,0.01352,0.0106,0.9852,0.2676 -7.750,-0.9285,0.02075,0.01314,0.0078,0.9800,0.2791 -7.500,-0.8926,0.02036,0.01282,0.0057,0.9742,0.2901 -7.250,-0.8568,0.01993,0.01244,0.0037,0.9675,0.3012 -7.000,-0.8148,0.01961,0.01207,0.0006,0.9633,0.3140 -6.750,-0.7844,0.01919,0.01179,-0.0002,0.9549,0.3247 -6.500,-0.7448,0.01880,0.01142,-0.0027,0.9495,0.3372 -6.250,-0.7005,0.01845,0.01107,-0.0062,0.9463,0.3509 -6.000,-0.6726,0.01808,0.01081,-0.0063,0.9364,0.3617 -5.750,-0.6312,0.01769,0.01043,-0.0090,0.9317,0.3752 -5.500,-0.5890,0.01729,0.01007,-0.0118,0.9282,0.3888 -5.250,-0.5649,0.01698,0.00984,-0.0110,0.9167,0.3996 -5.000,-0.5284,0.01663,0.00944,-0.0125,0.9110,0.4132 -4.750,-0.5013,0.01630,0.00924,-0.0121,0.9009,0.4244 -4.500,-0.4704,0.01596,0.00889,-0.0124,0.8925,0.4370 -4.250,-0.4429,0.01569,0.00867,-0.0120,0.8828,0.4490 -4.000,-0.4151,0.01537,0.00839,-0.0117,0.8725,0.4608 -3.750,-0.3892,0.01516,0.00815,-0.0109,0.8616,0.4733 -3.500,-0.3617,0.01487,0.00794,-0.0104,0.8506,0.4849 -3.250,-0.3370,0.01470,0.00772,-0.0095,0.8382,0.4975 -3.000,-0.3091,0.01445,0.00752,-0.0090,0.8271,0.5094 -2.750,-0.2848,0.01429,0.00737,-0.0080,0.8134,0.5217 -2.500,-0.2571,0.01412,0.00718,-0.0075,0.8021,0.5346 -2.250,-0.2326,0.01398,0.00709,-0.0066,0.7875,0.5465 -2.000,-0.2073,0.01389,0.00694,-0.0057,0.7744,0.5600 -1.750,-0.1801,0.01375,0.00684,-0.0052,0.7614,0.5721 -1.500,-0.1557,0.01368,0.00675,-0.0043,0.7468,0.5853 -1.250,-0.1288,0.01360,0.00668,-0.0037,0.7340,0.5982 -1.000,-0.1032,0.01353,0.00661,-0.0029,0.7197,0.6110 -0.750,-0.0783,0.01351,0.00657,-0.0020,0.7057,0.6251 -0.250,-0.0264,0.01344,0.00651,-0.0006,0.6782,0.6516 0.000,0.0000,0.01344,0.00652,0.0000,0.6650,0.6650 0.250,0.0264,0.01344,0.00651,0.0006,0.6515,0.6782 0.750,0.0783,0.01351,0.00657,0.0020,0.6251,0.7057 1.000,0.1032,0.01353,0.00661,0.0029,0.6110,0.7197 1.250,0.1288,0.01360,0.00668,0.0037,0.5982,0.7340 1.500,0.1557,0.01368,0.00675,0.0043,0.5853,0.7468 1.750,0.1801,0.01375,0.00684,0.0052,0.5721,0.7614 2.000,0.2073,0.01389,0.00694,0.0057,0.5600,0.7744 2.250,0.2326,0.01398,0.00709,0.0066,0.5465,0.7875 2.500,0.2571,0.01412,0.00718,0.0075,0.5346,0.8021 2.750,0.2848,0.01429,0.00737,0.0080,0.5217,0.8134 3.000,0.3091,0.01444,0.00752,0.0090,0.5094,0.8271 3.250,0.3371,0.01470,0.00772,0.0095,0.4975,0.8383 3.500,0.3617,0.01486,0.00793,0.0104,0.4849,0.8506 3.750,0.3893,0.01516,0.00815,0.0109,0.4733,0.8616 4.000,0.4151,0.01537,0.00839,0.0116,0.4608,0.8725 4.250,0.4429,0.01568,0.00866,0.0120,0.4490,0.8828 4.500,0.4704,0.01595,0.00889,0.0124,0.4370,0.8925 4.750,0.5013,0.01630,0.00924,0.0121,0.4244,0.9009 5.000,0.5284,0.01663,0.00944,0.0125,0.4132,0.9110 5.250,0.5649,0.01697,0.00983,0.0110,0.3996,0.9167 5.500,0.5891,0.01728,0.01007,0.0118,0.3888,0.9282 5.750,0.6313,0.01769,0.01042,0.0090,0.3752,0.9318 6.000,0.6726,0.01808,0.01081,0.0063,0.3617,0.9365 6.250,0.7006,0.01845,0.01106,0.0062,0.3509,0.9463 6.500,0.7449,0.01880,0.01142,0.0027,0.3372,0.9496 6.750,0.7845,0.01919,0.01178,0.0002,0.3247,0.9550 7.000,0.8149,0.01961,0.01207,-0.0006,0.3139,0.9633 7.250,0.8569,0.01992,0.01244,-0.0038,0.3012,0.9676 7.500,0.8926,0.02035,0.01281,-0.0057,0.2901,0.9743 7.750,0.9287,0.02074,0.01313,-0.0079,0.2790,0.9801 8.000,0.9678,0.02110,0.01351,-0.0106,0.2676,0.9853 8.250,1.0017,0.02160,0.01390,-0.0124,0.2577,0.9915 8.500,1.0409,0.02192,0.01425,-0.0153,0.2466,0.9959 8.750,1.0741,0.02238,0.01468,-0.0171,0.2371,1.0000 9.000,1.0770,0.02264,0.01494,-0.0132,0.2309,1.0000 9.250,1.0797,0.02306,0.01524,-0.0093,0.2254,1.0000 9.500,1.0783,0.02329,0.01557,-0.0045,0.2200,1.0000 9.750,1.0729,0.02354,0.01582,0.0010,0.2152,1.0000 10.000,1.0653,0.02386,0.01606,0.0069,0.2110,1.0000 10.250,1.0586,0.02418,0.01641,0.0126,0.2066,1.0000 10.500,1.0536,0.02451,0.01678,0.0179,0.2019,1.0000 10.750,1.0524,0.02495,0.01718,0.0223,0.1974,1.0000 11.000,1.0551,0.02554,0.01772,0.0260,0.1926,1.0000 11.250,1.0565,0.02609,0.01833,0.0297,0.1876,1.0000 11.500,1.0607,0.02673,0.01893,0.0328,0.1830,1.0000 11.750,1.0680,0.02750,0.01967,0.0354,0.1782,1.0000 12.000,1.0731,0.02829,0.02053,0.0379,0.1734,1.0000 12.250,1.0810,0.02913,0.02133,0.0400,0.1690,1.0000 12.500,1.0904,0.03010,0.02228,0.0417,0.1645,1.0000 12.750,1.0969,0.03112,0.02339,0.0435,0.1600,1.0000 13.000,1.1057,0.03215,0.02438,0.0449,0.1559,1.0000 13.250,1.1157,0.03329,0.02550,0.0462,0.1519,1.0000 13.500,1.1216,0.03457,0.02688,0.0475,0.1479,1.0000 13.750,1.1297,0.03580,0.02810,0.0486,0.1442,1.0000 14.000,1.1411,0.03700,0.02924,0.0495,0.1407,1.0000 14.250,1.1448,0.03862,0.03100,0.0505,0.1372,1.0000 14.500,1.1515,0.04009,0.03250,0.0512,0.1339,1.0000 14.750,1.1647,0.04122,0.03351,0.0519,0.1306,1.0000 15.000,1.1663,0.04320,0.03565,0.0525,0.1277,1.0000 15.250,1.1697,0.04508,0.03762,0.0530,0.1247,1.0000 15.500,1.1770,0.04669,0.03921,0.0534,0.1219,1.0000 15.750,1.1888,0.04802,0.04047,0.0539,0.1192,1.0000 16.000,1.1862,0.05062,0.04326,0.0540,0.1167,1.0000 16.250,1.1888,0.05282,0.04554,0.0541,0.1141,1.0000 16.500,1.1965,0.05454,0.04724,0.0542,0.1118,1.0000 16.750,1.2085,0.05592,0.04855,0.0545,0.1094,1.0000 17.000,1.2012,0.05929,0.05213,0.0540,0.1073,1.0000 17.250,1.1998,0.06212,0.05507,0.0536,0.1051,1.0000 17.500,1.2054,0.06420,0.05716,0.0533,0.1030,1.0000 17.750,1.2264,0.06458,0.05736,0.0540,0.1007,1.0000 18.000,1.2113,0.06911,0.06215,0.0527,0.0992,1.0000 18.250,1.2021,0.07314,0.06636,0.0514,0.0974,1.0000 18.500,1.1994,0.07641,0.06972,0.0505,0.0957,1.0000 18.750,1.2073,0.07835,0.07164,0.0501,0.0940,1.0000 19.000,1.2296,0.07842,0.07155,0.0509,0.0921,1.0000 19.250,1.2067,0.08443,0.07786,0.0485,0.0910,1.0000