18x8 (18x8.dat) v2025-1001 Simulation Date: 02/24/2026 ----- AIRFOIL SUMMARY DATA ----- DEFINITIONS: THE QUOTED PITCH REFLECTS, IN GENERAL, ANGULAR MEASURE AS DEFINED WITH A FLAT BOTTOM SURFACE. THIS WILL AGREE WITH A PRATHER GAGE MEASUREMENT OVER MOST OF THE EFFECTIVE PORTION OF THE BLADE. (NOTE: QUOTED=INPUT) THE LE-TE MEASURE IS DEFINED IN TERMS OF LEADING EDGE AND TRAILING EDGE (MOLD) PARTING LINE DATUMS. THE PRATHER MEASURE REFLECTS THE MOST LIKELY PITCH INTERPRETATION FROM A PITCH MEASUREMENT DEVICE THAT RESTS AGAINST THE LOWER SURFACE. SWEEP & RAKE ARE DEFINED WITH (MOLD) LE PARTING LINE. ZHIGH IS HIGHEST ELEVATION ON TOP SURFACE. TWIST IS DEFINED WITH (MOLD) LE AND TE PARTING LINE DATUMS. CHORD IS THE LENGTH BETWEEN (MOLD) LE AND TE PARTING LINES. CGY IS MASS OFFSET, FORE-AFT. CGZ IS MASS OFFSET, ELEVATION. STATION CHORD PITCH PITCH PITCH SWEEP(Y) RAKE(Z) THICKNESS TWIST MAX-THICK CROSS-SECTION ZHIGH CGY CGZ (IN) (IN) (QUOTED) (LE-TE) (PRATHER) (IN) (IN) RATIO (DEG) (IN) (IN**2) (IN) (IN) (IN) 0.0000 1.7500 -2.4291 0.0000 0.0000 0.8750 0.0000 0.2571 0.0000 0.4500 0.0000 0.2000 0.0000 0.0000 0.2558 1.6795 -0.9865 0.0196 -0.4565 0.8624 0.0139 0.2567 0.6987 0.4312 0.6510 0.2125 0.0214 -0.0162 0.5116 1.6217 0.3194 0.1490 -0.8205 0.8505 0.0508 0.2555 2.6532 0.4144 0.6402 0.2449 0.0419 0.0023 0.7674 1.5779 1.4953 0.4738 -0.9408 0.8394 0.1042 0.2535 5.6123 0.4000 0.6221 0.2914 0.0606 0.0306 1.0232 1.5495 2.5479 1.0470 -0.7131 0.8291 0.1676 0.2506 9.2501 0.3884 0.5984 0.3466 0.0776 0.0655 1.2790 1.5359 3.4839 1.8817 -0.0917 0.8200 0.2348 0.2470 13.1789 0.3793 0.5706 0.4052 0.0932 0.1041 1.5348 1.5342 4.3099 2.9474 0.9028 0.8121 0.2994 0.2425 16.9950 0.3721 0.5398 0.4613 0.1077 0.1430 1.7906 1.5393 5.0326 4.1680 2.1803 0.8055 0.3551 0.2372 20.3280 0.3652 0.5069 0.5089 0.1216 0.1782 2.0464 1.5439 5.6588 5.4222 3.5805 0.8005 0.3955 0.2311 22.8652 0.3568 0.4728 0.5417 0.1350 0.2054 2.3022 1.5401 6.1951 6.5430 4.8723 0.7972 0.4143 0.2243 24.3387 0.3455 0.4383 0.5534 0.1478 0.2198 2.5580 1.5208 6.6482 7.3166 5.7522 0.7958 0.4051 0.2177 24.4765 0.3311 0.4042 0.5378 0.1595 0.2161 2.8108 1.4895 7.0208 7.7381 6.2056 0.7953 0.3770 0.2115 23.6608 0.3150 0.3715 0.5039 0.1701 0.1998 3.0116 1.4636 7.2678 8.0196 6.5299 0.7946 0.3546 0.2068 22.9678 0.3027 0.3468 0.4773 0.1785 0.1874 3.2094 1.4371 7.4721 8.2562 6.8203 0.7936 0.3328 0.2024 22.2655 0.2908 0.3235 0.4516 0.1869 0.1754 3.4072 1.4098 7.6409 8.4558 7.0812 0.7923 0.3113 0.1982 21.5531 0.2794 0.3014 0.4264 0.1955 0.1637 3.6050 1.3816 7.7772 8.6216 7.3120 0.7906 0.2900 0.1941 20.8384 0.2682 0.2805 0.4017 0.2041 0.1521 3.8028 1.3526 7.8840 8.7569 7.5123 0.7884 0.2690 0.1903 20.1277 0.2575 0.2609 0.3774 0.2127 0.1405 4.0006 1.3228 7.9646 8.8650 7.6818 0.7858 0.2484 0.1867 19.4265 0.2470 0.2425 0.3536 0.2214 0.1290 4.1984 1.2921 8.0220 8.9491 7.8204 0.7827 0.2281 0.1833 18.7394 0.2369 0.2253 0.3302 0.2302 0.1174 4.3962 1.2606 8.0593 9.0125 7.9285 0.7790 0.2082 0.1802 18.0705 0.2271 0.2093 0.3073 0.2388 0.1057 4.5940 1.2284 8.0796 9.0585 8.0065 0.7747 0.1887 0.1772 17.4231 0.2176 0.1943 0.2849 0.2474 0.0940 4.7918 1.1954 8.0859 9.0902 8.0552 0.7698 0.1696 0.1744 16.8003 0.2085 0.1804 0.2630 0.2558 0.0822 4.9896 1.1616 8.0814 9.1110 8.0756 0.7642 0.1508 0.1718 16.2048 0.1996 0.1675 0.2415 0.2641 0.0703 5.1874 1.1270 8.0692 9.1241 8.0692 0.7579 0.1326 0.1695 15.6388 0.1910 0.1554 0.2205 0.2720 0.0583 5.3852 1.0917 8.0523 9.1317 8.0523 0.7508 0.1149 0.1672 15.1032 0.1825 0.1438 0.1999 0.2797 0.0465 5.5830 1.0557 8.0338 9.1368 8.0337 0.7430 0.0978 0.1648 14.5991 0.1740 0.1327 0.1799 0.2869 0.0348 5.7808 1.0190 8.0169 9.1423 8.0167 0.7343 0.0813 0.1625 14.1280 0.1656 0.1219 0.1603 0.2938 0.0233 5.9786 0.9815 8.0046 9.1513 8.0044 0.7248 0.0654 0.1602 13.6915 0.1573 0.1115 0.1411 0.3001 0.0120 6.1764 0.9434 8.0000 9.1670 7.9998 0.7143 0.0501 0.1579 13.2906 0.1490 0.1015 0.1224 0.3059 0.0009 6.3742 0.9045 8.0000 9.1860 7.9997 0.7029 0.0353 0.1556 12.9180 0.1408 0.0920 0.1042 0.3110 -0.0100 6.5720 0.8650 8.0000 9.2039 7.9997 0.6905 0.0211 0.1533 12.5653 0.1326 0.0829 0.0864 0.3156 -0.0206 6.7698 0.8248 8.0000 9.2205 7.9997 0.6771 0.0074 0.1510 12.2307 0.1245 0.0742 0.0692 0.3194 -0.0309 6.9676 0.7840 8.0000 9.2358 7.9997 0.6625 -0.0058 0.1487 11.9128 0.1166 0.0660 0.0523 0.3224 -0.0409 7.1654 0.7425 8.0000 9.2499 7.9997 0.6469 -0.0185 0.1464 11.6101 0.1087 0.0583 0.0360 0.3247 -0.0507 7.3632 0.7004 8.0000 9.2626 7.9997 0.6302 -0.0308 0.1441 11.3215 0.1009 0.0511 0.0201 0.3260 -0.0601 7.5610 0.6576 8.0000 9.2738 7.9998 0.6122 -0.0425 0.1418 11.0457 0.0932 0.0443 0.0047 0.3265 -0.0692 7.7588 0.6143 8.0000 9.2835 7.9998 0.5930 -0.0538 0.1395 10.7818 0.0857 0.0381 -0.0103 0.3260 -0.0780 7.9566 0.5703 8.0000 9.2917 7.9998 0.5726 -0.0647 0.1371 10.5288 0.0782 0.0323 -0.0248 0.3246 -0.0864 8.1544 0.5258 8.0000 9.2980 7.9999 0.5508 -0.0751 0.1348 10.2858 0.0709 0.0270 -0.0388 0.3221 -0.0946 8.3522 0.4807 8.0000 9.3023 7.9999 0.5277 -0.0851 0.1325 10.0518 0.0637 0.0222 -0.0524 0.3185 -0.1024 8.5421 0.4368 8.0000 9.3279 7.9939 0.5042 -0.0940 0.1303 9.8593 0.0569 0.0180 -0.0649 0.3139 -0.1096 8.5955 0.4246 8.0000 9.4314 7.9721 0.4973 -0.0958 0.1297 9.9059 0.0551 0.0169 -0.0681 0.3125 -0.1115 8.6409 0.4141 8.0000 9.5885 7.9460 0.4914 -0.0967 0.1292 10.0156 0.0535 0.0160 -0.0707 0.3112 -0.1131 8.6864 0.4038 8.0000 9.8134 7.9175 0.4854 -0.0972 0.1286 10.1932 0.0519 0.0152 -0.0730 0.3098 -0.1146 8.7318 0.3935 8.0000 10.1106 7.8908 0.4794 -0.0973 0.1281 10.4417 0.0504 0.0143 -0.0751 0.3083 -0.1160 8.7773 0.3804 8.0000 10.4853 7.8711 0.4705 -0.0975 0.1276 10.7649 0.0485 0.0133 -0.0776 0.3053 -0.1177 8.8227 0.3586 8.0000 10.9569 7.8664 0.4529 -0.0989 0.1270 11.1806 0.0456 0.0117 -0.0818 0.2974 -0.1204 8.8682 0.3254 8.0000 11.5050 7.8877 0.4240 -0.1026 0.1265 11.6663 0.0412 0.0096 -0.0886 0.2831 -0.1246 8.9136 0.2747 8.0000 12.1438 7.9490 0.3780 -0.1101 0.1260 12.2341 0.0346 0.0068 -0.0997 0.2592 -0.1311 8.9591 0.1771 8.0000 12.8784 8.1239 0.2863 -0.1287 0.1254 12.8863 0.0222 0.0028 -0.1229 0.2098 -0.1441 9.0000 0.0164 8.0000 8.0001 8.0000 0.1337 -0.1657 0.1250 8.0523 0.0020 0.0000 -0.1657 0.0000 0.0000 RADIUS: 9.00 PROPELLER RADIUS (IN) HUBRAD: 0.88 HUB RADIUS (IN) HUBTRA: 2.56 HUB TRANSITION (IN) BLADES: 2 NUMBER OF BLADES ----- INERTIA AND AREA DATA ----- TOTAL WEIGHT (LB) = 0.290751 TOTAL WEIGHT (Kg) = 0.131860 TOTAL VOLUME (IN**3) = 4.736703 TOTAL PROJECTED AREA (IN**2) = 19.8430 MOMENT OF INERTIA (SNAIL-IN**2) = 0.007396 MOMENT OF INERTIA (Kg-M**2) = 0.000835 STATIC MOMENT, ONE SIDE (IN-LB) = 0.360605 SANITY CHECK DATA ARE BELOW DENSITY (SPECIFIC GRAVITY, INPUT FILE) = 1.700 DENSITY (INPUT FILE, LB/IN**3) = 0.6138E-01 AVERAGE DENSITY (FROM WT & VOL ABOVE, LB/IN**3) = 0.6138E-01 ACTIVITY FACTOR = 62.214 INNER LIMIT (NORMALIZED BY RADIUS) = 0.097 ----- NATURAL FREQUENCY DATA ----- LOWEST NATURAL BENDING FREQUENCY (IN TERMS OF RPM) = 13685.85 BASED ON MODULUS (MILLION) = 2.80 AND, MATERIAL DENSITY (S.G.) = 1.70 ----- AIRFOIL SECTIONS ----- AIRFOIL1: 2.56, CLARK-Y (Transition Start, Airfoil 1) AIRFOIL2: 3.00, CLARK-Y (Transition End, Airfoil 2) AIRFOILS ARE SCALED BASED ON THICKNESS RATIO IN TABLE ABOVE.