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Re: windmill blades.

Roger Whiteley

Mon, Jun 26, 2023 9:09 AM

Try these..
https://hackaday.com/2020/08/14/quick-3d-printed-airfoils-with-these-openscad-helpers/

I especially like http://chaaawa.com/airfoils/index.cgi?o=name&n=50&p=2

Which produced this..

// Points from cr1.dat in the archive:
http://m-selig.ae.illinois.edu/ads/archives/coord_seligFmt.tar.gz
// Not necessarily in the same order as in:
http://m-selig.ae.illinois.edu/ads/coord/cr1.dat

cr1_points =
[[1000,0.0173],[990,2.6651],[980,5.2997],[970,7.9079],[960,10.4761],[940,15.4453],[920,20.2277],[900,24.9688],[880,29.7881],[860,34.6645],[840,39.5362],[819.9999,44.3404],[800,49.0156],[780,53.5129],[760,57.8435],[740,62.0373],[720,66.1238],[700,70.1324],[680,74.083],[660,77.9406],[640,81.6511],[620,85.1617],[600,88.4199],[580,91.3811],[560,94.0411],[540,96.4112],[520,98.5024],[500,100.3252],[480,101.8894],[460,103.2027],[440,104.2715],[420,105.1022],[400,105.701],[380,106.0724],[360,106.2082],[340,106.0956],[320,105.7211],[300,105.0716],[280,104.1314],[260,102.8691],[240,101.2466],[220,99.2238],[200,96.7598],[180,93.8086],[160,90.3037],[140,86.1657],[120,81.1676],[100,74.8305],[80,66.7124],[60,57.1529],[50,51.5424],[40,44.9223],[30,37.219],[20,28.4739],[12,20.4608],[8,15.913],[4,10.4752],[2,6.9026],[1,4.5082],[0.5,2.8877],[0,0],[0.5,-4.9013],[1,-6.3669],[2,-8.4885],[4,-11.5467],[8,-15.8525],[12,-19.0076],[20,-23.277],[30,-26.5473],[40,-28.8161],[50,-30.386],[60,-31.4227],[80,-32.2357],[100,-31.904],[120,-31.0798],[140,-29.893],[160,-28.3204],[180,-26.4458],[200,-24.4737],[220,-22.5857],[240,-20.826],[260,-19.2004],[280,-17.7151],[300,-16.3755],[320,-15.1843],[340,-14.1278],[360,-13.1887],[380,-12.3493],[400,-11.5922],[420,-10.903],[440,-10.2799],[460,-9.7239],[480,-9.2366],[500,-8.8192],[520,-8.4708],[540,-8.1817],[560,-7.9399],[580,-7.7333],[600,-7.5498],[620,-7.3791],[640,-7.2182],[660,-7.0659],[680,-6.921],[700,-6.7822],[720,-6.6495],[740,-6.527],[760,-6.4199],[780,-6.3335],[800,-6.273],[819.9999,-6.2355],[840,-6.1851],[860,-6.0768],[880,-5.866],[900,-5.5081],[920,-4.9546],[940,-4.1417],[960,-3.0058],[970,-2.3222],[980,-1.5842],[990,-0.8099]];

linear_extrude(height=20)
scale([15, 15])
translate([0,0])
scale (0.001)
polygon(points=cr1_points);

Try these.. https://hackaday.com/2020/08/14/quick-3d-printed-airfoils-with-these-openscad-helpers/ I especially like http://chaaawa.com/airfoils/index.cgi?o=name&n=50&p=2 Which produced this.. // Points from cr1.dat in the archive: http://m-selig.ae.illinois.edu/ads/archives/coord_seligFmt.tar.gz // Not necessarily in the same order as in: http://m-selig.ae.illinois.edu/ads/coord/cr1.dat cr1_points = [[1000,0.0173],[990,2.6651],[980,5.2997],[970,7.9079],[960,10.4761],[940,15.4453],[920,20.2277],[900,24.9688],[880,29.7881],[860,34.6645],[840,39.5362],[819.9999,44.3404],[800,49.0156],[780,53.5129],[760,57.8435],[740,62.0373],[720,66.1238],[700,70.1324],[680,74.083],[660,77.9406],[640,81.6511],[620,85.1617],[600,88.4199],[580,91.3811],[560,94.0411],[540,96.4112],[520,98.5024],[500,100.3252],[480,101.8894],[460,103.2027],[440,104.2715],[420,105.1022],[400,105.701],[380,106.0724],[360,106.2082],[340,106.0956],[320,105.7211],[300,105.0716],[280,104.1314],[260,102.8691],[240,101.2466],[220,99.2238],[200,96.7598],[180,93.8086],[160,90.3037],[140,86.1657],[120,81.1676],[100,74.8305],[80,66.7124],[60,57.1529],[50,51.5424],[40,44.9223],[30,37.219],[20,28.4739],[12,20.4608],[8,15.913],[4,10.4752],[2,6.9026],[1,4.5082],[0.5,2.8877],[0,0],[0.5,-4.9013],[1,-6.3669],[2,-8.4885],[4,-11.5467],[8,-15.8525],[12,-19.0076],[20,-23.277],[30,-26.5473],[40,-28.8161],[50,-30.386],[60,-31.4227],[80,-32.2357],[100,-31.904],[120,-31.0798],[140,-29.893],[160,-28.3204],[180,-26.4458],[200,-24.4737],[220,-22.5857],[240,-20.826],[260,-19.2004],[280,-17.7151],[300,-16.3755],[320,-15.1843],[340,-14.1278],[360,-13.1887],[380,-12.3493],[400,-11.5922],[420,-10.903],[440,-10.2799],[460,-9.7239],[480,-9.2366],[500,-8.8192],[520,-8.4708],[540,-8.1817],[560,-7.9399],[580,-7.7333],[600,-7.5498],[620,-7.3791],[640,-7.2182],[660,-7.0659],[680,-6.921],[700,-6.7822],[720,-6.6495],[740,-6.527],[760,-6.4199],[780,-6.3335],[800,-6.273],[819.9999,-6.2355],[840,-6.1851],[860,-6.0768],[880,-5.866],[900,-5.5081],[920,-4.9546],[940,-4.1417],[960,-3.0058],[970,-2.3222],[980,-1.5842],[990,-0.8099]]; linear_extrude(height=20) scale([15, 15]) translate([0,0]) scale (0.001) polygon(points=cr1_points);