5*3" 2 bladed propeller (OpenSCAD) CW+CCW

thingiverse

A basic 2-bladed propeller with very nice blades taken from http://www.thingiverse.com/thing:172801 has been created. I've attempted to replicate the dimensions of a common 5x3 inch propeller obtained from this collection:http://www.aliexpress.com/item/Mini-250-Quadcopter-1806-2280kv-Motor-12A-Esc-CC3D-Flight-Control-5030-Propeller-CC3D-Distribution-LED/32297309822.html To get a (virtually) valid STL, just like the one found under the "Thing Files" tab, you have to open the STL file exported from OpenSCAD in MeshLab and apply the filter "Cleaning and Repairing" -> "Remove Duplicate Faces." This still leaves a few errors, but it is close enough to be sliced with Slic3r. see also:http://forum.openscad.org/Visually-and-by-inspecting-code-surface-looks-perfect-But-quot-Object-may-not-be-a-valid-2-manifold--td12686.html The initial set of files I've uploaded is a CCW prop, now I have added a CW prop with a more reasonable filename. They are lying upside down since on the underside, the center ring hole is 1.5x1.5mm larger than the rest of the hole (which is 5mm) which, of course, is better printable when this larger hole faces upwards. The wings can only be printed with support material either way. UPDATE: Since this prop has much too little lift, I have created a new version with bigger wings, see files. To circumvent issues with the resulting STL files, I've instead based this new design on a cleaned up STL containing a single wing -> "mywing_ml3.stl" UPDATE 2015-05-31 Today, I tested a few prints of the "big-wing" variant and unlike expected, I got much less lift from it than the original design. Next, I am going to try something even simpler: "redesigned-wing_2D_v3.stl" UPDATE 2015-06-01 Since by now I've printed and tested a lot of props (I'm trying to get usable propellers so that I can fly my quadcopter until the time arrives when my prop shipment comes), I have put together a list with how much lift every print gave me (measured by strapping the quadcopter to kitchen scales, and just turning on one motor using the cleanflight configurator's motor test tool). original prop supplied with my quadcopter set -> between 280g and 300g "5x3prop_CCW" (first design) -> 135g "big-wings_v2" -> 60g "redesigned-wing_2D_v3" -> 170g "prop5x3x2_v7" -> 207g "prop5x3x2_v8" -> 158g "prop5x3x2_v8" after bending the rear ends of the wings down (with a soldering iron heated to 190°C and a flat end) -> 184g "prop5x3x2_v9" -> around 230g I've stopped working on this project since my delivery of replacement props has finally arrived;) If you're interested in the story behind these propellers, see http://koega.no-ip.org/mediawiki/index.php/Building_a_quadcopter