How to make RC helicopter blades

If you have the conditions, you can find a manufacturer, tell the propeller (helicopter blade) overall diameter, the diameter of the central shaft (in order to make a set of rotor shaft with the sleeve), and directly molded in plastic. This way the propeller shape is good, high efficiency, but high cost, easy to break.

Manually, in order to facilitate the processing is recommended to use a wooden board, pay attention to must be a one-piece can not be plywood, etc., preferably birch (references). Draw the center line, then draw curves on the top and bottom sides of the board according to the reference. Abrade the shape with a file plus sandpaper. Personally, I don't feel this is a good shape, inefficient and breakable, complicated, but inexpensive (based on experience in grinding fixed wing airplane wings). (The method is detailed in the reference material)

The above two is the whole propeller, the market model helicopter propeller is a hard plastic sheet respectively bent into a 15-degree arc, and will be tilted 15 degrees blade mounted on the spindle, is a combination of, if you can have this processing conditions, the effect is better than the above two.