Projects to Get You Off the Grid by Instructables.com

Author:Instructables.com
Language: eng
Format: epub
Publisher: Skyhorse
Published: 2012-12-31T16:00:00+00:00

4. Start where Line A intersects Line B. Going left around Line B, make a mark at every 145 mm. The last section should be about 115 mm.

5. Start where Line A intersects Line C. Going right around Line C, make a mark at every 145 mm. The last section should be about 115 mm.

6. Mark each line using a straight edge.

7. Cut along these lines, using the jigsaw, so that you have four strips of 145 mm and one strip about 115 mm.

8. Take each strip and place them with the inside of the pipe facing down.

9. Make a mark at one end of each strip 115 mm from the left edge.

10. Make a mark at the other end of each strip 30 mm from the left edge.

11. Mark and cut these lines, using the jigsaw.

12. Place each blade with the inside of the pipe facing down.

13. Make a mark along the angled line of the blade, 3 inches from the wide end.

14. Make another mark on the wide end of the blade, one inch from the straight edge.

15. Connect these two marks and cut along the line. This prevents the blades from interfering with the others’ wind.

Sanding the Blades

You should sand the blades to achieve the desired airfoil. This will increase the efficiency of the blades, as well as make them quieter. The angled (leading) edge wants to be rounded, while the straight (tailing) edge wants to be pointed. Any sharp corners should be slightly rounded to cut down on noise.

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