ImanOverview
In this section we focus on carving the Rotor Blade by hand from a piece of wood. Use the CAD file to gain a better understanding of the diamensions as long as we didn't put numbers on the renderings.
This method is heavily inspired by Performance analysis and improvement of a small locally produced wind turbine for developing countries, section "Blade manufacturing manual for the new rotor design", p.111, by Nienke Hosman.
Following variables are used:
| Variables | mm |
|---|---|
| blade length R | 900 |
| wood length L | 1000 |
| blade width W | 80 |
| minimum wood thickness H | 25 |
| chord C | 80 |
| M | 150 |
| N | 75 |
| B | 67 |
| A | 33 |
| D | 10 |
| airfoil thickness T | 10 |
| a1 | 10 |
| a2 | 3 |
| a3 | 24 |
| blade angle θ | 7° |
Materials
See pos. 1 in the BOM, not all materials listed there may be required at this point.
Build
1. Define up- and downwind side of the blade
2. Carving the windward face
3. Carving the downwind side and blade thickness
4. Carving the airfoil shape
5. Cut the edges of the root
6.
