Overview
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 | 200 |
N | 140 |
B | 67 |
A | 33 |
D | 10 |
E | 13 |
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
View: Perspective
View: Looking from blade tip to root
2. Carving the windward face
View: Perspective
View: Looking from blade tip to root
View: Perspective
3. Carving the downwind side and blade thickness
View: Perspective
View: Looking from blade tip to root
View: Perspective upwind side
View: Perspective downwind side
4. Carving the airfoil shape
View: Perspective upwind side
View: Looking from blade tip to root
View: Looking from blade tip to root
View: Looking from blade tip to root
View: Looking from blade tip to root
View: Perspective upwind side
5. Cut the edges of the root
View: Perspective upwind side
View: Perspective blade root
View: Perspective blade root
View: Perspective upwind side