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Rotor Blade

Overview

RotorBladeSubstractive_Description

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

RotorBladeSubstractiveView: Perspective RotorBladeSubstractive_10View: Looking from blade tip to root

2. Carving the windward face

RotorBladeSubstractive_1View: Perspective RotorBladeSubstractive_11View: Looking from blade tip to root RotorBladeSubstractive_2View: Perspective

3. Carving the downwind side and blade thickness

RotorBladeSubstractive_3View: Perspective RotorBladeSubstractive_12View: Looking from blade tip to root RotorBladeSubstractive_4View: Perspective upwind side RotorBladeSubstractive_5View: Perspective downwind side

4. Carving the airfoil shape

RotorBladeSubstractive_6View: Perspective upwind side RotorBladeSubstractive_13View: Looking from blade tip to root RotorBladeSubstractive_14View: Looking from blade tip to root RotorBladeSubstractive_15View: Looking from blade tip to root RotorBladeSubstractive_16View: Looking from blade tip to root RotorBladeSubstractive_7View: Perspective upwind side

5. Cut the edges of the root

RotorBladeSubstractive_8View: Perspective upwind side RotorBladeSubstractive_17View: Perspective blade root RotorBladeSubstractive_18View: Perspective blade root RotorBladeSubstractive_9View: Perspective upwind side

6. Create changeover from airfoil shape to root

RotorBladeSubstractive_19View: Perspective upwind side RotorBladeSubstractive_20View: Perspective upwind side