Update Rotor Blade: correct, change and complete spelling, words and little things, create headlines

5.Let's-build/Rotor-Blade.md

@@ -4,7 +4,7 @@
 
 ![RotorBladeSubstractive_9](/img/RotorBlade/RotorBladeSubstractive_9.png)
 
-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 did'nt put numbers on the renderings.
+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](https://repository.tudelft.nl/islandora/object/uuid%3Ae186338b-87eb-4baa-8280-a7940b83db14),
 section "Blade manufacturing manual for the
@@ -36,25 +36,25 @@ See pos. 1 in the [BOM](/3.Tools-and-materials/1.Bill-of-materials), not all mat
 
 # Build
 
-## 1.
+## 1. ??
 
 ![RotorBladeSubstractive](/img/RotorBlade/RotorBladeSubstractive.png)
 ![RotorBladeSubstractive_10](/img/RotorBlade/RotorBladeSubstractive_10.png)
 
-## 2.
+## 2. Carving the windward face
 
 ![RotorBladeSubstractive_1](/img/RotorBlade/RotorBladeSubstractive_1.png)
 ![RotorBladeSubstractive_11](/img/RotorBlade/RotorBladeSubstractive_11.png)
 ![RotorBladeSubstractive_2](/img/RotorBlade/RotorBladeSubstractive_2.png)
 
-## 3.
+## 3. Carving the downwind side and blade thickness
 
 ![RotorBladeSubstractive_3](/img/RotorBlade/RotorBladeSubstractive_3.png)
 ![RotorBladeSubstractive_12](/img/RotorBlade/RotorBladeSubstractive_12.png)
 ![RotorBladeSubstractive_4](/img/RotorBlade/RotorBladeSubstractive_4.png)
 ![RotorBladeSubstractive_5](/img/RotorBlade/RotorBladeSubstractive_5.png)
 
-## 4.
+## 4. Carving the airfoil shape
 
 ![RotorBladeSubstractive_6](/img/RotorBlade/RotorBladeSubstractive_6.png)
 ![RotorBladeSubstractive_13](/img/RotorBlade/RotorBladeSubstractive_13.png)
@@ -63,7 +63,7 @@ See pos. 1 in the [BOM](/3.Tools-and-materials/1.Bill-of-materials), not all mat
 ![RotorBladeSubstractive_16](/img/RotorBlade/RotorBladeSubstractive_16.png)
 ![RotorBladeSubstractive_7](/img/RotorBlade/RotorBladeSubstractive_7.png)
 
-## 5.
+## 5. Cut the edges of the root
 
 ![RotorBladeSubstractive_8](/img/RotorBlade/RotorBladeSubstractive_8.png)
 ![RotorBladeSubstractive_17](/img/RotorBlade/RotorBladeSubstractive_17.png)