the skills from the .instructable can be used for making many different things on Solid Works.
Step 1: Step 1 - outline
Use the image attached or another image or the desired blade.
Resize the image to the size of blade yo want
To make it easier to draw round the shape of the blade it is a good idea to split it into 6 sections using the linear sketch pattern.
Where the vertical lines cross the outline of the blade insert sketch points.
You can then delete the lines leaving only the sketch points
Using the spline tool you can draw round the outline of the shape
Use the arrows to adjust the lines to fit the outline of the picture
once you have done this you can delete the picture leaving only the outline