Select the side from the layout menu tool bar. Then click on curves from the palette tool and draw the sketch using line and curve. Revolve the sketch about global axis using surface tool ...

Creating a blade Select the top view and draw the sketch using curve shown in fig., then select the back view, pull the curve in z-direction using pick CV and move from the transformation menu as shown below

Select the skin surface using surfaces icon then select the curve
Rotate the blade
Then rotate the blade using rotate from transformation menu then enter the angle 5 degree about xdirection (display in the top of the menu)
Go to top view, draw the curve and project the curve on the surface using surface edit tool ...
Source: augiindia.augi.com