Attached Link: http://www.vanishingpoint.biz/graphics/products/JHoagland_26_3.jpg

Sittingblue is right-

See this helicopter tail prop link- it's a trans-map!

Most Paint software has a "Radial Blur" filter. These are
ideal for making spinning props. Just paint out the prop
in still motion and then apply your Radial Blur to the amount of spin you want. Apply Yellow TIPS if you want those on the ends of the spinning blades...