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This description isn't application specific and you should be able to use this "trick" with most 3D applications.

Create blurred color texture

Begin with rendering your propeller straight from the front
Open your render in your 2D editing program. If you don't have access to photoshop I would recommend the GIMP (OpenSource, www.gimp.org)
Scale down to about 500*500 pixels. Try to position the propeller exactly in the middle.
Apply a radial blur (you'll have to experiment with the amount)
Under the propeller layer create a dark gray layer (the gray area should be wider than your blurred propeller - this will prevent white edges around blurred blades).

		Example This is an example (downsized) of how the blurred color texture can look like after the above steps.
Create blurred alpha (transparency) texture Use the same original propeller render (the one from the front) Turn it into grayscale Maximize contrast (your image should now only have 2 colors - black and white) Apply a radial blur (you'll have to experiment with the amount) Your blurred alpha map should have wider blades than the original propeller render (3-4 times wider)
		Example This is an example (downsized) of how the blurred alpha texture can look like after the above steps. The blades in this example are actually not wide enough.
Create your blurred propeller Create a disc in your 3D application Apply the blurred color texture in the color channel Apply the blurred alpha map in the alpha/transparency channel (you may need to invert it in some applications) Play around with transparency and blur amount until you're satisfied with how the render looks Cons and pros compared to using motion blur Pro: easier to control Con: Propeller may look flat when looking from the side