slangen, are your familiar with moving pivot points?
if not, this is one thing you need to you know.
Whilst having an object selected you can move is pivot point by pressing the "Insert" key.
After you've moved the pivot point to the desired position you simple duplicate and rotate it,
go into the duplicate option box and goto the rotate option and put in the amount you want to rotate it by and then put the number of copies you want and click apply if all goes well then you should have your propeller, theres also another which is:
Using "SHIFT+D" this way you acutally incorporate both of the techniques above, by using "SHIFT+D" you can acutally duplicate to the distance you set by moving the first copy after that each consecutive time you press "SHIFT+D" you duplicate the exact same distance.
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