How may I create a continuously looping animation? I would like to create a continuously looping animation that repeats itself constantly and without my help (I do not want to create one animation and then copy and paste it over and over again).  A good example would be the rotational movement of a helicopter's blades.  I am not repulsed by a scripting solution, and would indeed welcome it.  How may I accomplish this?
To do this, you'll want to add a Cyclic F-modifier. Go into the Graph Editor and select the keyframes that you wish to loop over (over their respective time period), press Shift + E, and select "Make Cyclic (F-modifier)".