I am trying to animate a drone with 6 spinning propellers in version 2.79b. I can make the props spin in object mode by selecting them and choosing individual origins for pivot center, however when I try to animate the spinning props only 1 prop spins. How do I animate all 6 props spinning at the same time? I have tried grouping, parenting and joining and still only 1 prop spins.

I am trying to animate a drone with 6 spinning propellers in version 2.79b. I can make the props spin in object mode by selecting them and choosing individual origins for pivot center, however when I try to animate the spinning props only 1 prop spins. How do I animate all 6 props spinning at the same time? I have tried grouping, parenting and joining and still only 1 prop spins.