Originally Posted by Stresscracked
Good Morning all !
Balancing the props can be done most easily by moving the large driven gear down off the shaft until it no longer is engaged with the small motor pinion gear, and can spin freely.
Holding the craft sideways, the prop assembly rotates quite freely (or it should if the bearings are clean and undamaged), and the prop will let you know the heavy side. As always, perform this test in very still air, as even the slightest air currents will move the prop.
After applying tape to the "light" side, rotating the craft slightly around the shaft axis with the prop horizontal, will show whether or not the prop is now in balance, it should remain in that orientation, or will drop a blade to the heavy side if not.
This method is also good to use to disclose the condition of the bearings, and it balances the entire prop/shaft/gear assembly, not just the prop.
I know this is an oldish post to reply to, but I just found it and I think it's worth re-highlighting
Balancing the props using this method on my MQx made a huge
different to removing vibration in my video with an 808 camera slung under it.
After applying some tape to the 'light' blade, there was a little bit of friction in the shaft that made that last bit of difference hard to spot, but I found that by tapping on the arm below the prop, it broke the friction and encouraged the now still only slightly
heavier prop to come around to the bottom. I then added a tiny sliver more tape to the light prop.
Then, when tapping it didn't make it turn no matter what position I started the props, it was all done. And as mentioned above, this balances everything, so is better than just doing the props.
Video is now vibration free. It also sounds much quieter when flying.