I believe he is referring to one of the Electric EDF jets...

TxRCFlyer:

I've outlined the proceedure in one of the other EDF jet's here... I believe it was in the F-35.

More detailed info can be had by searching the Electric EDF forums.

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In a nutshell...

- You run the engine at a medium to 70% throttle speed for about 10-20 seconds then turn off the plane.
- You look for any areas on the EDF shroud that were rubbed by the fan.... you'll see some scratching created by the expansion of the blades.
- If you see none, run the engine at 100% power for about 10-15 seconds, and again look for scratching rubbing.
- Where you see this happening, fold over a sheet of sandpaper and insert it between the fan blades and the shroud.
- Manually turn the prop over to remove material from the outer edges of the fan blades.
- There should be about 2mm clearance from the blades to the EDF shroud all around.
- Once done take the fan out, and balance it on a magnetic balancer.
- While it is out, remove one motor retaining screw at a time, put locktite blue on it, and re-install. Repeat for the others.
- Put locktite on the shaft grub screw & re-install
- Balance the fan on a good magnetic balancer. This is very important!
- Re-install and perform the first few items again... check for any vibration.