: Build Log
Wicked Powered Great Planes Evader EDF
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Jul 14, 2010
, 11:45 PM
Joined Jan 2002
Installing the motor into the fan unit was not difficult. I took a few photos showing it. The real issue came with the spinner. With no spinner the fan runs quite well and pretty smooth. So I added the spinner and tried to balance it. After 45 minutes I realized there was no way it will balance too much out of round so I hooked up a 2S lipo and ran the motor fan unit at partial throttle and used a grinding stone and pressed it against the spinner while turning to try to smooth it out./ You can see by the photos how out of round the spinner is. I kept on going until it I would get full marks around the whole OD. So then I used some 320 grit paper and smoothed it some then 600 grit to get it even smoother. i then ran it up and was much smoother on a 2S lio. So I went to the 4S lipo again and at half throttle the fan vibrated bad. So I worked some more to balance, and I got it to run silky smooth up to 50% throttle then suddenly it would always go way out of balance. I finally gave up after about 45 more minutes of messing around. So I balanced it with no spinner on. I then test fit the parts for the outlet and inlet and it fit just fine.
As far as the spinner, I think the trouble is the screw is way down low and the rest of the spinner is unsupported and can flex at higher rpm. So for the heck of it I mixed up some epoxy and filled the spinner with it. I am letting it cure over night and I will see if it can be balanced now as the spinner will be acting as one unit. Worth a test anyhow.
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The mounting slots are opened up to 1/8" wide.
Brass adapter press on with some loctite as well.
See how out of round the spinner is. Grinding stone touches on one side but not the other.
Almost back to round.
Now back to round.
Smoothed with some sand paper.
Motor and mounting ring
Here is the spinner. See how the mount point is at the bottom. I think the tip flexes s it is too weak.
Filled with finishing resin.
Last edited by The Don; Jul 14, 2010 at