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Old May 09, 2015, 03:23 PM
Daniel F EDF is offline
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Slovakia, Banská Bystrica Region, Banská Bystrica
Joined Feb 2015
72 Posts
Originally Posted by antslake View Post
It is a bit confusing and the instructions can be better. The balancer has no way of knowing the position of the fan. So the way you use it goes like this:
1. First, try to get the fan running as smoothly as possible by rotating the blades on the shaft 90° at a time. Pick the one that is the smoothest and fine adjust until it is running as smooth as possible. Just do this by feel, no need for the balancer yet. Then add the nose cone, and do the same thing.
2. Now mount up your balancer using a cushion between the bracket and fan housing. Take the bracket off the balancer while doing this. Start with the knob fully counter clockwise. Make a mark on the nose cone that shows up in the strobe. Add a small amount of weight starting at the mark (12 o'clock) at 12,3,6,9 o'clock position and run it with the strobe on each time. You will see the line in the strobe. Remember that location. where that line is, and where the weight is, IS your heavy spot. The actual spot is where the weight is, you reference is where the line is. You add weight to the opposite side of the "heavy side". start with a pinch and play around with the weights until the strobe goes out. Start turning the knob clockwise and add or subtracting weight.

i.e. lets say I get the fan balanced as much as possible by rotating the blade and cone, then it is on the balancer. I run the extra weight and notice that the line is in the 12 o'clock position, but the extra weight I added is in the 9 o'clock position. That tells me, when the line appears at 12, the heavy side is at 9, so I need to add weight to 3 o'clock. So now I take off the extra weight, run it, and the line shows up at 3 o'clock. The heavy side is still at 9 o'clock, and I still need to add weight to the 3 o'clock position. So in this case I would add weight right where the line is.

P.S. I will balance your fan for $10 plus shipping, which is usually around $6.

Thanks for making it clear to me! I would really lime to semd you my fans... I am from central Europe so I dont think that shipping will be 6usd (unfortunately). I think that shipping will be more than a price of my combos... If I move any closer, I will call you! :-))))
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Old Aug 27, 2015, 07:58 PM
Yomo is offline
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United States, CA, Moorpark
Joined Jan 2008
76 Posts
Hi Don - So in step 7, did you remove the weight that was added previously at the yellow mark to the new 6 o'clock position or did you just add more weight, leaving the original that you added under the yellow mark?


Originally Posted by The Don View Post
I have had several people ask me how to use this device etc and here is how I balance a rotor. It is essentially what is spelled out in the manual but I will write exactly what I do.

1. Mark the blade with a yellow stripe from a paint marker near the center of the hub

2. Run the fan on a 2S lipo to about 1/4 throttle

3. Rotate the sensitivity all the way up (cw) then turn back ccw as low as it will go to get a steady single line. Note that position, say it is the 1 on a clock face, i.e. 1 o'clock position.

4. Add a piece of ballast to the rotor in line with the mark on the spinner

5. Spin it back up again but this time do not mess with the sensitivity knob, just observe where the new line is. Lets say it is at the 12 o'clock position.

6. Shut the motor off, then rotate the yellow mark on the spinner to the
position where the line was observed with no added ballast (step 3). In this case the 1 o'clock position.

7. From step 5 we know the observed ballasted line was in the 12 o'clock position so we want to add weight to the rotor 180 degree away from that which is the 6 o'clock position. So the yellow mark on the rotor is pointed to the 1 o'clock position, but we are going to add weight to the rotor at the 6 o'clock position.

8. Once you add the weight spin up the fan again. If you are close to being balanced you will see no flashing on the rotor from the strobe at all when you start it back up. This means the vibration is small and that the sensitivity knob has to be turned cw to increase the sensitivity level to see the lines again. Yo may have to add or subtract small amounts of weight to get the lines to go all around the spinner evenly. Sometimes it is very hard to do and I can get only 1/2 or 3/4 the way around but on the smaller fans I do, even that feels very smooth when you run up the fan.

One other thing I do is when I am very close I will move the weight clockwise or counter clockwise maybe 1/8" to fine tune it. I have found that sometimes I can be off in the exact location on the ballast location and 1/8" in either direction can suddenly make a big difference.

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Old Dec 30, 2015, 08:03 AM
flashandcrash is offline
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Joined Jan 2014
7 Posts
Thank you guys for the tips. I just tried out Bobs balancer and it is fantastic!

For the first balance I used an eflite BL32 motor and Delta V32 80mm fan. I ran fan as slow as it would run evenly with a 20A speed controller set to slow start and auto timing, 3s lipo, and spare receiver. I would have liked to send the motor back because running it was rough at low speed but I have had this setup for a long time and haven't used it since it vibrated so much. I put a mark on the motor, fan shaft, and fan hub/spinner with a sharpie. The motor went to about 50% gain on balancer before I had a clear signal from the balancer.
It took me longer than it should have because I wasn’t using enough weight-large pea sized amounts of blu tack(as apparently blu tack doesn’t weigh much) and I couldn’t find the true heavy spot because I needed like 3 pea sized amounts to balance it.

For what worked- after testing the motor, I found the best balance for the fan shaft on the motor using both the balancer and feeling the housing. I had to rotate the fan shaft on the motor. Then I rotated the fan on the shaft several times counter clockwise and found the most balanced position for the fan on the shaft. I realized the fan at some point was hitting the housing so I rotated the fan shroud. Then I figured out where the heavy point was. I place blu tack at the light side. Then I verified the heavy point again and it had moved . Then I did the balance. After I was sure where the weight needed to go I used thick CA and quick cure. I was able to take almost all of the vibration out. I think the remaining vibration is motor related. As a unit it runs smoother than just the motor does at low speed. At high speed there is very little vibration.
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Last edited by flashandcrash; Dec 30, 2015 at 08:52 AM.
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