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Old Jul 18, 2009, 11:14 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
12,799 Posts
Cool
EDF Dynamic rotor balancing

Thought I would post a photo or two of my latest toy. It is a dynamic rotor balancer from Bob Blackburn.

http://www.bobsworkshop.co.uk/outdoo...d-fan-balancer

I ordered it less than two weeks ago, Bob emailed right away and said it would take a week before it would ship (I assume he builds them to order) and one week later I got an email saying it was shipped! Took about 5 days to arrive from the UK, and when the postman handed a box to me today I knew exactly what it was.

I had to try it out right away so I downloaded and printed a copy of the manual from his website then grabbed a fan unit, ESC, and lipo. He says to run low rpm so I used a 2S lipo to make life easy. After about 30 minutes I had my first fan balanced. Most of that time was learning what to do. But this unit is great as it tells you where to place the weight, the only thing you have to do is figure out how much weight, and that is where the trial and error comes in. Balancing was something I always hated to do as you are guessing both the spot and weight amount. Knowing the location is 90% of the battle, then adding and subtracting weight is not that hard.

The fan I balanced was a 64mm 5 blade EDO fan like that is in many of the stock ARF EDFs that are sold these days. I have flown this fan unit before and I was amazed to see how out of balance it actually was. The photo shows the tape I applied and now it runs like a top. I am quite impressed with this unit and highly recommend it. The total cost was about $230 shipped from the UK which may seem high but in reality the amount of money we spend on our EDF models it is not a large cost at all. Not to mention the time you will save balancing your rotors. I expect that a fan can be done in about 5 minutes once you are use to the process. I know I have spent a LOT or time and frustration trying to balance a fan and to me this unit is worth every penny!

I will post photos the next time a balance a rotor you can all see it in action.
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Old Jul 18, 2009, 11:40 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
20,902 Posts
that is sweet! id love to have one of those!
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Old Jul 19, 2009, 12:09 AM
WiggleWiggleWiggle
ozzi supercub's Avatar
South Australia
Joined Jan 2008
6,047 Posts
That is awesome Don. Nothing sounds sweeter than a well balanced EDF. Most EDF's your hear scream and don't sound quite right. A well balanced fan should have a beautiful sound.
Would love to learn more about the process. The videos on the site don't really make it clear.
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Old Jul 19, 2009, 04:58 AM
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Bob Blackburn's Avatar
UK, Greater Manchester, Manchester
Joined Jul 2004
353 Posts
Ozzi

You can download the manual it is a bit clearer what the videos are showing once you know what is going on.

http://www.bobsworkshop.co.uk/outdoo...d-fan-balancer
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Old Jul 19, 2009, 08:32 AM
Software always has bugs
United States, TX, Missouri City
Joined Nov 2008
261 Posts
Just have an additional idea to improve the current design. That is if a PLL circuit is implemented with a few strain gauges, the weight could be defined easier.
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Old Jul 19, 2009, 05:29 PM
life is an oyster. shuck it!
istandalone's Avatar
bennington, VT
Joined Mar 2008
3,183 Posts
i was under the impression that dynamic balancers were in the $10,000's range?? or is that harmonic balancers?
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Old Jul 20, 2009, 08:20 AM
Software always has bugs
United States, TX, Missouri City
Joined Nov 2008
261 Posts
It could be called a harmonic balancer when your strobe light locked at the rotor's harmonic frequency.
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Old Jul 20, 2009, 09:52 AM
"Marcy" VF-A
wekenav8r's Avatar
Marysville, WA
Joined Jul 2004
193 Posts
That's very nice Don!
Will you be offering motor/fan combos that have been balanced for sale in the future?
Thanks, Tim
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Old Jul 20, 2009, 05:04 PM
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lavochkin's Avatar
Mokena,Illinois -United States
Joined Oct 2006
5,833 Posts
I just received mine over the weekend. Now let the balancing begin!!!!! LOL!!!
I have talked to Bob about a year ago and he said he will offfer these again. Luckily again was now. So I jumped onto it. Don do you know how big of a fan it can handle??? I am hoping at least up to a 90mm.
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Old Jul 22, 2009, 06:58 PM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
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Well I know it will hold a 70mm HET fan but I do not have any bigger fans.

Don
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Old Jul 23, 2009, 09:56 AM
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Bob Blackburn's Avatar
UK, Greater Manchester, Manchester
Joined Jul 2004
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it should be possible to do 100mm and larger.

I have done 90mm fans no problem!
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Old Aug 09, 2009, 10:10 AM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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Bob,

I hope you do not mind, I have resized the embedded photos as they were huge in size (memory wise). The manual looks identical now but went from 16MB down to 111kb! Much easier to download.

Don
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Old Aug 10, 2009, 02:04 AM
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Bob Blackburn's Avatar
UK, Greater Manchester, Manchester
Joined Jul 2004
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Sorry folks I had missed that one.

The download from the website is now the small version.

http://www.bobsworkshop.co.uk/outdoo...d-fan-balancer
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Old Aug 10, 2009, 04:23 PM
Yes..ok..maybe..lol.....
Tucson Avra Valley, Arizona, United States
Joined Jul 2004
5,688 Posts
Purchased a balanced fan unit from Don. 64mm fan with a wicked 4000 on 4s.
All I can say is wow!!!!!!!!!!!!!!!! very smooth. Thanks Don!!
-Dave
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Old Aug 10, 2009, 11:59 PM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
12,799 Posts
Amazing the difference it makes!!!
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