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Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

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Old 02-20-2011, 11:46 AM   #1
Reindeer
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Default Balancing an EDF impeller... magnetic balancer vs knife edge balancer

Hey everyone! Hope your model building season is going great!

OK, I have a question... putting together a Squall EDF, and are getting ready to balance the impeller for the EDF unit. Now, from what I have seen, most people seem to be using a magnetic balancer to do the job. I do understand the advantages of using magnets as there is no friction on the balancing shaft and therefore should obtain the most accurate results.

However, right now I own a Dubro 499 Tru-Spin prop balancer. Difference is that this unit uses a series of knife edge wheels to support the balance shaft. Thus far I have used this balancer on a LOT of props, wheels, along with a few heli head assemblies, and the results have always been satisfactory, at least for my purposes.

So the questions I have is how much of a difference would there be between the two units, and would it really be worth spending the extra $25 - $30 delivered to get a magnetic balancer?

Thank you!
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Old 02-21-2011, 08:22 AM   #2
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Default

I have the old Hi-Point balancer, I believe it is simply the original version of the unit you have. I also have 2 of the magnetic balancers.

I'll probably start something but I have more confidence, in the wheel type Hi-Point unit.

I have spun the empty shaft on both, and the wheel type takes far longer to stop, there must be some friction in the magnet type.

I keep the magnet type in my field box, and the other one at home.

I did see some instructions written by the mfg, telling how to polish the magnets, or put some kind of covering on them to reduce friction, also to polish the ends of the shafts.

If you would like, I will sell you a brand new, unopened, TF precision magnetic balancer, for $20 delivered

Dave R, Proud PGR rider.
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You become a master at repair.
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Old 02-22-2011, 07:50 PM   #3
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Default magnetic balancer

Magnetic balancers are great when they have a true shaft and true centering cones (mine does not). Your balancer may be adequate. I've found that even when the fan is balanced, the spinner can throw everything out and it must be repositioned until it runs smooth. The motors can also throw the assembly out but repositioning a slightly out of balance spinner can fix it.
Just apply power slowly the first few runs and if vibration is noticed reposition the spinner a partial turn and try again. Once you find the "sweet spot" mark it so it can be reassembled in the right place in the future.
Cheers
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