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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › Who balances their Stratus fan?
02-11-2006 07:02 PM  12 years agoPost 1
MAX NITRO

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Armadale Western Australia

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Is it THAT important to balance the nice CNC fan on the Stratus?

I have never balanced a single fan in my life and I have never had any real vib issues from fans before, maby I am just lucky so far...

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02-11-2006 07:03 PM  12 years agoPost 2
pilotError

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Long Island, NY

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Yep
You've been lucky...

Good Judgement comes from Experience. Great Judgement comes from Bad Experience.

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02-11-2006 07:40 PM  12 years agoPost 3
yugi

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Maryland

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It's a must...

Yugi

If you keep doing the same thing…...you’re going to get the same results!

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02-11-2006 08:29 PM  12 years agoPost 4
da_man

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Central NC

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I find it odd that an expensive CNC is not precise enough to make a part with a close balance, but a 30$ balancer is accurate enough to check it. From looking at the material that some people take off of their fans there seems to be a problem somewhere.


I read here before that it doesn't make much difference since there is already a lot of vibration from the piston on the same axis. Also found out that CY never balances fans as well. It was also said that it is much more important that the fan is centered on the engine shaft than the balance.

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02-11-2006 08:37 PM  12 years agoPost 5
MAX NITRO

rrApprentice

Armadale Western Australia

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My point exactly da_man
I wonder why nowhere in the Stratus manual does it mention balancing the fan?
It makes a point of balancing the tail rotor and goes into measuring the runout of the fan, but not balancing..
Maybe MA believes their fan doesn't need balancing?
I remember reading somewhere Curtis doesn't balance his fans either, something to do with the fact that our engines are intrinsically dynamically unbalanced anyway that the small amount of imbalance a good CNC fan has will be negligible. This has led me to question the importance of balancing the fan.
I wonder how many people balanced their fan AFTER it has been run? or they just simply balance due to habit and seed that habit into others?
I could be completely wrong, but I would like some good evidence that CNC fans need balancing.

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02-11-2006 09:04 PM  12 years agoPost 6
tylerexpress

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Bossier City, LA

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Curtis also doesn't install fan magnets either, If you drill the fan for magnets you should re balance

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02-11-2006 09:35 PM  12 years agoPost 7
pilotError

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Long Island, NY

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Balancing
I wonder how many people balanced their fan AFTER it has been run?
A bunch, just do a search in the Min Air forum for "Vibration".
I could be completely wrong, but I would like some good evidence that CNC fans need balancing.
On the Freak forums, there's a good balancing video that shows the fan spun up on the balancer with air. I think its pretty good for showing the need for balancing.

Good Judgement comes from Experience. Great Judgement comes from Bad Experience.

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02-12-2006 03:05 AM  12 years agoPost 8
Toadster25

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Iowa

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I tried to ballance my Alluminum fan on my Spectra G and just ended up making it a big mess. I couldn't get the fan mounted perfectly on the ballacer that I bought. It is the one with magnets that hold it up. I wouldn't ballance it because I think it is imposible to mount it perfecly on a $30 ballacer and it wont be mounted the same on the engine anyway. I've never used govenors but I am sure if you put a magnet on the fan that you would need to counter ballace the magnet.

I've seen the video with the ice and using compressed air to spin the fan. That is what I wanted to do but I don't have a way to mount the fan like he had it mounted and I still don't think you could be sure that it is mounted perfectly.

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02-12-2006 04:16 AM  12 years agoPost 9
tylerexpress

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Bossier City, LA

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I use the balancer with the two magnets to suspend the fan and it work nicely

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02-12-2006 05:31 AM  12 years agoPost 10
MAX NITRO

rrApprentice

Armadale Western Australia

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I have seen the vid and i am not denying that some fans are a little unbalanced but it doesn't really address the question of weather or not it is entierly necessairy.
Most people with vib issues have them due to poor run-out which is more of a major cause of vibs than a slightly unbalanced CNC fan.

Point of note also about governor magnets, If you read the instructions for the Revloc you will note that it only has one magnet, even so there is no mention of rebalancing the fan after the magnet is installed. However he does state to put the magnet oposite the piston so when the piston fires at TDC the magnet is BDC therefore counteracting some of the dynamic imbalance the engine is causing eliminating the need for rebalancing....

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02-13-2006 10:56 AM  12 years agoPost 11
RC Rotortek

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North Yorkshire - England

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I have always balanced my CNC fans using the balancer like Tylerexpress, using two suspension magnets. I always mark the heavy point with a non permanent pen on the underside of the fan, rotate it on the balancing shaft, mark the heavy point, rotate it on the balancing shaft, mark the heavy point........... I do this about 20 times and if you end up with in excess of about 10 different heavy points, you fan is pretty well balanced.

I use governors but only ever use optical pickups. I mask off a silver pick-up area and spray the underside with spectrum matt black paint.

I rebalance after removing the mask in the same way. I have never had to remove material from the CNC fan.

The runout and alignment are absolutley critical, but unless you have a blatent heavy point on your fan, it will not really produce any large contributing factors to vibration.

Work sucks!!

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