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600 Class Nitro Helicopters 600 Class Nitro Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 06-03-2009, 12:21 PM   #1 (permalink)
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Default Balancing the fan

I balanced the fan and hub with the clutch attached. Should I have not balanced it with the clutch installed to the hub?
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Old 06-03-2009, 01:40 PM   #2 (permalink)
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It doesn't really matter. The clutch will deform as it expands to contact the liner, so the balance will shift anyway. Plus, the center of rotational mass of the clutch never gets very far away from the hub, so it won't impact the balance much. The fan itself is more critical.

For the record, I always balanced mine with the clutch attached and used a Sharpie to mark the alignment so that something didn't get rotated 180 degrees during installation onto the engine.
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Old 06-03-2009, 06:39 PM   #3 (permalink)
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There really is no point in balancing a clutch as the clutch will change shape during operation.
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Old 06-03-2009, 09:05 PM   #4 (permalink)
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I balance the fan with the hubb only. The clutch is machined very nicely. So no need to balance that, asside from the expanding issue.
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Old 06-04-2009, 04:34 PM   #5 (permalink)
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what are you gents using to balance the fan?
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Old 06-04-2009, 05:15 PM   #6 (permalink)
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Quote:
Originally Posted by wacs818 View Post
what are you gents using to balance the fan?
A Dremel tool (seriously). Linked again for your viewing pleasure...

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Old 06-04-2009, 05:15 PM   #7 (permalink)
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I didn't balance mine, it seemd like an optional thing, but I woulds have if I knew of a way to do it.
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Old 06-05-2009, 03:43 AM   #8 (permalink)
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Agreed Alan, anything which rotates should be balanced.........
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Old 06-05-2009, 09:47 AM   #9 (permalink)
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How do you know which part of the fan to apply the dremel tool, is there a name for the rig on which the fan is allowed to spin freely?
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Old 06-05-2009, 10:42 AM   #10 (permalink)
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Quote:
Originally Posted by wacs818 View Post
How do you know which part of the fan to apply the dremel tool, is there a name for the rig on which the fan is allowed to spin freely?

If the arbor hole in the fan is of a size to fit, here is what I would use:

http://www3.towerhobbies.com/cgi-bin...?&I=LXHY61&P=M

Which ever side of the fan goes to the bottom is the heaviest. Remove a little metal and spin again. Keep doing this until no one side stops at the bottom continuously.

Bob

Last edited by Bayward; 06-05-2009 at 10:44 AM.. Reason: Added comment on useage.
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Old 06-05-2009, 10:53 AM   #11 (permalink)
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This one is better IMO:

http://www3.towerhobbies.com/cgi-bin...&I=LXD712&P=ML

The included shaft and clamping pieces work with the T-Rex 600N hub quite well.

The nice thing about this one is that you have an over/under capability, which came in really handy for balancing paddles with them mounted on the head: I just put the head on a spare main shaft with the flybar and paddles attached and set the heights of the two sides of the balancer so that the head end of the shaft/head assembly went on top of the one side and the other end went through the hole in the other side. Since the head end is heavier than the other end, one side of the balancer essentially became a fulcrum and the other end became a stop to keep the shaft from toppling off the balancer.
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Old 06-05-2009, 03:03 PM   #12 (permalink)
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Great stuff thanks gents, been having a slight wobble on my heli on startup after overhauling my heli, and am now wondering if it could be a fan issue, definitely something I would get on a rebuild or my next nitro build
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Old 06-05-2009, 03:14 PM   #13 (permalink)
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Quote:
Originally Posted by wacs818 View Post
Great stuff thanks gents, been having a slight wobble on my heli on startup after overhauling my heli, and am now wondering if it could be a fan issue, definitely something I would get on a rebuild or my next nitro build
A "wobble" in my interpretation of the word is probably not engine related unless there's some sort of harmonic oscillation going on. It's more likely to be head/main shaft related.
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Old 06-06-2009, 07:51 AM   #14 (permalink)
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Quote:
Originally Posted by TheBum View Post
This one is better IMO:

http://www3.towerhobbies.com/cgi-bin...&I=LXD712&P=ML

The included shaft and clamping pieces work with the T-Rex 600N hub quite well.

The nice thing about this one is that you have an over/under capability, which came in really handy for balancing paddles with them mounted on the head: I just put the head on a spare main shaft with the flybar and paddles attached and set the heights of the two sides of the balancer so that the head end of the shaft/head assembly went on top of the one side and the other end went through the hole in the other side. Since the head end is heavier than the other end, one side of the balancer essentially became a fulcrum and the other end became a stop to keep the shaft from toppling off the balancer.

I still need to balance my flybar, but I wasn't sure how to tackle this one.
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Old 06-06-2009, 07:52 AM   #15 (permalink)
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I just pulled my fan back off, removed the clutch, and rebalanced it and the fan assemble was out of balance. So I will not be balancing mine with the clutch on anymore, since the clutch changes overtime.
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Old 06-06-2009, 09:41 AM   #16 (permalink)
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Quote:
Originally Posted by Felt View Post
I still need to balance my flybar, but I wasn't sure how to tackle this one.
It's also a good way to balance the main blades, if you don't mind the extra work of taking the head off. If at some point you had to replace the head and not because the CNC was bent, it would make a dandy blade balancer.
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