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Old Jul 08, 2014, 02:57 PM
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Canada, BC, Vancouver
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Prop Balance issue

Have a look at the video below and explain to me please how a prop can be heavy and light on the same side?
I have 6 of these cf props and cannot balance them.
The balancer is magnetic with an air gap.

I bought the props from Range video http://www.rangevideo.com/en/



propb (0 min 14 sec)
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Last edited by tymrunner; Jul 08, 2014 at 03:09 PM.
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Old Jul 08, 2014, 03:13 PM
Multirotors, Planes, LOS, FPV
United States, MO, Moscow Mills
Joined Oct 2013
169 Posts
I would have no issues flying with that prop.
I think the issue here is the hole is ever so slightly offset which could be causing this slight movement.
If you spin that up do you notice any vibration? If not, go ahead and use it.
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Old Jul 08, 2014, 03:27 PM
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Canada, BC, Vancouver
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Quote:
Originally Posted by MrMikeMartin View Post
I would have no issues flying with that prop.
I think the issue here is the hole is ever so slightly offset which could be causing this slight movement.
If you spin that up do you notice any vibration? If not, go ahead and use it.
I have significant jello in my video so I am checking motors and props. I want to understand the dynamics of this. They balance horizontal but not @ 45. I am suspected the center hole being off and checked it with my dial indicator and it seems to be centered.
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Old Jul 08, 2014, 03:54 PM
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United States, OR, Mt Hood
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Simply balancing blades is not all of propeller balancing. One also needs to balance the hubs, which is a separate activity.
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Old Jul 08, 2014, 03:55 PM
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United States, PA, Doylestown
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The 'hub' is considered out of balance.
Add drops of CA the the light side of the hub until balanced.
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Old Jul 09, 2014, 02:19 AM
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Canada, BC, Vancouver
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Quote:
Originally Posted by waltr View Post
The 'hub' is considered out of balance.
Add drops of CA the the light side of the hub until balanced.
Well, that is what I did to the prop and it didn't work. As you can see from the video it is both heavy above horizontal and light below it?
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Old Jul 09, 2014, 04:33 PM
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Canada, BC, Vancouver
Joined Mar 2014
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I have balanced the props from Range Video. 3 are pretty good just needing a little blade tweaking but the other 3 are way off in the hub area. My guess is the holes are off.
I rebuilt the balance rig to make sure it wasn't the issue. I am now getting repetitive results so I know it is good.

Range Video has looked at the picture below and is sending me 3 new props. They have not mentioned whether they want the bad ones back or not after seeing the pics. I hope not, that will be expensive. I have been pretty happy with the service from those guys so far. Will see how this turns out.

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