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wjvail
rrElite Veteran Meridian, Mississippi 💎Sustaining Member 
That is completely wrong.
When you balance blades . . . you are in fact balancing the moments. 
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AirWolfRC
rrProfessor 42½ N, 83½ W 
It's hard to have respect for false information . . .As far as qualifications go . . . yea . . . me too but my degrees are ME & EE 
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BobOD
rrElite Veteran New York USA 

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AirWolfRC
rrProfessor 42½ N, 83½ W 

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BobOD
rrElite Veteran New York USA 

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AirWolfRC
rrProfessor 42½ N, 83½ W 
. . . and then it's F = M x D X angularvelocityÂ² 
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BobOD
rrElite Veteran New York USA 
And the torque equation above is correct.You are talking about a static moment...mass x r 
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AirWolfRC
rrProfessor 42½ N, 83½ W 

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wjvail
rrElite Veteran Meridian, Mississippi 💎Sustaining Member 

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AirWolfRC
rrProfessor 42½ N, 83½ W 
Let's say you are in a steady state flight condition, everything is smooth. You pull collective. The head speed slows slightly. Because the blades have a slightly different Polar Moment of Inertia, one blade will lead the other slightly limited only by centrifugal force. The offset to the line between the two blade CG's from the center of the main shaft will be the tangent of the angle difference between lead/lag angles of the blades and cause a slight temporary vibration.As soon as the speed variation has steadied , everything will be back to normal.How much is this perturbation ? Off hand I would call it splitting a gnat hair. We don't have that kind of budget for equipment to find out. 
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icanfly
rrElite Veteran ontario 
AirWolfRC, when a balanced pair of blades with different CG points goes through an angular acceleration, is the torque applied to the mast exactly the same for both blades? I'm curious if you feel they would be the same or just negligibly different. 
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BobOD
rrElite Veteran New York USA 
The math says balancing the moment without balancing the inertia can lead to vibration. One can question the significance but first we need to realize they are not the same. 
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turboomni
rrProfessor East of the Equator 

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icanfly
rrElite Veteran ontario 
balancing the inertia 
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BobOD
rrElite Veteran New York USA 
aren't the moment and inertial moment the same thing, 
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AirWolfRC
rrProfessor 42½ N, 83½ W 

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BobOD
rrElite Veteran New York USA 

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icanfly
rrElite Veteran ontario 
Pitch and roll accelerations as well. 
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