FAQ: MicroVib II Balancing: Rotor Geometry

The MicroVib II uses two different methods of defining the rotor geometry when balancing.

If a balance task is selected which uses Standard Rotor mode, the MicroVib II will only know a default weight sensitivity and tach offset. Nothing is known about the rotor geometry ahead of time. While balancing, the operator will measure the weight location angles with the Prop/Rotor Protractor and then hand enter the locations into the MicroVib II.

If a balance task is selected which uses Program Rotor mode, the MicroVib II will know a default weight sensitivity, tach offset and also the basic geometry of the rotor. Each valid location angle and corresponding radius value will be automatically selected for the aircraft when the operators selects the task.

• MicroVib II doesn't know rotor geometry ahead of time.
• Operator measures adjustment locations with Prop/Rotor Protractor
• Operator hand enters desired locations into MicroVib II Solution Generator
• Location Radii are assumed to be equal (MV2 internal calculations assume radius = 1.0)
• Adjustments are always expressed in WTS
• Supports any number of weight locations
• Initial balance solution is ideal (non-split)
• Operator chooses initial weight location close to the ideal location
• Operator is expected to manually split solutions beginning with Run 2
• Typically used with Props, Fans, Shafts and a few helicopter rotors (Bell 206 T/R for example).

• MicroVib II knows aircraft specific rotor geometry ahead of time (locations and radii).
• Operator selects desired valid locations from MicroVib II menu
• Adjustments are labeled as GRAMS, FLATS, POINTS, PLATES, etc.
• Supports maximum of eight locations.
• All balance solutions are split between two valid locations.
• Operator can select a different set of locations by pressing the NEW SPLIT key.
• Typically used for most helicopter rotors, particularly those with mixed radii (AS-350 T/R for example)

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