Hirobo HI0301049 Precision Blade Balancer  [HI0301049]

RC rotor blade balancing device

This Hirobo XRB blade balancer is an accessory intended to assess and improve the static balance of rotor blades used on RC helicopters. It reveals mass imbalances along the blade span, enabling minor trimming or counterweighting to reduce vibration and improve low-speed control.

The tool is a simple bench instrument used in maintenance: blades sit on the balancer spindle and rotate freely until they find their low point. By observing which side hangs low and adding small weights or removing minute material, operators can achieve neutral balance. The balancer is for diagnostic tuning and does not modify blade geometry.

To use, support the blade root on the spindle, allow settling, record any imbalance, then adjust and recheck until level. Ensure a flat, steady work surface and steady hands to avoid false readings, and take care with blade edges and pitch link areas to avoid damage.