Hirobo HI0404001 Mixing Arm Compatible with Eagle, Freya, EX and SX  [HI0404001]

Replacement mixing arm for Hirobo models

This mixing arm is an RC-scale replacement listed among Hirobo common helicopter parts for the Eagle, Freya, EX and SX series. It acts as the blending interface that combines servo outputs for pitch and tail mixing on model helicopters.

Fit this part when returning linkage geometry to specification or when swapping out a fatigued or broken mixing arm. It uses the standard mounting points shared by the Eagle/Freya/EX/SX common parts group, so double-check your airframe mounts before ordering.

Installation guidance: remove swashplate linkages and any obstructing servo rods to access and remove the old arm, transfer bearings or pins where applicable, and verify smooth, free movement across the entire collective and tail sweep. Re-center blade pitch and retune transmitter mixes and endpoints after reassembly.

Tuning note: the mixing arm provides a fixed pivot in the mechanical mixing chain; adjust control feel using transmitter mixing or by changing outer linkage lengths rather than modifying the arm itself.