Hirobo HI2521129 3 x 8 x 3 Collar for Helicopter Linkage Tuning  [HI2521129]

Tuning Impact on Control

The Hirobo HI2521129 collar is an RC-scale component at 3 x 8 x 3 that serves as a spacing sleeve for helicopter assemblies. By holding precise axial positions on small shafts, the collar helps maintain the geometry required for predictable rotor and control behaviour.

To adjust setup, move the collar along the shaft to fine-tune linkage spacing and then secure surrounding hardware as per your airframe instructions. Small changes in collar position can influence blade tracking and cyclic response, so make adjustments incrementally and test in hover.

Monitor the collar during tuning and replace it if signs of wear or excessive play appear. Maintaining exact spacing helps preserve consistent control inputs and reduces vibration from misaligned linkages.