Hirobo EAGLE EX Main Frame HI0404687 Upgrade  [HI0404687]

Replacement Main Frame for Eagle Platforms

This main frame fits Hirobo Eagle family airframes and provides the structural backbone that locates servos, motor mount points and boom fittings. It is intended as a replacement part for maintenance, repair or full chassis rebuilds on compatible Eagle, Freya, EX and SX models.

The design prioritises correct alignment and part location over cosmetic surface finish. During fitting, make sure mounting points line up, check for sufficient component clearance, confirm that screws seat correctly, and inspect boom junctions for balanced load distribution. Because the frame defines the baseline geometry for rotor head and tail parts, accurate positioning is important for consistent handling.

In terms of setup, installing a new main frame restores the original mounting geometry and helps retain earlier pitch, cyclic and tail trim settings, so subsequent tuning work behaves more predictably.

Choose this main frame when you need to recover factory geometry on a compatible Eagle-series helicopter, and follow standard installation checks to preserve stable flight characteristics.