Hirobo HI0404652 L=500 Tail Boom Brace Compatible with Eagle/Freya/EX/SX  [HI0404652]

Tail boom brace explained

This brace set is produced for use with Hirobo Eagle, Freya, EX and SX helicopters. The HI0404652 refers to the part number while L=500 indicates the length matched to those tail booms.

The brace's purpose is to stiffen the boom assembly to maintain alignment under load and offer a consistent reference when tuning tail stiffness and damping. This reduces free play and helps deliver steadier tail pitch and yaw responses during test flights.

Installation notes for model builders and tuners:

• Position the brace so its mounting points align with the existing boom supports and clamp locations on your helicopter.
• Apply even torque to all fasteners to avoid bending the boom or creating preload that affects alignment.
• Once installed, check tail rotor tracking and tail pitch response at low throttle, then re-check under hover to confirm any changes.

Practical tuning tips:

• Adjust tail rigidity incrementally and test between changes; small steps typically yield the most controllable results.
• If vibration appears after fitting the brace, verify mounting symmetry and boom straightness before making other changes such as altering tail rotor blades or gyro gains.
• Use the brace alongside proper linkage geometry and servo centring checks for a complete tail setup.