Hirobo HI0403238 GPH 346 Main Frame Replacement  [HI0403238]

How the Main Frame Affects Flight

The HI0403238 main frame is a replacement airframe centrepiece for GPH 346 series helicopters, providing the structural layout for the tail boom, landing gear, and rotor head. This section emphasises how fit and alignment influence setup, balance, and in-flight responsiveness.

Compatibility: listed for GPH 346 models; confirm the HI0403238 part number against your kit to ensure correct fit. Avoid assuming interchangeability with other series unless clearly documented by the supplier.

Installation notes: remove servos, gyros, batteries and linkages prior to replacing the frame, label fasteners during disassembly, and inspect bearing bosses for wear. Where possible reuse original hardware and check straightness of the rotor head and tail boom during reassembly. Small thickness shims or thread-lock applied judiciously can reduce loosening during early flights.

Tuning role: the main frame dictates component positions and overall torsional stiffness; even subtle misplacement can cause vibration, tracking or cyclic inconsistencies. After fitting a new frame, re-establish rotor head geometry, swashplate centring, and tail pitch settings to regain predictable cyclic response and steady rotor RPM under load.