Trex-G4-FBL
The Align T-Rex G4 FBL — Align's flagship 450-class flybarless competition helicopter, the airframe behind a generation of competition 3D rotorcraft pilots.
About
The Align T-Rex is a long-running collective-pitch helicopter family from Align Corporation of Taiwan, one of the dominant RC helicopter manufacturers worldwide since the company's founding. The T-Rex line spans every scale from sub-micro through giant-scale, with the 450-class size being one of the most popular for outdoor 3D flying — small enough to transport in a small car, large enough to fly outdoors in modest wind, and at a price point accessible to club-budget pilots.
The "G4" designation refers to a specific generation of T-Rex 450 mechanics, while "FBL" stands for "Flybarless" — a control scheme that replaced the traditional Bell-Hiller flybar with electronic gyroscopic stabilization, dramatically improving heli responsiveness and 3D capability. Flybarless mechanical layouts became dominant in competition 3D flying through the late 2000s and 2010s.
Like every well-loved T-Rex, the G4 FBL earns its place in the hobby by being three things at once: capable enough for unlimited 3D competition, mechanically sound enough that field-side maintenance is practical, and supported by a worldwide parts supply that makes long-term ownership economical.
In the simulator
A demanding 3D helicopter that rewards stick discipline. Use it for collective-pitch helicopter practice with the kind of competition 3D capability that 450-class flybarless helis are designed for.
