Since its introduction the Avant line broke the mold with advances in design that are now slowly being imitated by other helicopter manufacturers. We now introduce the Avant EFX. The most advanced 3D RC-Helicopter to date. Its next generation design allows it to perform far better than any other heli currently available in the market.

• CCPM system with common arm rotation axis virtually eliminates interaction
• Non-stacked carbon frames
• Head modifications change flybar ratios, delta ratios and swashplate to blades ratios for an optimized response for hard-core 3D flying.


• Very light construction for a very high power-to-weight ratio.


• High engine location for low mass moment of inertia that increases response for rotations around the CG such as rolling and flipping.
• Tank location close to the CG minimizes trim changes


• Compatible with 7.92 and 8.45 ratios and with a


• NEW 8.08 gear ratio for the OS 91 series engines


• Hard-Core 3D flight response as a result of a low flybar ratio and high swashplate to blades ratio


• Slim profile lightweight fiberglass canopy


• Stiffening structure for extreme rigidity at the gears interface


• Easy access to engine and radio.


• Full Push-Pull control system with thicker rods eliminates play

The Avant EFX and FX feature a CCPM system that uses a common center of rotation that virtually eliminates the interaction commonly found on other systems.

In the Avant CCPM system when the front lever raises or lowers it comes closer to the mainshaft. At the same time when the two back levers raise or lower they also come closer to the mainshaft thereby canceling the non-linearity of the front one and vice-versa. Notice that this error cancellation effect is true both for when both the front and back are raised as well as when one of them is raised and the other lowered.

The heaviest piece in any helicopter is the engine and its distance away from the center of gravity heavily affects how easy a helicopter can rotate around its CG. A larger distance will force the blades work harder to move the engine around the CG when doing flips or rolls.

This effect is achieved in the Avant EFX and FX by having the main gear above the tailboom instead of below as most helicopters. The main gear determines where the pinion is located and consequently where the engine is located.

The Avant EFX features head modifications that allow the head to be adjusted in a wider range of ratios. From ratios optimized for hard-core 3D flying to all around mild response they are all easily adjusted by simply selecting the right ball locations or delta spacers. Simple instructions guide you for the right selection of settings.

Delta spacers allow for adjustment of the blade's delta response by simply selecting one of the three different thickness provided with the kit.

click on image for larger view

click on image for larger view

Full Push-Pull control system with thicker rods eliminates play as well as shear forces to the servo.

The Push-Pull system transfers the torque of the servo directly to the levers. This eliminates the shearing force that wears out the servo bearings when they take lateral forces. Thicker rods prevent the rods from bending under compression.

Serviceability and easy access is a major driving force in the design of the Avant EFX and FX. Easy engine access as well as radio and fuel tank access allow for easy servicing of those parts at the field.

The Avant EFX and FX feature a lightweight fiberglass canopy with a very small cross-section that lowers the drag coefficient helping keep the momentum on large maneuvers or fast passes.