E-flite 4-Site 3D FF – The Ultimate Flat Foamy Biplane, Now at Aerobertics!
A New Era of Flat Foamy Aerobatics
Back in the early 2000s, flat foamy models were incredibly popular, allowing pilots to build their own lightweight aerobatic planes from simple foam sheets. While most modern foam aircraft have transitioned to fully molded designs, few can match the agility, responsiveness, and pure 3D performance of a well-designed flat foamy.
The E-flite® 4-Site 3D FF (Flat Foamy) 800mm is a tribute to the legendary F3P and UMX models, offering a biplane alternative to the best-selling Eratix 3D FF. Whether you're an experienced 3D pilot, an intermediate flyer looking for a new challenge, or a beginner wanting to explore precision aerobatics without the hassle of scratch-building, this model is the easiest to fly, most convenient, and best-value biplane flat foamy yet!
At Aerobertics, we love models that combine innovation, performance, and convenience—and the 4-Site 3D FF checks all the boxes.
Precision Performance Without the Hassle
The 4-Site 3D FF delivers aggressive aerobatics, slow and controlled sport flying, and precise 3D maneuvers—all without the headaches of complex assembly. Unlike traditional flat foamies that require hours of gluing and taping, this model snaps and bolts together in minutes, getting you in the air faster than it takes to charge a battery.
With a lightweight yet ultra-durable EPP airframe, factory-installed electronics, and cutting-edge Spektrum Smart technology, this model is built for indoor and outdoor flying. It’s light enough for gymnasiums and sports halls, yet powerful enough for parks, fields, and backyards.
Why Choose the E-flite 4-Site 3D FF?
Factory-assembled, high-density EPP airframe with carbon fiber and composite reinforcements
Spektrum brushless outrunner motor and 30A Avian Smart Lite ESC for powerful, efficient performance
Three sub-micro metal-geared servos ensure precise, reliable control
BNF Basic version includes the Spektrum AR630+ receiver with AS3X+ and optional SAFE Select for smooth, stabilized flight
Increased wing area compared to the Eratix 3D FF for improved low-speed handling
Designed for 3S 850–1000mAh LiPo batteries, offering a perfect balance of power and flight time
Versatile enough for both indoor and outdoor flying in gymnasiums, parks, and sports fields
Skill Level 3 – Experience Required
Skill Level 3 aircraft, like this one, are suitable for more experienced RC pilots with the skills to assemble, set up, and fly similar class models. This PNP version requires more experience and skills to assemble and fly than the BNF Basic version because you must install a receiver that does not already include properly tuned AS3X+ and SAFE Select technologies. It's not a suitable first-ever RC aircraft for new pilots or first-ever aerobatic/3D model for low-time RC pilots. You should have the experience and skills necessary to assemble and successfully fly models like the E-flite UMX Ultrix, UMX Timber X, T-28 Trojan 1.1m, Sportix 1.1m, Timber X 1.2m, or other similar class models before attempting to fly the 4-Site 3D FF PNP version.
Plug-N-Play® Completion Level
This Plug-N-Play (PNP) version comes out of the box with a factory-installed power system and servos that are ready to connect to the compatible receiver of your choice (sold separately), plus the transmitter and battery you provide (also sold separately). Simply install the receiver, finish any final assembly, and fly!
Smart Technology
The 4-Site 3D FF is equipped with an exclusive Spektrum Avian Smart Lite ESC that can provide a variety of real-time power system-related telemetry data including motor RPM, current, overall battery voltage, and more – with Smart and non-Smart batteries – via compatible receivers (including the AR630+) and Spektrum AirWare equipped transmitters (including the DX6e and DX8e, DX6 G2/3 and DX8 G2, the DX9, NX6 to 20, iX12 to 20 and others) while you fly.
Uniquely Capable
Like other flat foamy models, the 4-Site 3D FF is capable of slow cruising, smooth sport flying, basic aerobatics, and even aggressive 3D flying—all in the same flight! It offers a truly “mild to wild” flight experience that intermediate to experienced pilots will appreciate, whether indoors in gymnasiums or outdoors in yards, parks, sports fields, and beyond.
High Performance
The factory-installed brushless power system features a specially tuned Spektrum outrunner motor. This power system delivers plenty of thrust for unlimited vertical and 3D performance with 3S 850–1000mAh batteries!
Easy Assembly
Unlike other flat foamy models that are only available as kits without power and control components, the 4-Site 3D FF arrives mostly factory-assembled with the power system, servos, and receiver (BNF Basic version only) installed. All you need to do is finish some quick and easy final bolt/snap-together assembly—without the use of glue, tape, or special tools—and you'll be ready to fly in less time than it takes to charge a battery!
Durable Design
Three factory-installed digital servos with metal gears on all the control surfaces, plus construction with carbon fiber and composite-reinforced, high-density EPP, deliver a lightweight yet stiff and durable airframe. In the unfortunate event you damage any airframe parts or components and can't repair them, a full line of replacement/spare parts is readily available.
(1) Full-range 4+ channel transmitter and receiver
(1) 3S 11.1V 850–1000mAh LiPo battery with IC2 connector (or a suitable adapter, sold separately)
(1) Compatible LiPo charger (plus IC2 charge lead or adapter, sold separately)
Fly with Confidence – Only at Aerobertics
The E-flite 4-Site 3D FF is designed for pilots who demand responsive, high-performance 3D flying without the complexity of traditional flat foamies. Easy to assemble, thrilling to fly, and packed with modern technology, this model is a must-have for any aerobatic enthusiast.
At Aerobertics, we are committed to providing the best RC aircraft and components to help you get the most out of your flying experience. Whether you're perfecting precision aerobatics, exploring 3D maneuvers, or looking for a fun and unique RC model, the 4-Site 3D FF is an excellent addition to your collection.
