Product Details
The E-flite® 4-Site 3D FF is a biplane alternative to the extremely popular Eratix 3D FF that offers the aggressive aerobatic plus smooth sport and slow-flying performance of similar class models - without all the hassles of buying components for and building one because it bolts and snaps together in no time!Key Features
- The easiest to buy, assemble and fly biplane flat foamy model yet - capable of slow cruising, sport flying, basic and all-out 3D aerobatics
- Specially tuned brushless motor that's factory-installed and ready for use with popular 3S 850-1000mAh batteries
- 30-amp Spektrum Avian™ Smart ESC provides real-time battery voltage, current, RPM and other data via compatible receivers and transmitters
- Spektrum™ AR630+ receiver with fly-by range telemetry and industry-leading DSMX® technology
- Easier to fly with innovative and optional-use SAFE Select flight envelope protection (BNF Basic version only)
In The Box - (1) E-flite 4-Site 3D FF 860mm with:
- (1) Spektrum Avian Brushless Outrunner Motor (installed)
- (1) Spektrum Avian 30-Amp Smart Lite Brushless ESC (installed)
- (3) Spektrum Sub-Micro Digital, Metal-Geared Servos (installed)
- (1) Spektrum AR630+ Receiver with AS3X+ and SAFE Select (installed) (BNF Basic version only)
- (1) Product Manual
Needed to Complete- Full-range 4-5+ channel Spektrum DSMX®/DSM2® compatible transmitter
- 3S 11.1V 850-1000mAh LiPo with IC2® Connector
- Compatible LiPo charger
E-flite 4-Site 3D FF RC Airplane Introduction
In the early 2000s, "flat foamy" models were extremely popular because they could be scratch-built from foam sheets you could buy in many stores. Today, most foam models are fully moulded sport and scale aircraft – and few can match the unique capabilities and performance of flat foam models, especially those designed and built for aerobatic plus 3D flying! The E-flite® 4-Site 3D FF (Flat Foamy) 800mm is based on the original F3P and UMX models and is a biplane alternative to the popular Eratix 3D FF that's taken the market by storm. It's perfect for experienced pilots who already build and fly flat foam models, intermediate pilots who are interested in them but don't want to undertake a complicated build, and less experienced pilots who have always wanted to try but were intimidated by the extra effort and skills required to buy, build and fly such a model. The 4-Site 3D FF is the easiest to fly, most convenient, and best value in a biplane flat foamy model yet!
E-flite 4-Site 3D FF RC Airplane Overview
The E-flite® 4-Site 3D FF (Flat Foamy) 800mm offers the aggressive aerobatic plus smooth sport and slow-flying performance of similar class models – without all the hassles of buying components for and building one! It bolts and snaps together so it can be ready to fly in less time than it takes to charge a battery compared to the glue, tape, and many hours it usually takes to assemble other "flat foamy" aircraft. It's a biplane alternative to the best-selling Eratix 3D FF with a shorter wingspan but more wing area for lower wing loading overall. Its lightweight yet extremely durable EPP airframe is mostly factory-assembled and includes three durable and precise metal-geared servos on all the control surfaces. The factory-installed power system features a 3S-compatible brushless motor matched to a Spektrum Avian Smart ESC compatible with Smart and non-Smart 850–1000mAh batteries. The BNF Basic version is also equipped with an AR630+ receiver to deliver real-time telemetry data, enhanced AS3X+, and optional-use SAFE Select technologies. It's small enough and light enough to be flown indoors in gymnasiums and other similar spaces or outdoors in yards, parks, and sports fields, making it a versatile addition to the hangar for a wide range of pilots!
Overview
The E-flite 4-Site 3D FF (Flat Foamy) 800mm BNF Basic with AS3X+ and SAFE Select represents a significant milestone in ready-to-fly RC aircraft design. This biplane flat foamy model is a factory-finished alternative to the extremely popular Eratix 3D FF, offering experienced RC pilots and those transitioning into aerobatic flying a genuinely accessible entry point into the world of precision 3D flight. Unlike traditional flat foam models that require scratch-building from foam sheets and extensive component sourcing, the 4-Site 3D FF bolts and snaps together in under one hour, eliminating the hassles that have traditionally deterred intermediate and beginner pilots from exploring this exciting aircraft category.
Based on the original F3P and UMX design lineage, this brushless RC aircraft delivers the aggressive aerobatic plus smooth sport and slow-flying performance characteristics of similar class models without requiring you to build components or assemble complex systems yourself. Whether you are a seasoned flat foamy enthusiast looking for convenience, an intermediate RC pilot curious about 3D flying, or a less experienced flyer who has always been intimidated by the effort required to build such a model, the 4-Site 3D FF is the easiest to buy, assemble and fly biplane flat foamy model yet. It is perfect for UK RC enthusiasts seeking a ready-to-run RC aircraft that combines factory quality with genuine aerobatic capability.
The aircraft's high-density EPP (expanded polypropylene) airframe combines lightweight construction with exceptional durability, featuring carbon fibre and composite reinforcements throughout the structure. Factory-finished in a high-contrast, high-visibility trim scheme, the 4-Site 3D FF offers excellent orientation during flight, making it easier to track your aircraft position during complex manoeuvres. All essential electronics come pre-installed and ready for use—simply bind your compatible Spektrum transmitter, add a 3S battery, and you are ready to fly.
Key Features
- Smart Transmitter File Technology — The Spektrum AR630+ receiver is loaded with a Smart Transmitter File that allows you to import all settings for Spektrum NX and iX series transmitters during the binding process, eliminating manual setup steps and ensuring optimal configuration from your first flight.
- Enhanced AS3X+ Stability System — This exclusive and enhanced stability technology delivers the unmatched locked-in feel that experienced 3D pilots demand, automatically compensating for wind and flight disturbances whilst allowing full aerobatic freedom when you command it.
- Optional SAFE Select Flight Envelope Protection — Available on this BNF Basic version, SAFE Select provides easier flight with innovative flight envelope protection that can be toggled on or off, making the aircraft more forgiving for less experienced pilots whilst remaining completely optional for those seeking unrestricted aerobatic capability.
- Factory-Installed Brushless Motor System — The specially tuned 2408-1300Kv brushless Spektrum outrunner motor is installed and ready for use with popular 3S 850-1000mAh batteries, delivering responsive power and consistent performance across the aircraft's entire flight envelope from slow cruising to aggressive 3D manoeuvres.
- 30-Amp Smart ESC with Real-Time Telemetry — The Spektrum Avian 30-Amp Smart Lite brushless ESC provides real-time battery voltage, current, RPM and other flight data via compatible receivers and transmitters, allowing you to monitor your aircraft's health throughout every flight session.
- Three Factory-Installed Metal-Geared Digital Servos — Spektrum sub-micro digital, metal-geared servos come pre-installed on all control surfaces, eliminating assembly requirements and ensuring precise, responsive control authority for both gentle sport flying and demanding 3D aerobatics.
- Fast Glue-Free Assembly — Unlike similar class models, the 4-Site 3D FF requires no glue or tape for assembly; components bolt and snap together in less than one hour, making it genuinely accessible to pilots without building experience.
- Snap-In Landing Gear System — The landing gear snaps into place for easy installation, removal and replacement, allowing you to quickly swap between gear setups or perform maintenance without tools or adhesives.
- Industry-Leading DSMX Technology — The Spektrum AR630+ receiver uses DSMX (Digital Spektrum Multiplexing) technology, providing secure, full-range control with exceptional interference rejection and compatibility with all Spektrum DSMX and DSM2 transmitters.
- Durable High-Density EPP Airframe — The extremely durable yet lightweight EPP airframe with carbon fibre and composite reinforcements withstands the rigours of aggressive aerobatic flying whilst remaining light enough for smooth, slow-speed flight characteristics.
Technical Performance
The E-flite 4-Site 3D FF delivers exceptional versatility across a remarkable performance envelope. Its 2408-1300Kv brushless motor, paired with the 30-Amp Spektrum Avian Smart Lite ESC, generates sufficient power for aggressive 3D aerobatics whilst maintaining the smooth, controlled response necessary for gentle sport flying and confident slow-speed manoeuvres. The aircraft weighs just 447 grammes without battery and approximately 519 grammes with the recommended 3S 850mAh LiPo battery, placing it in the ultra-micro category that combines light weight with structural integrity. The 800mm (31.5-inch) wingspan provides outstanding lift characteristics and glide performance, whilst the 917mm fuselage length delivers the precise mass distribution necessary for predictable handling across all flight regimes. The electric power system ensures instant throttle response, quiet operation, and minimal ongoing maintenance compared to nitro-powered alternatives. With a centre of gravity range of 80-91mm (optimal setting 87mm), the aircraft is inherently stable yet responsive, providing the perfect platform for developing advanced aerobatic skills. The 9 x 4.6 propeller has been selected to optimise performance with the specified motor and battery combination, delivering efficient power conversion across the entire throttle range. All critical flight control surfaces are actuated by precision-engineered, factory-installed metal-geared digital servos that provide the rapid response and holding power necessary for 3D flight without lag or creep. The IC2 connector standardisation ensures safe, reliable battery connections and compatibility with the expanding Spektrum battery ecosystem.
What's in the Box
- E-flite 4-Site 3D FF airframe (800mm wingspan)
- Spektrum brushless outrunner motor (2408-1300Kv, installed)
- Spektrum Avian 30-Amp Smart Lite brushless ESC (installed)
- Three Spektrum sub-micro digital, metal-geared servos (installed on all control surfaces)
- Spektrum AR630+ receiver with AS3X+ and SAFE Select (installed)
- Product manual with assembly and setup instructions
What You Need to Complete
- Full-range 4–5+ channel Spektrum DSMX®/DSM2® compatible transmitter (not included; compatible with Spektrum DXS transmitters supplied with popular E-flite and HobbyZone trainer models)
- 3S 11.1V 850–1000mAh LiPo battery with IC2 connector (not included; sold separately)
- Compatible LiPo charger with suitable IC2 adapter/charge lead such as the SPMXCA320 (sold separately)
Frequently Asked Questions
- Is the E-flite 4-Site 3D FF suitable for beginners? — The 4-Site 3D FF is designated as a Skill Level 3 aircraft, indicating it is designed for experienced and intermediate pilots rather than absolute beginners. However, the optional SAFE Select flight envelope protection makes it more forgiving for less experienced flyers, and the factory-assembled, ready-to-fly design eliminates building complexity that would deter novices. If you are new to RC flying, you should first gain experience with a dedicated trainer aircraft before progressing to this model.
- What battery does the E-flite 4-Site 3D FF require? — The aircraft requires a 3S 11.1V LiPo battery with a capacity of 850–1000mAh and an IC2 connector. These batteries are readily available from RC retailers across the UK and are among the most popular battery sizes for electric RC aircraft. Batteries are sold separately; you will also need a compatible LiPo charger with an IC2 adapter.
- How long does assembly take? — Approximate assembly time is less than one hour. Unlike traditional flat foam scratch-builds, the 4-Site 3D FF requires only bolting and snapping components together with no glue or tape required, making it genuinely accessible to pilots without building experience.
- What is the difference between the 4-Site 3D FF and the Eratix 3D FF? — The 4-Site 3D FF is a biplane alternative to the popular Eratix 3D FF monoplane. Both aircraft offer aggressive aerobatic plus smooth sport and slow-flying performance, but the biplane configuration of the 4-Site provides different handling characteristics and aesthetic appeal. The 4-Site features the same quality Spektrum electronics and smart assembly approach.
- Do I need to buy additional components to start flying? — You will need to purchase a compatible Spektrum transmitter, a 3S LiPo battery with IC2 connector, and a LiPo charger. The aircraft itself includes all necessary electronics, servos, motor and ESC pre-installed and ready for use.
- What transmitters are compatible with this aircraft? — The aircraft requires a full-range 4–5+ channel Spektrum DSMX®/DSM2® compatible transmitter. It is compatible with the Spektrum DXS transmitter supplied with many popular E-flite and HobbyZone trainer models, as well as all other current Spektrum NX and iX series radios.
- Can this aircraft perform true 3D aerobatics? — Yes, the 4-Site 3D FF is specifically designed for aggressive aerobatic plus smooth sport and slow-flying performance. Its lightweight construction, responsive servo system, and powerful brushless motor enable full 3D capability including inverted flight, knife-edge passes, hover and tumbling manoeuvres.
- What makes AS3X+ technology important for this aircraft? — AS3X+ (Artificial Stability 3-aXis Enhanced) provides automatic stabilisation that delivers a locked-in feel during flight, compensating for wind and disturbances whilst remaining completely transparent to your control inputs. This allows you to focus on executing precise manoeuvres rather than fighting environmental factors.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the E-flite 4-Site 3D FF (Flat Foamy) 800mm BNF Basic with AS3X+ and SAFE Select today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
