E-flite 4-Site 3D FF (Flat Foamy) 800mm BNF Basic - The ultimate double-decker for art flight enthusiasts

The model flight market offers a wide range of options for hobby pilots, but especially in the field of artistic double-deckers, a model is particularly striking: the E-flite 4-Site 3D FF BNF Basic with AS3X+ and SAFE Select. This compact art flight wonder with a span of 800mm combines modern flight technology with impressive aerodynamics and is aimed at both advanced and ambitious beginners in the world of 3D art flight. In this detailed article you will learn everything you need to know about this extraordinary double-decker.

Technical specifications at a glance

The E-flite double-decker convinces with its sophisticated technical equipment specially designed for dynamic art flight:

These technical features make the Flat Foamy double decker a powerful yet easy to control model that is suitable for both leisurely cruises and aggressive 3D maneuvers.

This offers the delivery

In the BNF Basic package of the 4-Site 3D FF the buyer receives:

• Fully factory-mounted fuselage with pre-installed components
• Pre-installed spectrum Brushless Outrunner Motor
• Pre-installed 30-Amp spectrum Avian Smart Lite ESC
• Three pre-installed spectrum Sub-Micro Digital Servos with metal transmission
• AR630+ receiver with AS3X+ and SAFE Select
• Extensive product instructions

In addition, it is necessary to complete:

• A compatible 4-5+ channel spectrum DSMX/DSM2 transmitter
• 3S 11.1V LiPo battery with 850-1000mAh capacity and IC2 connection
• Suitable LiPo charger with matching IC2 adapter

Target group and areas of application

The E-flite 4-Site 3D FF is ideal for several pilot types:

Advanced art flight enthusiasts: The excellent flight characteristics and the possibility of extreme 3D art flight make this model an ideal companion for pilots who already have experience with agile aircraft and want to expand their skills.

Changers of single-deckers: Pilots who have already flew the popular Eratix 3D FF and want to switch to a double decker will find a perfect successor in the 4-site with familiar features, but new flying possibilities.

Ambient starters with SAFE support: Thanks to the optional SAFE Select technology, even less experienced pilots can safely fly this model and gradually enter the dynamic art flight.

Assembly and commissioning

A particular advantage of this double-decker is the minimum assembly effort. Unlike many other Flat Foamy models in this class, the 4-Site 3D FF does not require a complicated construction phase:

• The cell is already completely factory-mounted
• All electronic components are pre-installed
• No adhesives or adhesive tapes required
• Fast assembly by plug and screw connections

The assembly time is exceptionally short with about 15-20 minutes. The accompanying guide is precise and well illustrated, which simplifies assembly even for less technically experienced pilots.

Flight characteristics and performance

The double-decker of E-flite impresses with its versatile flight characteristics:

Art skills: The model was specially designed for dynamic 3D art flight and dominates all classic and extreme maneuvers with flying colors. From precise roles, sharp knife flights to impressive Torque-Rolls and Harriers - the 4-Site masters everything with impressive agility.

Stability: Despite its ability to fly, the model also offers remarkable stability in normal flights, especially when AS3X+ technology is active. This automatically damps wind blows and unwanted movements.

Slow flight capabilities: Thanks to its aerodynamic design as a double-decker, the aircraft can be flown extremely slowly and controlled - a property that is particularly advantageous in restricted airfields.

The climbing power is impressive with the drive installed at the factory. Almost vertical climbing flights are easily possible, which offers the pilot numerous possibilities for spectacular maneuvers.

Innovative technologies: AS3X+ and SAFE Select

The E-flite 4-Site 3D FF double decker benefits from two advanced technologies that significantly improve the flight experience:

AS3X+ (Artificial Stabilization - 3-Axis): This technology works in the background and automatically corrects unwanted movements by wind or turbulence. The result is a much more precise flight behavior that feels like flying a significantly larger and heavier model.

SAFE Select: This optional switchable function offers:

• Automatic self-stabilization
• Angle and speed limitation
• Panic mode to restore a stable flight situation

SAFE Select can be switched on and off during the flight. This allows pilots to receive support in critical situations, but have the possibility to switch to the unlimited manual flight at any time.

Telemetry functions of the Avian Smart Lite ESC

A technical highlight of the model is the pre-installed 30-amp spectrum Avian Smart Lite ESC (Electronic Speed Controller). This offers extensive telemetry functions:

• Real-time monitoring of engine speed (RPM)
• Current intensity measurement
• Battery voltage indicator
• Further operating parameters

These data are captured both when using smart batteries and conventional LiPo batteries and can be displayed via compatible receivers (such as the AR630+ included) on spectrum AirWare transmitters. This feature allows pilots to optimally use their flight time and identify potential problems at an early stage.

Material quality and robustness

The 4-Site 3D FF is made of lightweight but extremely robust EPP (Expanded Polypropylene). This material offers several advantages:

• Excellent crash resistance
• Low weight for dynamic flight properties
• Easy repair options for damage
• Longevity even with intensive use

The design as "Flat Foamy" combines minimal weight with surprising stability. The connecting elements between the components are carefully designed and provide sufficient strength for all flight maneuvers, even in extreme 3D art flight loads.

Transport and storage

The compact size of the 800mm E-flite double-decker makes it an ideal model for pilots who often need to transport their aircraft:

• Fits fully assembled in most medium-sized cars
• Optionally, the support surfaces can be easily removed
• Low weight facilitates transportation
• Robust material minimizes transport damage

A dry, temperature-stable place is recommended for storage. Thanks to the materials used, the 4-site is less susceptible to deformations due to moisture or temperature change than many other models of its class.

Spare parts supply and support

E-flite belongs to the Horizon Hobby Group, one of the leading RC modelling companies. This offers several advantages with regard to the spare part supply:

• Extensive network of traders worldwide
• Good availability of original spare parts
• Fast delivery times also for special components
• Long-term spare parts supply

The manufacturer also offers extensive support:

• Detailed online documentation
• Helpful video tutorials
• Competent customer service

Community and online presence

An active community has developed around the E-flite 4-Site 3D FF. In numerous forums and social media owners exchange experiences, tuning tips and flight videos. Particular emphasis should be given to:

• Specialized Facebook groups with thousands of members
• YouTube channels with detailed flight videos and tutorials
• RC forums with technical discussions and assistance

This community support is particularly valuable for newcomers who can benefit from the experience of other pilots. Regular meetings and events especially for 3D art flight models also provide an opportunity for personal exchange.

Compared to competitors

In the segment of the compact 3D art flight models there are some interesting alternatives to the Flat Foamy double-decker of E-flite:

The 4-Site 3D FF is particularly distinguished by the combination of double-decker design, advanced electronics and the optional SAFE support from these alternatives. While some competitive products may offer similar or even better performance in individual areas, the overall package of the E-flite model is hardly to be exceeded in its balance.

Value for money

The BNF Basic package of the E-flite aircraft is positioned in the middle to high price segment. This pricing is justified by several factors:

• High-quality pre-installed electronic components
• Innovative technologies such as AS3X+ and SAFE Select
• Excellent flight characteristics
• Durable, robust material
• Minimum assembly effort

Compared to the self-construction of a comparable model in which all components would have to be bought individually, the BNF Basic package offers an excellent value for money. The saved time and the avoidable effort in component selection and installation justify the price impact compared to simpler models.

Tips, tricks and optimizations

Experienced pilots have discovered numerous ways to further improve the flight experience with the E-flite double-decker:

Battery optimisation:

• The use of 3S 1000mAh LiPos with high C rate (min. 30C) improves performance at 3D maneuvers
• Precise focus adjustment by moving the battery in the battery compartment
• The use of spectrum smart batteries maximizes telemetry functions

Control optimization:

• Increase the outputs for even more extreme 3D maneuvers
• Adapting Expo settings for more precise control
• Dual rates for different flight styles (Normal/3D)

Mechanical improvements:

• Light reinforcements at critical connecting points for even higher loadability
• Optimization of rudder deflections for play-free movement
• Additional securing of the motor mount with intensive 3D insert

Tuning options:

• Propeller variants for different flight styles (more pitch for vertical performance, less for longer flight time)
• Optional lighting systems for dusk flights
• Individual colour design with light, airworthy colours

Frequent questions and solutions

Below you can find answers to the most frequently asked questions about E-flite 4-Site 3D FF:

Question: How long does the battery last in normal flight?
Answer: With a 3S 1000mAh LiPo battery, about 6-8 minutes are realistic with mixed flight style. With extreme 3D art flight, the time is reduced to about 4-6 minutes.

Question: Is the brushless motor sufficiently strong for vertical maneuver?
Answer: Yes, the factory-installed engine delivers enough power for vertical climbing flights and sophisticated 3D maneuvers, especially with the recommended 3S battery.

Question: Is the double-decker suitable for beginners?
Answer: Thanks to SAFE Select technology, even less experienced pilots can fly the model, but basic experience with RC aircraft should be available. Absolute beginners should start with a special starter model.

Question: How to repair minor damage?
Answer: The EPP material can be repaired with second glue and activator. In the case of structural fractures, light glass fiber band can additionally be used for reinforcement.

Question: Can I use a larger battery?
Answer: Batteries with a higher capacity than 1000mAh are possible, but the higher weight reduces the 3D performance. The focus must be checked when using other batteries.

Question: How is SAFE Select activated or disabled?
Answer: The SAFE Select function can be activated or deactivated during the binding of the receiver. In the flight it can then be controlled via an assigned switch on the transmitter.

Question: Which stations are compatible?
Answer: All spectrum DSMX/DSM2-compatible transmitters with at least 4 channels function. A transmitter with spectrum AirWare is recommended for full telemetry (e.g. DX6e or higher).

Conclusion: A convincing art flight double-decker

The E-flite 4-Site 3D FF (Flat Foamy) 800mm BNF Basic with AS3X+ and SAFE Select convinces as a thought-out overall package for demanding RC pilots. It combines impressive flight performances with modern technology and easy handling.

The strengths of the model are particularly in its versatility: This double-decker offers a wide range of applications from cozy round flights to extreme 3D art flight. The factory-preinstalled electronics, the minimum assembly time and the innovative SAFE technology make it an excellent choice for pilots looking for an uncomplicated entry into the world of double-decker art flight.

While the purchase price is slightly higher compared to simpler models, the required quality and the saved installation effort justify this investment. With the Flat Foamy double-decker from E-flite, the pilot receives a well-thought, powerful and long-lasting model aircraft that knows how to inspire both the ground and the air.