1. Introduction
The E-flite 4-Site 3D FF (Flat Foamy) 800mm is a remote-controlled biplane designed for aggressive aerobatic maneuvers, smooth sport flying, and slow-flying performance. This model is ideal for experienced pilots familiar with flat foam models, intermediate pilots interested in advanced flying without complex builds, and less experienced pilots seeking an accessible entry into 3D flight. Its lightweight yet durable EPP airframe is largely factory-assembled, allowing for quick preparation for flight.
2. What's in the Box
- (1) E-flite 4-Site 3D FF 800mm aircraft
- (1) Spektrum 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)
- Product Manual
3. Key Features
- Capable of slow cruising, sport flying, basic, and all-out 3D aerobatics.
- Factory-installed brushless motor, compatible with 3S 850–1000mAh batteries.
- 30-amp Spektrum Avian Smart Lite ESC for real-time battery voltage, current, RPM, and other data.
- Spektrum AR630+ receiver with fly-by range telemetry and DSMX technology.
- Optional-use SAFE Select flight envelope protection for easier flight.
4. Safety Information
WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can result in damage to the product, personal property, and cause serious injury. This is a sophisticated hobby product. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this Product in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children without direct adult supervision. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC. The product manual contains instructions for safety, operation, and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup, or use, in order to operate correctly and avoid damage or serious injury.
5. Setup
The E-flite 4-Site 3D FF is designed for quick and easy assembly, primarily using bolts and snaps. No glue, tape, or extensive hours are typically required.
5.1 Required Items (Not Included)
- Compatible Full-Range 4+ Channel DSMX/DSM2 Aircraft Transmitter
- 3S 850–1000mAh LiPo Flight Battery
- Compatible LiPo Charger
Ensure all required items are acquired before proceeding with assembly.
Figure 1: Visual representation of additional components required for flight: battery, charger, and transmitter.
5.2 Assembly Steps
- Attach Wings: Securely attach the upper and lower wings to the fuselage using the provided hardware. Ensure all connections are firm.
- Install Landing Gear: Attach the landing gear components. While the model can be hand-launched, the landing gear provides convenience for ground takeoffs and landings.
- Connect Battery: Connect your fully charged 3S 850–1000mAh LiPo flight battery to the ESC. Ensure the battery is secured within the battery compartment to maintain proper center of gravity.
- Bind Transmitter: Follow your Spektrum transmitter's instructions to bind it with the installed AR630+ receiver. This process establishes communication between your transmitter and the aircraft.
- Control Surface Check: After binding, perform a thorough check of all control surfaces (ailerons, elevator, rudder) to ensure they respond correctly and move in the appropriate direction relative to your stick inputs.
6. Operating Instructions
Before each flight, ensure all components are securely attached, the battery is fully charged, and control surfaces respond correctly. Always fly in an open area free from obstacles, people, and animals.
6.1 Pre-Flight Checks
- Verify battery charge level on both the aircraft and transmitter.
- Confirm proper binding between transmitter and receiver.
- Check all control surfaces for free movement and correct response to stick inputs.
- Ensure propeller is securely attached and free from damage.
- Perform a range check according to your transmitter's manual.
6.2 Takeoff
For ground takeoffs, place the aircraft on a smooth surface, align it into the wind, and gradually increase throttle. Apply slight up-elevator as speed increases to lift off. For hand launches, hold the aircraft firmly, apply full throttle, and gently toss it forward into the wind.
6.3 Flight Controls
The aircraft is controlled using standard RC airplane controls:
- Throttle: Controls motor speed and altitude.
- Ailerons: Control roll (banking left/right).
- Elevator: Controls pitch (nose up/down).
- Rudder: Controls yaw (nose left/right).
6.4 Landing
Approach the landing area into the wind. Gradually reduce throttle and maintain a controlled descent using the elevator. Aim for a gentle touchdown on the landing gear. For soft landings, reduce throttle to idle just before contact.
7. Flight Modes (AS3X and SAFE Select)
The E-flite 4-Site 3D FF is equipped with a Spektrum AR630+ receiver featuring AS3X and optional-use SAFE Select technologies.
- AS3X (Artificial Stabilization - 3-aXis): This technology works behind the scenes to smooth out the effects of wind and turbulence, making the aircraft feel like it's flying on rails. It provides a more locked-in feel, enhancing precision and stability without interfering with your control inputs.
- SAFE Select: This optional technology offers flight envelope protection, making it easier to fly. When activated, SAFE Select provides:
- Pitch and Bank Angle Limits: Prevents the aircraft from entering extreme attitudes.
- Automatic Self-Leveling: Returns the aircraft to a level attitude when the control sticks are released.
8. Maintenance
Regular maintenance ensures optimal performance and longevity of your aircraft.
- Inspection: Before and after each flight, inspect the airframe, control surfaces, propeller, and landing gear for any damage, cracks, or loose connections.
- Cleaning: Clean the aircraft with a soft, dry cloth. Avoid using harsh chemicals that could damage the foam material.
- Battery Care: Store LiPo batteries in a cool, dry place at storage voltage. Never overcharge or over-discharge batteries.
- Propeller Replacement: Replace damaged or unbalanced propellers immediately to prevent vibrations and potential motor damage.
- Storage: Store the aircraft in a safe place, away from direct sunlight and extreme temperatures. The original packaging or a dedicated carrying case is recommended for transport and storage.
9. Troubleshooting
This section addresses common issues you might encounter.
| Problem | Possible Cause | Solution |
|---|---|---|
| Aircraft does not respond to transmitter. | Not bound, low battery (aircraft/transmitter), receiver/ESC issue. | Ensure binding is complete. Check battery levels. Inspect connections. |
| Motor not spinning. | Throttle cut active, ESC not armed, motor/ESC damage. | Disable throttle cut. Ensure throttle is at zero before arming. Check for damage. |
| Aircraft flies erratically. | Control surfaces reversed, damaged propeller, incorrect center of gravity. | Verify control surface direction. Replace propeller. Adjust battery position. |
| Short flight times. | Battery not fully charged, old/damaged battery, aggressive flying. | Ensure full charge. Replace old batteries. Adjust flying style. |
10. Specifications
- Product Dimensions: 14.7 x 11.5 x 41 inches
- Item Weight: 6.78 pounds
- Item Model Number: EFL02950
- Manufacturer Recommended Age: 14 years and up
- Batteries: 1 Nonstandard Battery required (3S 850–1000mAh LiPo recommended)
- Manufacturer: E-flite
11. Warranty and Support
For warranty information, technical support, or replacement parts, please refer to the official E-flite or Horizon Hobby website. Contact details and service procedures can be found in the product manual or on their respective support pages.
12. Product Media
12.1 Images
