BELL-204 ACE Scale RC Helicopter - Remote SAR

No. If GPS signal is lost, the helicopter normally loses horizontal position hold, so it will not hover in place like it does in GPS mode, but it should still maintain basic attitude and altitude control.

Control will become more demanding and the helicopter may drift. Keep it within visual line of sight, avoid trees, buildings and people, and land in a safe open area.

ATT mode does not rely on GPS positioning. It uses sensors such as the gyroscope, accelerometer and barometer to help maintain attitude and altitude, so it can start without GPS.

However, indoor spaces are confined and full of obstacles, and the helicopter will not hold position like it does in GPS mode. Indoor flying is not recommended unless the pilot is experienced and has a safe, controlled area.

Yes. A single-rotor helicopter may hover with a slight tilt because of main rotor torque and the side force generated by the tail rotor.

If the helicopter holds a stable hover without severe vibration or uncontrolled drift, a small tilt is usually normal and does not require adjustment.

This is often caused by ground resonance or poor grip on a hard, smooth surface such as wood flooring, concrete or stone.

• Take off from grass, soil or a non-slip mat where possible.
• Check that the main blade screws are tightened correctly.
• If shaking continues or becomes worse, stop flying and inspect the blades, blade grips, spindle shaft and landing gear.

A flashing red/yellow light usually means the controller has not met the conditions for arming or starting. Common causes include low battery voltage, not being armed yet, or a compass/GPS warning.

• Confirm the flight battery is fully charged, preferably above 75%.
• Arm the helicopter first, then move the start switch only after the normal ready indication appears.
• Connect the ACE software and check voltage, GPS and compass status messages.

A thorough pre-flight inspection is crucial for safety. Please watch our detailed guide on how to inspect your helicopter to ensure everything is in perfect working order.

Yes, proper blade installation is critical. You can find a step-by-step tutorial here: Rotor Blade Installation Tutorial.

Shaking can be caused by a few factors. Our comprehensive video, Solutions for Helicopter Shaking, addresses common causes and solutions applicable to all models.

We understand your concern. While it feels like a product issue, these incidents are almost always due to operational errors that can happen to any pilot. For example, accidentally switching to "3D Mode" or having a sleeve catch the "STOP" switch can cause a crash. We find that the most common cause is the "Return-To-Home" feature activating due to a low battery. Please review this video on the low battery feature. If parts were damaged, they are available for purchase in our store.

The end user assumes full responsibility and all risks associated with the use of radio-controlled flight products. Flywing accepts no responsibility for injury, death, or damage arising from the use of any products purchased from us.

Customers are solely responsible for the safe use, charging, handling, storage, and disposal of Lithium Polymer (LiPo) and other batteries. We disclaim all liability for any damages or injuries related to battery use.

In-flight wobble or shaking is usually related to blade tightness, mechanical friction or parameter settings. Blades that are too tight are a common cause.

Check that the main blades can move smoothly, then inspect the blade grips, spindle shaft, linkages and servos. If the mechanics are normal, check the flight controller settings according to the manual.

Tall buildings can block or reflect GNSS/GPS signals, reducing positioning accuracy. This may cause drift, unstable position hold or an inaccurate return point.

Fly in an open area away from buildings, trees, power lines and large metal structures.

After powering on and before takeoff, carry the helicopter slowly around the flying area and watch the ACE controller light and software status.

If the light cannot stay in the normal green state, or the software reports a compass warning, move to a more open location away from metal objects and electromagnetic interference, then recalibrate according to the manual.

In the transmitter mode-channel settings, change the relevant mode value from 1000 to 1300. The lowest position of the mode switch can then be used as manual 3D mode.

3D mode requires advanced flying skill. Before enabling it, confirm that pitch, throttle, arming and stop switch settings are correct, and test only in an open area.

Common mode values are:

• ACE Scale: HOME 2000, GPS 1500, ATT 1000.
• ACE FW450L: GPS 2000, ATT 1500, Smart Acro 1000, 3D Acro 1300.

Values may vary by model or firmware version, so always confirm with the relevant manual and the ACE software display.

Connect the ACE software and check whether the mode switch channel matches the mode shown in the software. When you move the transmitter switch, the corresponding mode in the software should change at the same time.

If it does not match, check the transmitter channel assignment, endpoint values, mixes and receiver output mode.

Usually no. The important point is not to move the helicopter while the controller is performing self-check, such as during alternating red/blue flashing.

After self-check is complete, the canopy or blades may be installed following safe procedures. Before installing blades, make sure the motor cannot start unexpectedly and the stop switch is in the safe position.

Wobbling or circling in hover may be related to compass calibration, mechanical friction or rotor head components.

• Recalibrate the compass in an open area first.
• Check whether swashplate linkages and ball joints are binding.
• Inspect blade grip bearings, the spindle shaft and servos for smooth movement.

If the problem continues, stop flying and complete a mechanical inspection before testing again.

If blade tightness is correct, check swashplate gain, the spindle shaft, dampers and overall mechanical vibration.

You may reduce swashplate gain slightly, then confirm that the rotor head, blade grips, linkages and servos are not worn, bent or binding.

If the pitch stick is released or allowed to spring back during motor stop, the helicopter may briefly climb before descending.

Follow the stop procedure in the manual and keep steady control of the pitch stick while the motor is stopping.

If the tail rotor touches the ground or stops working during takeoff, the helicopter may spin suddenly. A common cause is pulling back on the stick during lift-off, causing the tail to dip and the tail rotor to strike the ground.

Keep the helicopter level during takeoff, avoid pulling back, and use a flat, open takeoff area.

Some drift is normal. GPS mode uses satellite positioning to hold position, while ATT mode does not provide horizontal position lock. The helicopter can drift due to inertia, wind and its own attitude.

After switching to ATT mode, be ready to manually correct position and practice in an open area.

During high-speed forward flight, aerodynamic drag from the fuselage and body shell can push the nose down. Repeated correction may create an up-and-down oscillation sometimes called porpoising.

Reducing forward speed usually reduces or removes the behavior. Avoid extended high-speed flight at maximum pitch angle in ATT mode.

If the scale helicopter continuously drifts left in ATT mode, connect the H-ACE software, open the main rotor settings, and slightly increase the left servo parameter, for example by 10 to 20.

Make only small changes at a time and perform short test flights in an open area.

After power-on, the helicopter starts searching for satellites regardless of the selected mode. If GPS positioning is completed in the air, you can switch to GPS mode; if positioning has not completed, GPS position flight will not work correctly.

It is recommended to wait for GPS lock on the ground before takeoff so return-to-home can record a more reliable takeoff point.

First move away from magnets, signal towers, cables, large metal objects and other sources of electromagnetic interference, then power on again in an open outdoor area.

• Connect the PC software and check for warnings.
• Check the GPS Star and GPS HDOP values.
• Wait 5 to 10 minutes for GPS search to complete.
• If GPS HDOP is higher than 1.0, signal quality is usually poor. Test in another location.