How to Set Up Throw to Fly Mode

一、原理

Throw Mode is suitable for fixed-wing aircraft, allowing pilots to hand-toss launch without a runway or catapult. When the flight controller detects that acceleration reaches the set value, it automatically starts the motors, climbs to a safe altitude according to set parameters, and then enters normal flight mode.
This mode mainly relies on accelerometers for toss detection, and ensures safe takeoff through parameters such as throttle, pitch angle, and target altitude.

二、设备准备

1) Flight Controller: Any of the SpeedyBee F405 WING APP / SpeedyBee F405 WING MINI / CoreWing F405 WING V2 flight controllers are applicable to this tutorial.
2) Assembled Aircraft: Includes RC transmitter, receiver, GPS, compass, VTX (video transmitter), and FPV equipment (goggles).
3) Ground Control Station (GCS): Mission Planner.

三、具体操作

Step 1: Throw Mode Parameter Setup
✅ Enter Mission Planner → "Full Parameter List", search for the following parameters and modify them:

Parameter Name	Recommended Value	Description
TKOFF_ALT	100	Target altitude for takeoff mode (Unit: meters)
TKOFF_DIST	400	Maximum climb range for takeoff mode (Unit: meters)
TKOFF_LVL_PITCH	30	Maximum climb angle for takeoff (Unit: degrees)
TKOFF_THR_MAX	100	Maximum throttle (Unit: %)
TKOFF_THR_MINACC	3	Flight controller starts motors when instantaneous acceleration reaches 3m/s
📌 Parameter Adjustment Suggestions:

• TKOFF_ALT Can be adjusted based on flight environment, generally 50~150m.
• TKOFF_THR_MINACC represents the minimum acceleration to trigger Throw Mode. Beginners are advised to set 3~4m/s to prevent accidental triggering.
• TKOFF_THR_MAX sets the maximum throttle, ensuring the aircraft climbs smoothly. It is usually set to 100%.
  
  ✅ After saving parameters, restart the flight controller to apply the settings.

Step 2: Throw Mode Operation Sequence

Important

Note: Launch into the wind when using Throw Mode!!!

1. Complete flight controller self-check, unlock to check if motors are running normally, then lock the flight controller.
2. Select the flight mode to be used after the throw, and move the stick to this mode.
3. Switch to Throw Mode and unlock the flight controller.
4. Throttle up to 70% (can be adjusted based on aircraft performance, at least ensure minimum cruise throttle +10%).
5. Observe motor and control surface status:

• If motors are not spinning but control surfaces are deflected, it indicates Throw Mode is activated, just wait for the toss.
  6. Hold the aircraft and toss it forward, giving it sufficient acceleration for the motors to start spinning.
  7. Toss forward, and the aircraft will climb.
  8. After reaching a safe altitude, you can turn off Throw Mode and take control of the aircraft.

四、Q&A

Q: Why didn't the motors start after the aircraft was thrown?
A:
✅ Possible Causes:

• TKOFF_THR_MINACC is set too high, resulting in insufficient acceleration to trigger Throw Mode.
• Flight controller did not correctly enter Throw Mode, check if the RC switch is set correctly.
  Q: How to ensure no stall during takeoff?
  A:
  ✅ Possible Causes:
• TKOFF_THR_MAX is set too low, resulting in insufficient climbing power.
• TKOFF_LVL_PITCH is too high, causing the aircraft to climb too steeply and stall.
  ✅ Solutions:
• Increase TKOFF_THR_MAX (e.g., 80~100%) to ensure sufficient power for climbing.
• TKOFF_LVL_PITCH is recommended at 20~30° to avoid a too-steep climb that causes a stall.

Technical Support QR Code