Imprecise Rescue

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What to do when Rescue/Stabilisation is imprecise?

Perform Bench testing first. If it is correct, you are ready to fly.

1 Bench testing

If rescue or stabilisation is not precise, do the following test:

  1. Put model at a table and engage the rescue/stabilisation.
  2. Swashplate should be perfectly level. If model has inclined skids, swashplate will be tilted backwards little bit to compensate this attitude.
  3. When model is taken from table and any of the mode is engaged, swashplate should compensate any inlinaction in attitude of the model/unit.
  4. Swashplate should counter-act to any movement so that model is forced back to the horizontal level.
  5. When model is tilted forward, swashplate should tilt backwards (with the most helicopters).
  6. When model is tilted left, swashplate should tilt right and vice versa.

2 Rescue/Stabilisation is imprecise during flight

In case that any of Rescue or Stabilisation modes are inconsistent, banking model to a side upon engaging or even pushing model down instead of ascending, there is serious problem either in the configuration or in the condition of the model. If the problem happened once it will happen sooner or later again, for this reason it is extremely important to find reason for this behavior.

2.1 Check list

  • Very important is to check, whether the Mounting Position and the Swashplate type parameters are configured correctly (General tab). If not, these modes can't operate properly, eventually they will work properly only for a limited time. Make sure that in the Diagnostic tab all directions correspond with a real stick movement of your radio.
  • Check if the unit is aligned in all 3 axes. Alignment error should be approx. in 1° range or less. You should mount the unit precisely in respect to the helicopter' frame. Use only one provided adhesive tape (1 layer). The unit should not flex or move in any way - mounting should be rock solid.
  • Rescue and Stabilisation can work in nearly any condition. But in case that your Vibrations are exceptionally high it can't be guaranteed. It can work only for limited time in that case. The longer and complex is flight, the higher chance for failure. Use Spectrum Analysis tool in the Spirit Settings software, especially Y - Aileron axis, where there are mostly the highest. Resonant vibrations are the most problematic and are audiable. Measure carefully with Tail Blades on if possible. Measuring vibration level by hand is irelevant, because hand can't sense a high frequencies.
  • Helicopter is equipped with a cooling fan that is producing ultrasound frequency. HobbyWing ESCs FAN are known for this. This has a great impact on the precision of Rescue and Stabilisation modes.
In case that the model is tilting to the same side during activation always, then the basic servo settings are likely not correct.
Please verify that the swashplate is perfectly leveled when Servos/Subtrim (tuning) is enabled. During setup it is necessary to use the Cyclic Leveler tool.

Info.png The easiest test for checking the rescue is to fly the helicopter in very normal way (your style). Then, immediatelly after the flight while rotor is not spinning anymore, you can activate the bailout/stabilisation. If you can see that swashplate is in the horizontal position and helicopter too, then it should work correctly anytime during the flight as well. This is very safe method for checking the operation.

3 Settings for the best performance

There are two parameters that can greatly improve reliability and precision of the Stabilisation and Rescue modes:

  • Stabi Correction
  • Extended Signal Processing

Both can be found in Advanced - Expert Settings.

Generally default settings should be suitable for the most models. With default settings both parameters are disabled. If you are in doubt, please use this settings.

If you are unable to achieve precise behavior with basic maneuvers, enable Extended Signal Processing. This mode is suitable for models that are producing high vibrations or a kind that is strongly interfering with sensors.

For advanced pilots that are performing complicated maneuvers parameter Stabi Correction can be helpful. Use this parameter only if default settings are not satisfying and model is in a good condition. Otherwise results can be worsened.