Environmental Conditions 

To ensure flight safety, advisories for certain environmental conditions need to be followed.

Check the weather forecast (e.g., on weather app) for wind, rain, and temperature. Gather information about the condition of the site, e.g., intensity of radiation fields and altitude above mean sea level.  IF the weather seems to be bad it is always advised to cancel or postpone the flight mission .In case that environmental conditions become unsafe during the flight, press Return To Home (RTH) immediately to ensure that the drone lands safely.

 

Wind

Sustained winds must not exceed the 30 km/h (8 m/s, 16 kts). Check with the anemometer before flying and do not fly if the wind measurement on the ground exceeds 8 m/s in open fields (in confined spaces you have to rely on forecasts only). As a rule of thumb, wind speeds of 8m/s at ground level in open fields correspond to wind speeds of ~10m/s at 10m-20m height (forecast height) and ~12m/s in 100m height. Always  return to home (RTH), if wind speeds exceed 12m/s during flight.  The fail-safe option in all Johnnette drones can be customized according to the user requirements.

 

Precipitation/Fog

Do not fly in case of rain, snow, or fog.

Always check the weather forecast. If any precipitation appears during the flight, press Return To Home (RTH) immediately to ensure that the drone lands safely. Precipitation is dangerous because water drops can clog the airspeed sensor (pitot tube), which gives incorrect readings that may cause a crash.

Temperature

Ambient temperature must lie between -10 and 40 degrees Celsius (14 and 104 Fahrenheit). Therefore it is  advised to fly only if the batteries temperature is between 10 to 40 degrees Celsius (50 and 104 Fahrenheit). In very hot or cold temperatures, we recommend keeping the drone and pilot box in the shade or in a car before and between flights.

High-intensity radiation areas

Do not fly in areas that have high-intensity radiation, such as transmission towers. In case that high radiation is present, the telemetry connection will be lost. If you are aware that the telemetry will be lost and you are sure the flight is safe, you can manually adjust the timeout before Return To Home (RTH)  is automatically triggered. Also you can turn of the telemetry  fail-safe option and manually land the drone after completing the mission.

  

High altitude

Do not fly at an altitude of more than 3000m above mean sea level with the default propellers. The battery consumption at high altitude is higher and therefore safe landings can not be guaranteed. Taking off from altitude higher than 2500m is possible with the high altitude propellers. High-altitude propellers are optimized for the thin air of high altitudes (2000 to 5000 m).