Meteorology for UAS Operations Flashcards
6 cards from real A2 COFC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Meteorology for UAS Operations flashcards as text
What is the maximum wind speed generally considered safe for most consumer drones weighing under 4 kg?
Answer: 40 km/h (25 mph)
Most consumer drones under 4 kg can safely operate in winds up to approximately 38-40 km/h (24-25 mph), though this varies by model. Pilots should check their drone's specifications and reduce this limit in gusty conditions, as gusts can significantly exceed sustained wind speed.
How do wind gusts affect drone flight safety compared to steady winds of the same average speed?
Answer: Gusts can cause sudden attitude changes, loss of control, and significantly higher power consumption
Wind gusts cause rapid, unpredictable changes in the forces acting on a drone, leading to sudden attitude changes, difficulty maintaining position, and spikes in power consumption as motors compensate. Gust factors should always be considered — a gust can be 1.5 to 2 times the sustained wind speed.
What weather phenomenon creates the greatest risk of sudden drone loss due to electrical failure?
Answer: Lightning and thunderstorms
Lightning poses an extreme risk to drones — a strike would destroy electronics instantly. Additionally, the strong and turbulent winds, heavy rain, and electrical interference associated with thunderstorms make them the most dangerous weather condition for drone operations. Never fly during or near thunderstorms.
Why is temperature an important consideration for drone operations in the UK?
Answer: Cold temperatures reduce LiPo battery performance and capacity, while heat can cause overheating of motors and electronics
Cold temperatures (below approximately 5°C) significantly reduce LiPo battery voltage and capacity, shortening flight times and potentially causing sudden voltage drops. Hot temperatures can cause motor and ESC overheating. UK winter conditions frequently require battery preconditioning.
What is the significance of the dew point for drone operations?
Answer: When air temperature approaches the dew point, fog or low cloud may form, reducing visibility below VLOS requirements
The dew point is the temperature at which air becomes saturated and moisture condenses. When air temperature is close to the dew point, fog, mist, or low cloud can form rapidly, potentially reducing visibility below that needed to maintain VLOS. Moisture can also affect drone electronics.
How does the Beaufort Scale help drone pilots assess wind conditions?
Answer: It provides a standardised scale relating wind speed to observable conditions on land or sea, helping pilots estimate wind strength without instruments
The Beaufort Scale (0-12) describes wind conditions using observable effects (e.g., leaves rustling = Force 3, small branches moving = Force 5). This helps drone pilots quickly estimate wind speed by observing their surroundings when anemometer readings are not available.