How can you determine the weight of a UAS for compliance with regulations?

To determine the weight of a UAS for compliance with regulations, weighing the UAS with all attached equipment and payload before flight is the most reliable method. This process ensures that you have an accurate measurement of the UAS in its operational configuration, including any additional equipment like cameras, sensors, batteries, or payloads that will be carried during flight.

This accurate weight measurement is crucial for regulatory compliance, as it affects the classification of the UAS and the pilot's responsibilities regarding operational limits, airspace restrictions, and necessary certifications. The weight can also influence the flight performance, including flight time and stability.

While estimating the weight based on similar models or checking manufacturer specifications provides some insight, these methods may not account for variations in equipment or payload that would affect the actual weight. Using a scale capable of reading small increments can be helpful, but it doesn't address the importance of weighing the entire setup as it will be used in flight. Hence, weighing the UAS with all attached equipment and payload provides the most accurate and relevant measurement for compliance purposes.