Why do performance plans commonly land with a battery reserve rather than using the full advertised capacity?

• A.Real conditions, sag, aging, and unexpected winds can consume energy faster than planned
• B.Reserves are only needed for manned aircraft
• C.Using the reserve damages the battery instantly

Why

Published capacity assumes ideal conditions that real flights rarely match. A reserve absorbs headwinds, detours, and faster-than-expected drain so the aircraft can still land under control.

Source: FAA-G-8082-22 Ch. 8 · ACS knowledge area: Determining the Performance of an sUAS · From the Loading, Performance & Airport Operations practice bank (PER-053).

Practice this category as a full test

More Reserve for unexpected performance loss questions

• What happens to a multirotor sUAS as its total takeoff weight increases?
• Adding a heavier payload to an sUAS will most directly cause which effect?
• Why must the center of gravity (CG) remain within the limits set by the manufacturer?
• Before takeoff, how should a payload or attached equipment be secured?
• Under Part 107, what is the maximum allowable takeoff weight for an sUAS, including everything attached?