Under the definition in 14 CFR § 107.3, what makes an unmanned aircraft a "small unmanned aircraft"?

Why: 14 CFR § 107.3 defines a small unmanned aircraft as one "weighing less than 55 pounds on takeoff, including everything that is on board or otherwise attached to the aircraft." The limit is measured at takeoff and includes all attached equipment.

• Assumes the battery and payload don't count toward the 55-pound limit, but the definition explicitly includes "everything that is on board or otherwise attached to the aircraft."
• Applies the weight limit to in-flight weight after fuel or battery burn-off, but the regulation fixes the measurement point at takeoff, not at some later point in the flight.