During assembly, a technician installs a multirotor sUAS's flight battery slightly off-center to one side rather than in the manufacturer-specified centered position. What is the most likely operational effect once airborne?
- AThe aircraft will pitch nose-down uncontrollably during forward flight
- BThe aircraft will tend to roll or drift toward the heavier side, requiring continuous control input or trim correction to maintain level flight
- CThe imbalance will only affect vertical climb rate, not lateral stability
- DAll motors will automatically increase RPM equally to compensate, with no noticeable flight effect
Show answer & explanationAnswer & explanation
Correct answer: B. The aircraft will tend to roll or drift toward the heavier side, requiring continuous control input or trim correction to maintain level flight
An off-center (lateral) center of gravity causes the aircraft to be heavier on one side, producing a persistent rolling tendency toward that side. The flight controller may partially compensate by adjusting individual motor outputs, but the pilot will often notice reduced control authority or the need for trim correction to keep the aircraft level.
Why the other options are wrong
- A. A lateral offset does not primarily cause nose-down pitch; that would result from a fore-aft CG shift.
- C. Lateral CG imbalance directly affects roll/lateral stability, not just climb rate.
- D. Flight controllers can only compensate to a limited degree; a persistent imbalance still affects handling.
Lateral CG Imbalance
An off-center left-right weight distribution on a multirotor causes a persistent rolling tendency toward the heavier side, requiring compensation to maintain level flight.
- CG should be centered per manufacturer specifications for balanced flight
- Lateral imbalance causes roll drift toward heavier side
- Flight controllers can partially but not fully compensate for CG offsets
Memory trick: A lopsided load makes the drone lean like a boat taking on water on one side.