RPC sUAS Loading and Performance 2 — Questions and Answers
Question 1: A remote pilot adds a 0.5 lb camera payload to a sUAS originally configured for 0.3 lb. What is the most likely effect on flight performance?
- Increased maximum altitude ceiling
- Reduced flight endurance and slower climb rate (Correct answer)
- Improved stability due to lower center of gravity
- No measurable effect if payload is under 1 lb
Correct answer: Reduced flight endurance and slower climb rate
Adding payload increases total weight, which demands more power from motors, reducing battery endurance and climb performance.
Question 2: Which condition would most significantly degrade sUAS hovering efficiency?
- Flying over a paved surface
- Operating at high density altitude with maximum payload (Correct answer)
- Using propellers rated for the manufacturer's recommended RPM
- Flying in calm wind conditions at sea level
Correct answer: Operating at high density altitude with maximum payload
High density altitude means thinner air, requiring rotors to spin faster to generate the same lift, increasing power consumption and reducing hover efficiency.
Question 3: An sUAS manufacturer specifies a maximum gross weight of 3.5 lbs. The airframe weighs 2.8 lbs with a fully charged battery. What is the maximum allowable payload?
- 0.3 lbs
- 0.5 lbs
- 0.7 lbs (Correct answer)
- 1.0 lbs
Correct answer: 0.7 lbs
Maximum allowable payload = maximum gross weight minus airframe weight: 3.5 - 2.8 = 0.7 lbs.
Question 4: How does an off-center payload mounted to the front of a multirotor affect its flight characteristics?
- The aircraft will tend to pitch nose-down and require corrective trim (Correct answer)
- The aircraft will gain speed due to forward weight shift
- Flight time will increase because forward CG improves aerodynamics
- There is no effect as flight controllers automatically compensate without limits
Correct answer: The aircraft will tend to pitch nose-down and require corrective trim
A forward-shifted center of gravity causes a nose-down pitch tendency, which the flight controller must constantly counteract, wasting power and reducing control authority.
Question 5: In hot and humid summer conditions, a remote pilot should expect which performance change compared to standard conditions?
- Increased lift due to denser moist air
- Reduced lift because high temperature and humidity lower effective air density (Correct answer)
- No change since multirotor lift is independent of air density
- Improved endurance due to reduced motor cooling requirements
Correct answer: Reduced lift because high temperature and humidity lower effective air density
High temperature and humidity reduce air density (increasing density altitude), which decreases rotor efficiency and requires more power to maintain lift.
Question 6: A remote pilot notices the sUAS is consuming battery power faster than normal during a standard hover. What is the most likely cause?
- Wind is calm, reducing aerodynamic drag
- The payload weight exceeds the planned configuration (Correct answer)
- The GPS signal is stronger than usual
- The gimbal is locked in a downward position
Correct answer: The payload weight exceeds the planned configuration
Excess payload weight forces motors to work harder during hover, drawing more current and depleting the battery faster than anticipated.
Question 7: Which factor does NOT directly affect sUAS performance calculations for loading?
- Ambient temperature at the operating site
- Total weight of the aircraft including payload
- The color of the aircraft fuselage (Correct answer)
- Density altitude at the operating location
Correct answer: The color of the aircraft fuselage
Fuselage color has no measurable effect on loading or performance calculations; temperature, total weight, and density altitude all directly influence available power and lift.
RPC sUAS Loading and Performance 2
A remote pilot adds a 0.5 lb camera payload to a sUAS originally configured for 0.3 lb.
What is the most likely effect on flight performance?