I got a hunch this morning, now that I am home I have tried it out and I was right.
Both designs become far more balanced when the tonnages are swapped.
NapFly
Type: NapFly VTOL Hi-Scout Drone
Chassis Type: VTOL (Small)
Technology Base: Inner Sphere (Advanced)
Mass: 3,000 kg
Battle Value: 16
Equipment Mass (kg)
Chassis/Controls 325.0
Engine/Trans. 1038.0
Cruise MP:13
Flank MP:20
Heat Sinks 0 0.0
Fuel 246.0
Armor Factor (BAR 2) 7 91.0
Internal Armor
Structure Value
Front 1 2
R/L Side 1/1 1/1
Rear 1 1
Rotor 1 2
Weapons
and Ammo Location Tonnage
None
Cargo
None
Notes:
Features Ultra-Light Chassis and Controls Modification
Drone Operating System(800 kg)
Recon Camera(500 kg)
Power Plant: Fuel Cell
Introduction Year: 3025
Tech Rating: D
Cost: 37,330 C-bills
PathCheck
Type: PathCheck Wheeled Hi-Scout Drone
Chassis Type: Wheeled (Small)
Technology Base: Inner Sphere (Advanced)
Mass: 2,000 kg
Battle Value: 12
Equipment Mass (kg)
Chassis/Controls 205.0
Engine/Trans. 340.0
Cruise MP:8
Flank MP:12
Heat Sinks 0 0.0
Fuel 131.0
Armor Factor (BAR 2) 8 104.0
Internal Armor
Structure Value
Front 1 2
R/L Side 1/1 2/2
Rear 1 2
Weapons
and Ammo Location Tonnage
None
Cargo
None
Notes:
Features Ultra-Light, Off-Road Chassis and Controls Modifications
Drone Operating System(700 kg)
Recon Camera(500 kg)
Manipulator(2; 10 kg each)
Power Plant: Fuel Cell
Introduction Year: 3025
Tech Rating: D
Cost: 41,912 C-bills