A dual ducted fan arrangement in which the duct components, engine, and
avionics/payload pods are capable of being quickly disassembled to fit
within common backpacking systems. Each duct is identical in fan, stator,
and control vane design. Assembly connections between ducted fans and
electronic modules are also identical. An engine or APU drives the dual
ducted fans through a splined shaft to a differential or through electric
motors. Energy is transferred to the ducted fans by a single gear mounted
to the stator hub. Relative speeds of the individual ducted fans are
controlled through separate frictional or generator load control braking
mechanisms on each of the splined shafts between the differential and
ducted fans. In the electric motor case relative speed is through
electronic speed control. The fans are counter rotating for torque
balancing. The electronic module locations are vertically variable for
longitudinal center of gravity for variations in payloads.