There is an airplane analogy about using dual fans. A few airplanes have
one fan behind another. One "modern" one is the Cessna 337, commonly known
as the Mixmaster. One fan on the front and one fan on the back. These
airplanes are less efficient than when the engines are side by side.
Additionally, the rear engine can have cooling problems. The main advantage
of such an arrangement is what is known as "center line thrust". When one
engine quits on takeoff, there is no rotational thrust that wants to spin
the aircraft (bad at low altitude). Quick response to feather the dead
engine is not required. The only penalty is less rate of climb.
Although the fans are not as proportionally close as stacked fans, it does
prove that they can work. Since the flow is modified, pay attention to the
cooling of the second fan - although muffin fans consume so little power it
should not be a problem.
73, Colin K7FM
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