posted on Jul, 7 2019 @ 06:04 PM
Well, my observation would be you don't have enough 'fan' for your load, unless you go to a (mini) turbine. You don't have the rpms with an electric
motor to overcome the changes in airflow. Especially with a flat-body lifting design. 1-2 times the thrust to weight is good for prop planes, but
lifting bodies are going to take 10-12 times the weight in thrust.
I assume when you are talking about "flat bottom", you are referring to a 'lifting body", correct?
BTW...they're not really "flat" (not as far as the airstream goes.)
ETA - A Hi-bypass fan works on a different principle. The turbine creates a lot of momentum which the fan eats up to bypass the turbojet and provide
forward thrust. Ever heard that low 'groaning' noise when one of the Rolls Royce engines start up on an Airbus?? That's the transition between the
jet and the fan taking over. That kind of power is reserved for some turbine type engines.
edit on 7/7/2019 by Flyingclaydisk because: (no