as Guppy asks where's the forward component of thrust?
No. The rearward vector of the thrust provided by the fan will provide forward propulsion. If you intend to provide enough thrust to cause adequate airflow over the entire airfoil to develop lift, you're going to be providing enough thrust to drive the entire vehicle forward, too; it's not a vertical operation, but a forward operation while developing lift.
Sorry the freebody diagram is burnt into my mind and the thrust arrow points forward...I think we mean the same thing...sorry If I've misquoted you...
I think that the problem that we see with
PBL's proposition is there can be no downwash w/o forward movement...how otherwise, does the air get pushed down to push the plane up?...I'm still not seeing any possible contrivance that could do such a thing how does sufficient air get deflected downward to lift the airplane without forward movement..the airplane can not simply rise vertically w/o forward movement
