New idea in ducted fans

I've seen several threads on the idea and the consensus is alwasys that it would be more advantagous to apply more power to a single fan.  Noone seemed to want to take into the lab though.

Hi ,Blind vision,Thanks for your reply as it makes me think of pursueing the idea .As you found second motor uses less power and both fans running at higher rpm,so if rear fan had higher kv rating than front fan there would be a higher increase in verlocity producing higher dynamic thrust in a lot smaller dia. and higher flight speed.Regards,Ken Jack

This is your design as i see it.

   #########################
                        N       C         #########
                        N       C
                        N       C
   ENG1_ENG2  N       C
   ENG1=ENG2=N-----C
   ENG1_ENG2  N       C
                        N       C
                        N       C
                        N       C        #########
   #########################

ENG1=motor1
ENG2=moter2
N=FAN Normal clockwise rotating
C=FAN counter rotating

---- - -- ---- ---- --- -- --- -- -- - - -- - -- ------- -- - -- ----- -- -------------- - - --------- -- --- -- -----

made me think, trying to improve it
MAYBE even better design
I DO THINK THERE IS A REASON FOR NOT MAKEING clockvise/counter clockvise.
first it think the idea was born on the basis of Heavy propellers producing torque, to illiminate that effect especially on two-engined warbirds Counter rotating was born -at least i think that was how it happened.

Not knowing when that design you found, was from i think it was the early jet period.
still at lot of experimenting going on, on diameter and so on.
-BUT REALLY I HAVENT GOT I CLUE, just loved planes jet engines since i was a child.

----------- - --- --- --- -- --- --------------------------- --- -- -- - --- - ------------------

My idea, as the fuel driven jets, it has more blades, as your idea (more can be added, and outer diameter of the turbine can be decreased. -thus adding more more power, i think and less stress on the moters (at least i think so)

here it comes:

  #################
                      V1     N1   #####
                      V1     N1   N2    #####
                      V1     N1   N2    N3    ##########
                      V1     N1   N2    N3    N4
                      V1     N1   N2    N3    N4
     ##ENG1+ENG2  N1   N2    N3    N4
  ###ENG1=ENG2=N1=N2=--N3---N4-----
     ##ENG1+ENG2  N1   N2    N3    N4
                      V1    N1   N2    N3    N4
                      V1    N1   N2    N3    N4
                      V1    N1   N2    N3    ##########
                      V1    N1   N2    #####
                      V1    N1   #####
################

ENG1=motor1
ENG2=moter2
V=intake VANE
N1=FAN, pitch 6  - (clockwise rotating)
N1=FAN, pitch 7  - (clockwise rotating)
N1=FAN, pitch 8  - (clockwise rotating)
N1=FAN, pitch 9  - (clockwise rotating)

PITCH is not actual numbers, just to present the idea.
As Air passes N1 at a given speed, that airflow speed is increased by decreaseing the Duct before it hits N2, this has to be Pitched at a diffrent angle than N1, to run on the same axel, without slowing the airspeed down, but just enough to pass it though to N3.
Leaving N2 the duct is narrowed down even more, High airspeed agian BUT this time it is passed to the secound Motor driveing N3 and N4.
-hope it makes sense.. to you


Edited by Blind Vision - 06/Jan/2010 at 1:56am

Very interesting things going on in here!  

Where do you fly Ken jack, I would very much like to see these EDF's and learn some of your methods for making such items. I think you would have a fair bit of knowledge that would be quite valuable to learn.