Testing ducted fan quad, flies great.  My intention was to build a tricopter but just had to see how a quad would fly with 90mm EDF's.  Also tested as a "V-Tail" in the quad configeration, it flies with a 15 degree rear facing angle and is more sensitive to inputs. 

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Comment by Rob_Lefebvre on May 8, 2012 at 5:42pm

Wow, that's impressive!  Can you share your recipe?  Which fan units, motors, ESC, and flight controller?  Is that APM?

It didn't even sound bad! It actually sounded even better than a quad, to me at least.

Comment by Vishal on May 8, 2012 at 6:04pm

Very cool!  Which battery do you use and how much flight time do you get on a full charge?

Comment by Ed Kirk on May 8, 2012 at 7:02pm

The frame is from Multiwiicopter, the Stealth

Motor/esc's are the 90mm 5 bladed units from Hobbyking

ESC's are Turingy Plush 60 amp from Hobbyking

Flight controller is the Quadrino from Flyingeinstein using Multiiwii 2.0 and Arduino 1 (I have invested a lot in the APM1 and APM2, finally gave up) sorry guys.

The fan required a lot of modifications, I am going to re-do them with a saddle attached to the outside.  Right now I use the Multiwiicopter Scarab motor mounts on 12 x 10mm CF arms.  This is a very strong setup but must take away from performance.

It flies pretty good with a 4S - 2650ma battery and gets about 3 minutes.  It really haules on a 6S and gets 5 minutes with a 2700ma and I have been flying it very hard.  I am sure it will get longer flying time with better motors and move to an external mount.   

It is not too noisy until I apply some heavy throttle.


I believe there is a future with a shrouded fan, ducted fans are designed to work best at extreemly high RPM, I run well below half of what it is designed for.




Comment by Rob_Lefebvre on May 8, 2012 at 7:20pm

Yow, that is a tragic way to mount it.

Is it this fan you're using?


Comment by Ed Kirk on May 8, 2012 at 7:28pm

Yes, same fan, they used to be under $49.00.  Everything except the motor is also available for under $18.00 before shipping and Custome fees.  That's why it is my first choice, I can really "hack" away at the housing and afford to experiment with it.  Sorry about the dirty word "afford".


Comment by PACEFE on May 8, 2012 at 7:40pm

Hi, nice setup.

Would it be possible to port multiwii soft to apm? I really would like to test it but cant afford to by new hw.


Comment by Hyon Lim on May 8, 2012 at 8:26pm

Hi. How did you get pusher prop for ducted fan?

I also interested in ducted fan quad, however, I have no idea for reverse-pitch ducted fan.

Give me a comment!

Comment by Ed Kirk on May 8, 2012 at 8:33pm

Hyon Lim,

Don't need a pusher prop, that is the beauty of the ducted fan,  Just angle them.  All the controller instructions show motor rotation, if the prop turns clockwise then rotate the fan clockwise and the same for counter clockwise, rotate the fan counter clockwise.  Don't ask how far, I don't know,  I just put about 15 degrees by the eyeball and as you can see there is plenty of yaw control.



Comment by Cliff-E on May 8, 2012 at 9:21pm

"more sensitive to inputs"

Sounds more like the 90mm fans are the main reason for it being more sensitive. You're pushing some major thrust!! (of course, vector thrusting of the DF's will be more direct too). I've run a 65mm DF tricopter and the thing easily lifted 2kg, frame was 30" in diameter... Problem was I was using old-school analog gyros--never could hover it.

Glad you tried it, multi-DF's do have a place in the multicopter world. Though I hate the fact you need more ESC power too. I have 4-55mm DFs ready to go on an old APM1.4, just looking for the time to get to it.

Comment by Juan Soler on May 8, 2012 at 10:23pm

God work!  I am impressed with the  Multiiwii 2.0 and Arduino Uno (which my friend Ken sent me) it is actually rock solid in my 400mm Quad.  I can only say that I fully concur with your thoughts on the APM1 and APM2 :(


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