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This work is extremely interesting for me. I am very interested in the status of your work with a standard propeller as a ducted fan. What can you share?
The duct pretty much compensates for its own weight, we are using them more for an additional safety feature than the increased thrust. The ducts don't vibrate all that bad. We did cut the rotors down to get the gap we wanted between the tip and the duct. I didn't balance the rotors we used in the one pictured at all, I wanted to see how bad it would vibrate from cutting the tips off and it made no noticeable difference. We are having a local pan company (Lloyd Pans in Spokane Washington) spin them for us. I based the original design off of a 9" cheese cake pan.
@Jochen, the gap is just under 1/8th (0.125") We have a new version of the duct that has a lot shorter height and weighs about 125 grams each (just over 1/4 lb). The ducts do help increase the thrust as well by increasing the airflow into the rotor.
We have tried using EDF's and they only work for fairly small frames, ours is almost 24" diagonally center to center.
Looks great! How is the motor and blade performance with a tri-blade and duct fan configuration versus a normal blade configuration without the duct assembly? Do you have the motors on a thrust vector or is the motor assembly on a pivot? Very cool!
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