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A multi-ducted fan design is for all intents the same as the multi-rotors already discussed, although they will have slightly greater efficiency due to less blade tip related losses. If you want to build a proven successful design, then by all means, you'll want to stick with the multi-prop design. I personally can't help but to go off the beaten path for many projects, although this of course is the reason many of them have been unsuccessful.
Upon looking for a good source of model ducted fans, I came across a thrust vector kit (http://www.hobby-lobby.com/360_degree_thrust_vector_upgrade_set_rc_airplane_spare_parts_390761_prd1.htm) for a R/C SU-34 (http://www.hobby-lobby.com/su34_twin_360_degree_vectored_thrust_jet.htm), and now my imagination is running wild!
Rob v.d. berg said...
sounds very interesting, where can i find it
The MG1101 looks expensive and it's about 14-15mm cube, 2-axis. We could mount 2 on the pcb to get 3-axis and it's digital I2C. I couldn't find a source and it's quite old in this arena.
Think I am going to settle on the following for the sensor pcb. Basically it's similar to the 9DOF from Sparkfun with a prop instead of the Atmega, plus pressure, temp, and maybe ultrasonic for ground proximity.
Before anyone comments why don't I use the Atmega - it's a prop project!!!
* Propeller & EEPROM etc
* LPR530AL (or LPR550AL)
* LY530ALH (or LY550ALH or LPY versions)
* ADC 4 channel or micro TBD
* PMB-248 or PMB-648 or #28146 GPS Module (GPS from Parallax)
Any suggestions for ground sensing? (maybe need to detect from 5m) Perhaps the Parallax Ping))) sensor could be used???
Robert T said...
There are several Ping sensors with different beam projections but the ultrasonic sensor would not work if there is moderate pitch due to angle of reflection. The copter would have to be almost flat I would think and relatively close to a reflective surface.