From Hack-a-day. This ducted-fan beast uses the Sparkfun 6DoF IMU that Jordi wrote the software for. No, it hasn't flown yet.
Behold the Land-Bear-Shark, a quadcopter on a rather grand scale. At a full eight kilograms it’s an easy target to compare the [Howard Hughes] behemoth, but in addition to the weight, this still has yet to make its first flight.
To give you some scale to the image above, the board at the center is an Arduino. It controls the beast, along with the help of a SparkFun IMU board which rides atop. Really, if any quadcopter of this size has a chance of working, this should be the one. The construction is beautiful, making use of carbon fiber rod along with 3D-printed connectors to assemble the frame. A lot of thought has gone into small things like conserving weight used on the landing gear, which are incorporated into the bottom corner brackets. The batteries are connected in a manner that makes them easy to adjust, acting as ballast for balancing the craft.
Comments
I think this all just depends on the intent. As a camera platform it could be beautiful with nice, slow, graceful movements, no jerking around. I nice, consistent panning and zooming. Can't think of much else use for it. It would get quite boring after the second or third light.
I'm building a variable pitch quad rotor that can use 500 mm blades, currently using 350 mm blades
http://diydrones.com/forum/topics/my-heavylift-quadcopter
Wow!!!
Since the topic is big, here is a full size octo.
https://www.youtube.com/watch?v=_3yjpX54s_U
I CW for stbilize that kind of Quad you need to put flap above the ducted fans so you can govern the yaw. I doing a lot of test on a special huge quad and that is better solution
I've built a 36" tricopter using 65mm ducted fans, was able to lift and hover at 4ft, BUT no yaw stability and precision yaw control sent the thing spinning. The control laws are somewhat different from what I found (can't say due to job). And having servo-actuated vectoring is in the end a bad idea--too much weight and complexity for the thrust EDFs put out.
I do have a 1260APM laying around and 4 55mm ducted fans... nice recipe for another experiment here. :)
Another Example of Heavy lift developed using mp32 :
https://www.youtube.com/rnavoni#p/u/27/cXRwh7zsD8s
An other solution is to use 1 motor and variable pitch propeller
http://www.virtualrobotix.com/video/hg3-willy
... we yet fly last year in that configuration .... this year instead i develop a lot of heavy lift as
VR Dragon
http://www.virtualrobotix.com/profiles/blogs/foxteam-support-and-im...
best
Roberto
It should be pointed out that this design includes a servo at each fan.
With advanced control algs, this could be quite agile and stable (turning a fan can provide Immediate gyroscopic-control ; followed by vectored thrust ; followed by differential thrust.)
Have fun with that.
@Chris
the Levitake.de Copter ???
But, but, it is not my impeller based UFO !
Please visit my Propeller Shroud Project, you will see my homemade shroud, not exactly the same thing!
Soon, you will be able to criticize my tri-shroud/quad-shroud.
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