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Old Apr 03, 2010, 05:39 AM
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Meopham, Kent UK
Joined Jul 2008
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Monocopter

Not a Multi Rotor, but still it is interesting - a nice piece of work.

Worlds first controllable robotic samara monocopter MAV, University of Maryland's Ulrich flyer (6 min 38 sec)
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Old Apr 03, 2010, 03:40 PM
Tri-Quad-Hexa-Octo-copters!!
United States, TX, San Antonio
Joined Feb 2007
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I saw a video on RCG of someone that built one similar to that and was able to fly it, but with no directional control. I wonder how they managed to get directional control? Here is a Lockheed Martin version: http://www.nationaldefensemagazine.o...lingDrone.aspx
Lockheed Martin Samarai monocopter UAV (2 min 52 sec)

Found MIT's version:
MIT monocopter - flight down infinite corridor (0 min 56 sec)

and Univ of Mayland's version same Kevin Ulrich inventer as your video:
Maple Leaf Remote Control Monocopter (maple seed) (1 min 46 sec)

The inventer Kevin Ulrich's videos:
World's first controllable MAV monocopter, Robotic Samara (maple seed) (2 min 39 sec)

Other links:
http://www.gizmag.com/worlds-smalles...ce=PESWiki.com
http://www.rcgroups.com/forums/showt...ght=monocopter
Cheers,
Jim
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Old Apr 03, 2010, 05:02 PM
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Arivaca,Arizona
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I'd seen this a while back....as Spock would say "Fascinating". There was a toy that had directionals while spinning. RS carried it. it must have a "directional "antenna or similar device on the rx to keep its orientation. I dunno???
it is cool....I buy one.

regards,
Bill
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Old Apr 03, 2010, 10:53 PM
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Meopham, Kent UK
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A nice MIT report here:
http://rimworld.com/pgh/documents/hoburgmcreport.pdf

Looks like they use a single axis magnetometer and look for zero-crossings.
Some other good information
- two bladed prop is not desirable due to vibration
- HS-55 servo for cyclic control
- Not brilliantly efficient, 32Watts and 170g equating to 5.3g/W

Veratech Aero Inc seem to be developing a commercial one.......possibly stalled?
They have a couple of videos.
http://veratech.aero/phantom.html

Steve
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Last edited by airbotix; Apr 03, 2010 at 11:17 PM. Reason: more info
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Old Apr 04, 2010, 07:31 AM
Tri-Quad-Hexa-Octo-copters!!
United States, TX, San Antonio
Joined Feb 2007
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Good info and finds Steve, thanks! It appears that Veratech was way ahead of Kevin Ulrich's by several years build in 2006. More University stud plagiarism at work
Cheers,
Jim
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Quote:
Originally Posted by airbotix View Post
A nice MIT report here:
http://rimworld.com/pgh/documents/hoburgmcreport.pdf
Looks like they use a single axis magnetometer and look for zero-crossings.
Some other good information
- two bladed prop is not desirable due to vibration
- HS-55 servo for cyclic control
- Not brilliantly efficient, 32Watts and 170g equating to 5.3g/W
Veratech Aero Inc seem to be developing a commercial one.......possibly stalled?
They have a couple of videos.
http://veratech.aero/phantom.html
Steve
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Old Apr 04, 2010, 10:35 AM
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Meopham, Kent UK
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Quote:
Originally Posted by Air Vaca View Post
it must have a "directional "antenna or similar device on the rx to keep its orientation
A good guess Bill!
Veratech Aero mention a partially directional antenna in their 3 patents.
They also claim cyclic control is achieved without a servo, using the two tilted thrust motors.
Differential modulation of the thrust allows pitch control of the lifting aerofoil - an elegance of simplicity if it works well.

Not sure where they are on their Quadrotor designs.

So here's a question:
Do we think it possible for a quadrotor to land safely with a failed prop?
The idea is to automatically detect this & shut down the two diametrically opposite motors.
Let quad spin in torque reaction and hope the remaining control loop can do the rest.

Maybe a more extreme version of this:

X-BL ACC FAST YAW (4 min 33 sec)


Can't help thinking it would still precess to tip over unless there is a low c of g.....

Steve
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Old Apr 04, 2010, 07:05 PM
Tri-Quad-Hexa-Octo-copters!!
United States, TX, San Antonio
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Steve,
That is Chessman21's video with yaw Kyawstick and Kexpo values adjusted for the fast spin on his X-BL/X3d from back in July 2008. On the topic of prop failures and safe landings, there have been some brainstorming posts going on here: http://www.rcgroups.com/forums/showthread.php?t=1203569
Cheers,
Jim
Quote:
Originally Posted by airbotix View Post
So here's a question:
Do we think it possible for a quadrotor to land safely with a failed prop?
The idea is to automatically detect this & shut down the two diametrically opposite motors.
Let quad spin in torque reaction and hope the remaining control loop can do the rest.
Maybe a more extreme version of this:
Can't help thinking it would still precess to tip over unless there is a low c of g.....
Steve
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Last edited by jesolins; Apr 05, 2010 at 05:29 AM.
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