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Passive thrust vectoring with anti vibration mounts.

Posted by Vince Hogg on January 29, 2013 at 2:28pm

 

 Have constructed an enclosed ‘H’ frame carbon/Kevlar quad with soft mount front and rear arms for vibration reduction. Initially yaw was awful as the arms tilted in the wrong direction and opposed any motor torque so I had to stiffen the mounts to prevent yaw reversal. Now I have reversed the motors in the code and the tilt actually helps the yaw. The mounts on the video are very soft, just to help demonstrate the movement but I think they were bottoming out.

Am quite pleased with the lack of vibration showing on the camera.

Apart from the motor reverse all parameters are completely stock. Will tweak them when I get some time.

 

Vince

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Comments

  • Vince Hogg March 13, 2013 at 2:53am

    Hi Eliana.

    Did you see the pics at the start of the blog? They should show how the tube is mounted, on o rings with zip-tie to the metal angle.

    The new frame uses 5mm carbon tube to hold the o rings.

    These are the tube mounts, also used to hold the motors on – but there are lighter mounts for that.

    http://www.ebay.co.uk/itm/4-x-Metal-Motor-Mount-Tube-Mount-for-X450...

     

    If you use those with o rings you must take off the sharp edges from machining, they will cut the rings. I used a dremel.

    Did you see the other blog?

    http://diydrones.com/profiles/blogs/mk-ii-h-frame-quad-now-flying.

     

    Vince

     

  • Eliana Stefani March 12, 2013 at 10:51pm

    I'm new to this, and am trying to mount some motors to a carbon fiber rod, and attach those rods to my frame. How did you do that in this video? I am planning in the future to try forward thrust vectoring for my quad too! Any ideas for the attachments? Either static (like you have on your H-quad) or dynamic for thrust-vectoring? Thanks, and good job on laying the carbon for the frame!

  • Lito P February 27, 2013 at 12:33pm

    That is beyond impressive...wow!

  • Vince Hogg February 24, 2013 at 2:01pm

    Mk 2 taking shape.

    Didn’t go for the pig ugly one. I really like having a front and back for orientation.

    New one has motor tubes going through so one snapped O ring is no longer a problem.

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  • Vince Hogg February 14, 2013 at 5:41am

    Interesting

    Have just discovered it flies with a broken O ring with one arm up at 20deg, not great though.

    I have just been adjusting some PIDs to see if I can smooth out its response to high winds and gusty conditions. Very nice with rate D up to .01

    Must get on with MKII that will be more secure with a snapped ring.

  • Developer
    leonardthall February 9, 2013 at 10:21pm

    Ah nice. Sorry, my bad.

    I wouldn't say pig ugly....

    I will post mine when I finish it off. Personally I think practical is more important the beauty but it is nice to get both :)

  • Vince Hogg February 9, 2013 at 4:18pm

    Thanks guys.

    Leonard, pics on page one. APM smack in middle below battery on ali block on 5mm foam.

    Do you need more photos?

    I am more convinced the key to a nice flying machine is lack of vibration, having experienced one with loads.

    Ive seen the videos of people balancing motors with bits of tape. Im too lazy, just mount the vibrating bits on rubber. I have not seen any issues that could be attributed to the extra lag in the system.

    ps MK2 design is pig ugly. Am having a re-think.

  • Joshua Ott February 9, 2013 at 2:55pm

    Vince, that looks like a smooth flying machine. Nice work.

  • Developer
    leonardthall February 9, 2013 at 2:06pm

    Where is your apm mounted? Looking great!! Could you take some photoes?

  • Vince Hogg February 9, 2013 at 9:34am

    Messing about in stab mode

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