Blogs

U8 large quad

Posted by renaud barbier on March 10, 2014 at 12:00pm

https://www.youtube.com/watch?v=105CfuFx6yI

 

After months waiting for motors and props, we finally managed to put our large quad up in the air!

 

It flies up to 56min and can currently carry nex 7. next one will be with zenmuse 5D! can't wait!

 

It was pretty difficult to get the right setting as the 29" props run very slow on those 135kV motors.

 

The copter flies really like a big truck! quite nice!

 

Enjoy.

Tags: 135kv, tmotor, u8, flight, long, quad
E-mail me when people leave their comments –
Follow

You need to be a member of diydrones to add comments!

Join diydrones

Comments

  • MR60
    Hugues March 11, 2014 at 12:47pm

    APM has indeed reached its processing capability limits (RAM & CPU limits) that is probably a limiting factor to compute complex stabilisation at frequent enough cycles.

    Pixhawk does not have these limits, so I would expect Pixhawk could compute at higher cycles much more complex stabilisation algorithms. There is no reason I see why it could not reach or exceed a wookong (just a matter of time and firmware releases).

    Just an opinion.

  • Paul Jenness March 11, 2014 at 12:29pm

    Very interesting info regarding large copters and APM.. I presume pixhawk is in same category.

    Is it just because it has yet to be stress tested with bigger machines? (understandable..its a hobby community with hobby budgets).

    I can see copters gradually getting bigger for more uses so I guess Pixhawk would need be required to adapt?

    Thoughts from devs / ChrisA ?

    Cheers

    -P

  • eduardo March 11, 2014 at 6:11am

    56min with or without the cam/gimbel ?

  • Developer
    John Arne Birkeland March 11, 2014 at 2:24am

    Efficiency wise, this is very good. But how does it handle turbulence with such large propellers and slow RPM?

  • renaud barbier March 11, 2014 at 2:14am

    my biggest setup on APM is 18" props and that works fine

  • renaud barbier March 11, 2014 at 2:14am

    with apm 2.6, I never managed to get the altitude hold right. also the overall copter response to the wind was not as easy to setup as for the wookong.

  • Charlie March 10, 2014 at 11:05pm

    Paul,

    I tried also apm on large copters and it seems that it can't handle vibrations from big size props. In my research i didn't found anybody flying aerophotography with props bigger than 15 inch with apm. I switched to A2 and it was like day and night.

    I still use apm for fpv fun and planes.

  • Paul Jenness March 10, 2014 at 10:16pm

    Im curious to why you thing APM2.6 was not good. Are you goign to try the pixhawk with this setup. Im curious as Im interested in the larger copter also and how it may be controlled with pixhawk compared to the more expensive alternatives.

    Cheers

    -P

  • renaud barbier March 10, 2014 at 9:13pm

    Niall, these are Tmotor carbon props

    Felix, we use 2 units of high end 11000mah...

    Adam, the way forward is X8. not sure if the fail recovery algorithm can work on such large quad due to inertia. on the videos I saw that while in recovery, they spin pretty fast!

  • Adam Erickson March 10, 2014 at 9:09pm

    I love these big quads, but I would not consider one currently due to the lack of redundancy, which makes carrying an expensive payload sketchy. If we are able to get the quadcopter propeller/motor/ESC fail recovery algorithm from ETH-Zurich or similar, I will definitely consider one.

This reply was deleted.