QRM [DIY quadcopter] update 2


This week all necessary parts for the QRM quadcopter arrived, and we test fitted them on the aluminum prototype frame. Everything fitted perfect, and we finalized the designs so that the frame could be machined out of carbon fiber.

 Together with the parts ordered at Hobbyking we bought a couple of 100x300mm 1.5mm thick sheets of carbon fiber. We managed to nest all the parts on two of these sheets, reducing the waist material to a minimum. When machining carbon fiber the material that is chipped away are minuscule fibers that you really don't want to inhale. (not often anyway) The parts could be machined using a vacuum cleaner, but we chose to make a bath in which we can machine the carbon fiber under water. This was done purely as a dust collecting mechanism, and not as coolant.




As you can see above we tabbed the parts so that they wouldn't come lose while machining. Both sheets where machined on our home build CNC machine, with a 2mm spiral toothed solid carbide endmill, with a full-depth cut. Machining took about twenty minutes per sheet, and we recorded the whole process. The water got black almost instant, so the machining itself isn't viable. We fast-forwarded the movie, and cut out some parts. You can see the sheets being taken out of the bath at 1:40 and 3:00

After machining the parts, we started assembly. The video below is fast-forwarded, the real time was about one hour. The only thing left to do is to connect all the electronics, set up the control board and see if she flies!

The total ready to fly weight will be around 250 grams!



Larger images are available on:

Gallary Dennis Martens - QRM quadcopter

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  • Hello Vladimir,

    The CAD files are already released, like Bryan linked. They are free to download, good luck making a replica.

    How generous of you to offer a donation, but this really isn't necessarily. We are doing this as a hobby and releasing the files is our way of doing something back to the community.

  • The CAD files are linked in the YouTube videos.


  • Hi guys,

    This design looks sweet. Any word on releasing the CAD files?? I would love to try to mill this out of CF with my own mill. I am willing to donate some $$ to support this excellent work if the CAD is made available.


  • Hey, I could get CAD files for CNC cutting? Send a private message to ;)


  • I would love to purchase a frame or two- friend request sent so I could send a PM.

  • This is an interesting wee design, that im keen to have a wee play with! are you able to send the cad drawings out to me?

  • how much for a set?? and when you mean a "set" what does a set contains?? is it inclusive of motors and props and esc? power distribution?? is it on my understanding that i only need to add my rx/tx and batt pack? :) 

  • very nice indeed! i could see my open pilot going in nicely.

  • If you are interested in a set, please contact me by private message!

    The whole quadcopter is custom build for the parts we ordered at Hobbyking. The Hobbyking control board has a mounting hole spacing of 44mm, and other board with the same hole size will fit. (all the KK multicopter clone boards) Other electronics will fit, but need a different top frame plate.

  • Moderator

    Re the name Google Q code. also as in QNH and QFE now your a UAS or RPAS driver, its all letters ;-)

    QRH What is your wavelength in meters? My wavelength is ____ meters.
    QRJ How many words have you to send? I have ____ words to send.
    QRK How do you receive me? I am receiving (1-5) where 1 is unreadable and 5 is perfect.
    QRL Are you busy? I am busy.
    QRM Are you being interfered with? I am being interfered with.
    QRN Are the atmospherics strong?

    Atmospherics are very strong.

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