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MK II H frame quad now flying

Posted by Vince Hogg on March 5, 2013 at 6:55am

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MkII H frame quad now flying.

Frame weighs about 60g less than Mk1 with much more room and accessibility to the nose sections. The arm O rings mounts are more firm than the Mk1 but vibration levels about the same. All RAW x,y,z accel vib about +- 1.5. Its possible to fly without reversed motors but the YAW rate is still much better with them reversed. As the arms are enclosed there is no problem if an O ring brakes and it has been flown with two missing on the same side.

I am now working on an internal nose gopro gimbal.

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Comments

  • Vince Hogg March 6, 2013 at 6:12am

    Antonie –

    Will try to get some dimensions up soon. For the time being its 510mm between motors – not diagonal.

     

    Robert –

    Yes they are quick to replace but if one fails there may be other things to repair. I the max total current I have seen was a 80A spike – usually 14A. They are 30A each, should be OK.

     

    Gary –

    Yes silicone O rings. They look twisted but thats because its needs a 90deg turn to line them up if you see what I mean. The MK1 had a 65g ali pad which was stuck to a foam pad – same size. I first put the new 75g aluminium pad on 4 20x20mm foam pads at each corner. It didn’t fly very well – with frequent twitching so I jammed up the pad to make it more rigid which cured the problem. I can only put this down to the lag that you are concerned about. Too much weight on too soft support. I didn’t expect that. Anyway the new ali pad is covered in lightening holes now and weighs about 45g and is 100% stuck to the foam pad. The vibration is up a bit but it flies much nicer. Lesson learned, low vibration is good but you don’t need to take it to extremes. The other thing that has changed – on the Mk1 the tube clamps are 80mm apart but the MKII they are 120mm. This considerably reduces the YAW imbalance displacement so it works with normal direction motors, but is still much better with them reversed.

    I did try it with direct APM mount and the vibration was low and flew nice BUT if I lose an O ring and the motor tube bottoms out on the frame it may put the vibs over the tuning limit.

     

    ESC

    http://www.unmannedtechshop.co.uk/30a-multi-rotor-esc-simonk-rapide...

     

     

    Motor

    http://www.fast-lad.co.uk/store/products_multicopter_motor_4008-530...

    not recommended for 14” props without modified prop driver or direct to motor props. –(shaft will slip). Shafts weak. I have replaced the shafts many times after minor ground contact. I have a 1/8 silver steel rod to cut them from.

     

    Battery

    4s 5000mah – usually I just use one but it will take 2.

     

    O rings

    http://export.rsdelivers.com/product/rs/bs115-sil70/silicone-o-ring...

     

     

     

  • MR60
    Hugues March 6, 2013 at 4:52am

    Hi Vince,

    Congrats! this looks great : design, functionality and creativity.

    Love it

    Hugues

  • Robert J. Brennan March 6, 2013 at 3:34am

    This design is very sleek.  I've been sketching up and working on a design of my own but haven't actually "turned the wrench" just yet.  Your placement of the ESC's is ingenious!  If you have QD plugs on either end, and you create small niche' cases around them, you could use industrial velcro or a latch system to hold them in place.  In the event of a bad ESC, you simply unplug the ESC via the QD's and install a new one.  Really ingenious design!  Good work!

  • Muhammad Al-Rawi March 5, 2013 at 6:47pm

    Airship. 

  • Developer
    leonardthall March 5, 2013 at 6:17pm

    Nice job mate!!!!!

  • Carl La France March 5, 2013 at 5:26pm

    Great Job I like your air plane as well. The only way to get some thing durable is make it your self  That is  about he size drones will become in the future   to be commercially viable  they will have to carry a reasonable pay load . Have a Great day!

  • Gary McCray March 5, 2013 at 4:49pm

    Beautiful plane Vince and I am certain nobody is ever going to accuse you of doing things the easy way.

  • Vince Hogg March 5, 2013 at 4:41pm

    A bit like this one?

    3692642921?profile=original

  • Gary McCray March 5, 2013 at 4:38pm

    Really, really nice Vince,

    I notice that your frame moves very little in relation to the arms on your O-ring arm suspension and that your performance level is very high.

    Are those silicone O-rings? Triple wrapped and look to be at least 1/8" cross section I imagine they snub frame / arm displacement pretty quickly.

    As you may know I have been concerned that this in the middle of the airframe vibration solution could induce significant and deleterious response delays between the flight controllers sensors and the power response, but that does not seem to be the case here.

    Do you have any secondary vibration control for the APM itself or is it fixed directly to your fuselage?

    I think your H design is excellent and my next Quad is going to take a lot of cues from your design.

    I have a small vacuum forming system I made and I have already laid out a CAD version of a somewhat smaller Kydex fuselage.

    You really need a bit of front end prop clearance and forward projection for good video options and the H design supports that very nicely.

    If you wouldn't mind, what are the actual motors, ESCs, props and battery setup that you are using?

  • Moderator
    Brian March 5, 2013 at 4:31pm
    Cool, looks like you could put a wing and canard and fly it as a plane!
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