Welcome to InspirePilots.com

Join the leading DJI Inspire community for free!

Inspire frame ...

Discussion in 'General Discussion' started by Dobmatt, Feb 23, 2016.

  1. Dobmatt

    Joined:
    Dec 13, 2015
    Messages:
    244
    Likes Received:
    93
    The early models of Inspire were build with mesh type carbon fiber tubes, if I'm not mistaken. Late models, however, employs so called camo tubes, nicknamed for random fiber pattern:
    inspire arm tube.jpg
    Accordingly to Clearwater Composites, leading US manufacturer of carbon fiber profiles, "...the two tubes in question are made with completely different manufacturing processes: "camo" being filament wound (one continuous filament wrapped onto a mandrel), while mesh pattern is roll-wrapped (each layer of carbon fiber laid up in specific orientation). Roll-wrapped tubes are typically stronger, stiffer, and more consistent than filament wound tubes..."

    Judging by documented crash landing reports, tubes are rarely surviving in one piece. Extremely difficult to repair or replace ...

    What was the reason to make such change, other than cheating and corner-cutting? I'm far from such accusations ... From engineering point of view there may be one only I can think of, but I'll remain silent for now. Perhaps somebody close to DJI engineers know more than I do?
     
  2. lake_flyer

    Joined:
    Jul 17, 2014
    Messages:
    1,121
    Likes Received:
    354
    My guess is that the camo layer method reduces vibration (fibres are pointing in every random direction) and makes the tubes more stiff overall.

    There's absolutely no reason to assume that these tubes wouldn't be up to their job, which is holding the motors (as vibration free as possible) in position, and secondary as landing gear to allow enough clearance from the ground for take off and landing. And when they break in a crashlanding, they reduce the energy of the impact for other parts.
     
  3. seanmclean

    Joined:
    Jan 22, 2016
    Messages:
    309
    Likes Received:
    83
    There's really very little to do with the carbon patterns, mostly just aesthetics. Most high-end carbon bikes use the 'random' pattern, and they see stresses far in excess of what an inspire might.
     
  4. Dobmatt

    Joined:
    Dec 13, 2015
    Messages:
    244
    Likes Received:
    93
    That's the good point: sacrificial design. As I mentioned clearly I'm far from being suspicious about manufacturers conspiracy to cheat and implement cheaper materials in following versions of aircraft. It's just the observation of an seasoned engineer and hobbyist like myself, nothing else...
     
  5. Mad_angler1

    Joined:
    Dec 9, 2015
    Messages:
    441
    Likes Received:
    160



    Sent from my iPhone using Tapatalk
     
    AlanB likes this.
  6. The Editor

    The Editor Moderator
    Staff Member

    Joined:
    Aug 7, 2013
    Messages:
    6,734
    Likes Received:
    3,891
    Money.
    DJI wouldn't give a monkey's about whether certain parts absorbed or 'gave' on impact to protect others. It's not their machine, it's yours.If you crash, it breaks, you pay. In fact the more that breaks the more you pay.
    Purely a cost incentive exercise no doubt driven by the faceless blood sucking accountants.
     
    damoncooper, ianwood and unyks like this.
  7. Dobmatt

    Joined:
    Dec 13, 2015
    Messages:
    244
    Likes Received:
    93
    ouch ...
     
  8. Mad_angler1

    Joined:
    Dec 9, 2015
    Messages:
    441
    Likes Received:
    160
    Rather harsh lol


    Sent from my iPhone using Tapatalk
     
  9. Dxtrty

    Joined:
    Sep 7, 2015
    Messages:
    48
    Likes Received:
    2
    Location:
    EU
    Next model, back to the braided with a little aramid maybe.
     
  10. Luis Morales

    Joined:
    Apr 15, 2015
    Messages:
    270
    Likes Received:
    120
    Location:
    Madrid
    this is the tube in the inpire pro black, i guess this would be latest model right now?
     

    Attached Files:

  11. Dobmatt

    Joined:
    Dec 13, 2015
    Messages:
    244
    Likes Received:
    93
    Apparently it is the latest version of Inspire. Perhaps they've realized that the "camo" tubes aren't up to the task. After all it depends on wall thickness as well, so let's wait and see how the new tubes performs...
     
  12. Mad_angler1

    Joined:
    Dec 9, 2015
    Messages:
    441
    Likes Received:
    160
    It's more like what's cheaper this quarter, new supply deal I suspect, one undercutting another.

    In this application that carbon tube is massively strong and no chance of being an issue regardless of construction


    Sent from my iPhone using Tapatalk
     
    Bigdz likes this.