25mm 9.5 degrees dihedral carbon tubes

Discussion in 'Cinestar 8' started by Thijm le Grand, Dec 30, 2016.

  1. Thijm le Grand

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    To get better position hold i used the holiday to do this carbon boom upgrade with 9.5° dihedral tubes.
    Although i think 5° would be enough. I could not find them anywhere. Other then tubes similar to the Alta design.
    Initial indoors tests shows very stable flight. With about 1-2% loss in lift.
    In the next weeks i will do more testing in windy conditions.
    http://flexirotor.com/14-bent-tubes-for-multirotors
     

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    #1 Thijm le Grand, Dec 30, 2016
    Last edited: Jan 2, 2017
    Jason Herring likes this.
  2. Chris Ross Leong

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    Many thanks, Thijm!
    I see the link to the Polish supplier in your original post above. However, I went there and their site is only half built - and it shows zero stock anywhere. Left them a message though, so I'm hoping to get some kind of a response.
    I see the arms are made out of 25mm stock. Is it 1mm thick rod stock? i.e. the internal diameter would be 23mm?
    Happy 2017 and let's see some shots!
    All the best
    Chris
     
  3. Mark Hoffman

    Mark Hoffman Member

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  4. Thijm le Grand

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    Hi Chris,
    The supplier told me this is his new site! The one i ordered from is the one Mark posted (http://www.carbon-cnc.eu/en/41-bent-tubes-for-multirotors) They are the same company.
     
  5. Thijm le Grand

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    Btw they are 1.3mm. So 25 x 22.4
     
  6. Chris Ross Leong

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    Many thanks again, Thijm!
     
  7. Ozkan Erden

    Ozkan Erden Distributor

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    Well, I have invested too much money for Cinestar 8 frames (I have 7 of them), so I'm not throwing it to the garbage.

    Here are the photos of the recent upgrades I did to the system. The drone is equipped with KDE 4014 motors, capable of carrying 14lbs payload for 10 minutes with 10Ax2 batteries.

    The arms are removable for transport. Ready to fly in 3 minutes.

    The swan arms are from carbon-cnc.eu
     

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  8. Michael McVay

    Michael McVay Active Member

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    Very interesting...thanks for sharing that.
     
  9. Chris Ross Leong

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    Thijm, hello!
    Any longer-term observations on the swan necks?
    Good decision to have made?
     
  10. Thijm le Grand

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    Atm it to cold to do more testing.
    Btw Ozkan is using the swan neck arms. I have installed the 9.5mm bent tubes
     
  11. Chris Ross Leong

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    Sorry, Thijm, I meant bent tubes, not swan arms.
    Chris
     
  12. Thijm le Grand

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    I have to wait. Still - 5c atm. Let you know when i have more info
     
  13. Chris Ross Leong

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    (slightly cloudy and rainy) 16 degrees C over here... : )
     
  14. Thijm le Grand

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    On set today with 18 knots wind speed. Surprisingly rock solid. Almost no movement in Gps. Not flyable in gps with old setup. 5% loss in lift.
    Dragon and Cooke mini s4. Weight 15.2kg.
     
    #14 Thijm le Grand, Feb 28, 2017
    Last edited: Mar 4, 2017
  15. Chris Ross Leong

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    Awesome.
    Thanks for the report, thinking of changing one of my X8's back to H8 with the swan arms. Carbon-cnc has already done work for me, Darek is an excellent fellow - will post when I've finished the build, it's more of an X8 with mantis arms.
     
    #15 Chris Ross Leong, Feb 28, 2017
    Last edited: Feb 28, 2017
  16. Chris Ross Leong

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    Thijm, did you use the regular tubes? Or the reinforced ones? I took some measurements off my Cinestar and concluded that Freefly used 1mm thick CF stock, which Darek offers as well as the 2mm thick reinforced tubes.
     
  17. Thijm le Grand

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    1mm for flat config is fine. min 1.5mm for coax.
    9.5° dihedral are 1.3mm, don't know how they hold with coax config
     
  18. Chris Ross Leong

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    Yeah, I'm going to go flat with the swan-arms. However, Darek just emailed me and said he's only got the reinforced ones left... : )
     
  19. Thijm le Grand

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    Hmmm. Not sure what to advice. maybe others can chime in.
    I like them to be a little flexible. So they damp minor unbalance in prop/motor. Impossible to balance props 100% without pro tools.
     

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