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Upgrading Cinestar 8 for longer flight time

Discussion in 'Cinestar 8' started by Hannes Frigård, Aug 27, 2015.

  1. Hannes Frigård

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    I'm currently operating Cs 8 with 4S batteries (two 10.000 mAh in parallel). AUW between 8 - 9 kg. Would need to increase flight time from 10 - 5 minutes to 15+ minutes. Also AUW should be increased a little.
    It seems to me that going for 6S batteries could give what is needed.

    My plan would be:
    Change Esc's from T-motor 40A to Maytech 45A-opto with Simon K firmware
    Change Axi 2826/12 motors to T-Motor U5 KV400
    Change batteries from 4S to 6S

    Does anyone have experience with T-Motor U5's with this AUW?
    Also: would it be beneficial to change to X8 configuration?
     
  2. Dave King

    Dave King Well-Known Member

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    I ran the U5's all the way to 11.5KG without issues but that was pushing it a little bit. You should be fine with 8-9KG easy. IF you switched to KDE 4012 motors and KDE ESC"s you could get active braking which helps give you a little bit longer flight time. Even if you don't you should have no problem getting 18-20 minutes flight time even with 10KG and 2 10,000 6S batteries. With X8 8-9KG might be at the limit factoring in a 20% loss in thrust. If your goal is to get longer flight time stick with the flat 8.
     
  3. Hannes Frigård

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    Thanks for info Dave.
    I've now ordered the U5's and Maytechs (got them very economically = cheap...).
    Which propellers have you used?
     
  4. Dave King

    Dave King Well-Known Member

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    I used 16 inch tigers with those motors.
     
  5. Hannes Frigård

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    Thanks Dave.

    I think I'll stick with flat 8, as you suggested.
    I have only 450mm booms, so 16 inch props don't fit, lets see if I can fit in 15's...
     
  6. Dave King

    Dave King Well-Known Member

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    YOu need at least 500mm booms for 15's.
     
  7. Hannes Frigård

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  8. Dave King

    Dave King Well-Known Member

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  9. Hannes Frigård

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    Thanks for advice, Dave. Although cheaper, they are also heavier...
    Regarding booms; could there be flex problems with "regular" 25x23x500mm tube, or is it better to use the thicker 25x22x500mm version?
    Price of the regular version is almost half of the thick.
     
  10. Dave King

    Dave King Well-Known Member

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    I use the thicker ones.
     

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