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Thread: The TBS DISCOVERY PRO - brushless gimbal quadcopter

  1. #8851
    Pilot doobie's Avatar
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    Jan 2015
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    ontario canada
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    1,279
    I was running t-motor 14x4.8. too much lift capability for too little weight made for a hard to tune and sometimes unstable quad. I could take most the jello out by trimming my throttle up on the radio, but in a hover was always climbing slightly. so I went to a 13x4.3 prop. I found the lower pitch prop flies more stable than the aggressiveness of a sharp pitch prop. I think the flatter prop is smoother running and the smaller 13" prop spins faster to hold up the same weight the 14" prop did thus removing jello completely eh
    flyin HIGH

  2. #8852
    Navigator Nabbs1's Avatar
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    Nov 2013
    Location
    Los Angeles, CA
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    54
    good info Doobie.Anyone know if they still sell Top plates? Looks like I have some trace breaks in a top plate I bought from someone. Apparently not brand new. Anyways do they let you send stuff to them for repair or testing? I opened a ticket with them but still no response. suppose it is sunday after all maybe I should chillax now that I think about it.
    Taranis / EzUHF
    Penguin/RVOSD ; Disco/nazalite/ezosd; DiscoPro/nazav2/iosd
    All radio gear is ImmersionRC.

  3. #8853
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    To keep this thread from dying - I still enjoy my Disco Pro.

    Shame there never was an effort to improve the gimbals's horizon issue. Why was there never an upgrade to newer AlexMos firmware versions available? Did Scrooge McTrappy not want to pay any more royalty fees to Alex?


  4. #8854
    Hive Mind Nightram's Avatar
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    Quote Originally Posted by mha View Post
    To keep this thread from dying - I still enjoy my Disco Pro.

    Shame there never was an effort to improve the gimbals's horizon issue. Why was there never an upgrade to newer AlexMos firmware versions available? Did Scrooge McTrappy not want to pay any more royalty fees to Alex?

    Pretty sure Trappy is continually shelling coin at Alex like everyone else keen on the hobby.

    Personally i have my Disco just about where i want it. Crossfire + pixhack setup. The only issue is the loss of hieght in horiz travel.

  5. #8855
    Hello

    I will receive soon 4 T-motors 800Kv2 to fit T-MOTOR 11x3.7 propelers (i have extended arms the folding one from hobbyking).

    what gain i can put with this setup arms + propelers ?

  6. #8856
    Navigator
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    Jan 2013
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    Netherlands
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    Was expecting a Disco Pro 2 this time of year...c'mon Trappy!

  7. #8857
    Hi! Maybe a bit offtopic, but still...

    I'm playing with programming and math for estimating flight time based on motors thrust tables, AUW and equipment amp's drain.
    The goal is to choose best set of motor+props for Disco Pro with foldable hobbyking's arms. Seems that i'm restricted to 11" props, so I'm just feeding to the script thrust data of motors with 11" props.

    Currently I do the following:
    1) feed the thrust data, which are usually sets of values for 50, 65, 75, 85, 100% throttle, interpolate values between those steps
    2) pass AUW with expected motor and battery
    3) pass amp's drained by other electronic equipment
    4) Calculate thrust per motor required for takeoff(hover?) as AUW/num_motors (4 obviously)
    5) Get interpolated amperage for thrust calculated before and multiply it on number of motors - so i get the ampers drained for hovering
    6) Divide battery capacity (*0.85) on value calculated above and convert it in minutes

    So, for example with T-Motor 3508 700kV, 11x3.7CF props, AUW 2075g, LiPo 5200mAh 4S (Multistar, 475g) I get estimation of 15 minutes flight time (56% throttle for hover)
    And same setup with LiPo 8000mAh (705g) and AUW 2305g I get estimation of 20 minutes flight time (61% throttle for hover).

    Which is only +2 minutes in both cases to estimation for current DJI e300 setup.

    Could someone estimate how accurate those data might be based on algorithm I explained or some real data? I wasn't able to find flight times for similar setup on the net.
    And also I'm not sure if I'm using the right algorithm for those estimations, I would be very grateful if someone could point me out my mistakes.
    Last edited by SthPhoenix; 6th January 2017 at 02:11 PM.

  8. #8858
    Quote Originally Posted by SthPhoenix View Post
    Hi! Maybe a bit offtopic, but still...

    I'm playing with programming and math for estimating flight time based on motors thrust tables, AUW and equipment amp's drain.
    The goal is to choose best set of motor+props for Disco Pro with foldable hobbyking's arms. Seems that i'm restricted to 11" props, so I'm just feeding to the script thrust data of motors with 11" props.

    Currently I do the following:
    1) feed the thrust data, which are usually sets of values for 50, 65, 75, 85, 100% throttle, interpolate values between those steps
    2) pass AUW with expected motor and battery
    3) pass amp's drained by other electronic equipment
    4) Calculate thrust per motor required for takeoff(hover?) as AUW/num_motors (4 obviously)
    5) Get interpolated amperage for thrust calculated before and multiply it on number of motors - so i get the ampers drained for hovering
    6) Divide battery capacity (*0.85) on value calculated above and convert it in minutes

    So, for example with T-Motor 3508 700kV, 11x3.7CF props, AUW 2075g, LiPo 5200mAh 4S (Multistar, 475g) I get estimation of 15 minutes flight time (56% throttle for hover)
    And same setup with LiPo 8000mAh (705g) and AUW 2305g I get estimation of 20 minutes flight time (61% throttle for hover).

    Which is only +2 minutes in both cases to estimation for current DJI e300 setup.

    Could someone estimate how accurate those data might be based on algorithm I explained or some real data? I wasn't able to find flight times for similar setup on the net.
    And also I'm not sure if I'm using the right algorithm for those estimations, I would be very grateful if someone could point me out my mistakes.
    I'm terrible at calculations (and lazy) so I just use ecalc.com. It's not 100% accurate, but usually quite close

  9. #8859
    Quote Originally Posted by RENOV8R View Post
    I'm terrible at calculations (and lazy) so I just use ecalc.com. It's not 100% accurate, but usually quite close
    I know about eCalc, but it's free version won't provide motors I need ) And also it's just interesting to understand the underlying math )

    P.S. (added later) It's seems from my script and eCalc estimations for 11x3.7 props and AUW in range 1800-2500 best motor is 3110 780kV, could anyone confirm?
    Last edited by SthPhoenix; 6th January 2017 at 07:01 PM.

  10. #8860
    Navigator BrunoBL's Avatar
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    Jul 2014
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    Santa Catarina, Brazil
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    319
    Hey guys,

    Some time ago I saw someone post here a 3D-printed swing-to-open battery clamp that replaces the Velcro bands for fixing the Discovery (Pro/Standard) quad battery. It seemed very cool at the time but unfortunately I lost track of it and however I searched, could not find any reference to it. If someone has any pointers, could you please post so I could purchase and/or have the parts 3D printed from file? Many thanks.

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