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Thread: The VectorTank - L

  1. #1
    Navigator TalonSix's Avatar
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    The VectorTank - L

    So in the Cinetank - L thread I posted some frustration with the TBS Discovery. Great frame, but the Cinetank was my first build so I was not entirely satisfied with the Disco. Getting the battery in and out of the Disco was particularly frustrating for me and I could never get rid of the jello, even after trying half a dozen different types of rubber bands and the squishy TBS Love Seat. Additionally, I was also using a Vector as the FC rendering most of the advantages of the Disco's integrated goodies moot.

    Enter the VectorTank - L:


    The flight camera is not the final solution for this - it's just a spare that I had laying around. It hangs about 2mm lower than the landing pads unfortunately. I've got a new 32x32 flight camera coming from SurveilZone, but it's apparently on the proverbial slow boat from China (perhaps even the literal slow boat from China...who knows?)

    I had a heck of a time figuring out where to mount the PSU. Using 12 gauge wire from the cinecoin to the PSU didn't make things any easier, but I didn't see any alternatives. In the end, I went with mounting the PSU upside-down on the right side of the aircraft. It works pretty well here, but I have to put the battery in leads first.


    Challenge #2 with this build has been weight and balance. The Vector cuts down on a lot of weight just through its integrated design. Couple that with a 4200mah 4S battery, and I had a very tail heavy tank. I love how the tank holds the battery in the frame, so top mounting the battery for CG wasn't an option for me. I wound up wrapping a stack of flat washers in electrical tape and mounting it behind the GoPro to get the CG right.

    Here's some more detail shots of how I mounted and wire managed the Vector:




    For the power train, I'm using the TBS bulletproof ESCs and 750kv motors with 10" Graupners, all of which were on the Disco. The 10" props are too small however; I'm having to go to about 60% throttle to maintain a hover.

    So overall, the tank went together just as great as always. I definitely prefer the cinecoin over the Afro PDB that I used in my first tank. I can also see the quality improvements made to the motor mounts. On the down side, the standoffs in the dirty section seemed about 2mm too short, causing the dirty section top plate to flex when I tightened everything down. Additionally, the screws securing the boom mounts to the dirty section were a bit too long; I can't tighten them all the way up without the screw tips poking out from the landing pads. Finally, I would not recommend the TBS bulletproof ESCs for this frame. I only used them because they came off the Disco. I had to make extension wires leaving a total 24 possible points of failure based on my soldering skills.
    Last edited by TalonSix; 8th August 2014 at 10:34 PM. Reason: grammar and clarity...

  2. #2
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    Hi Talon,

    Thanks for sharing your build. I'm intending on doing a similar setup (ie with Vector etc) so it was very timely for me. I'm also intending on using FrSky X8R which you seem to be using as well. I've seen the way a few people have installed the X8R antennas but you seem to have done something i've not seen before which looks interesting. Would you mind explaining and providing some more photos?

    Would also love to see a photo of your setup with battery installed - i couldn't quite follow your description.

    Any idea on flight times as yet?

    Thanks

  3. #3
    Navigator TalonSix's Avatar
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    The receiver block was one designed by forty2 here on FPVLAB. It's for sale on shape ways IIRC. I detailed how I did the V antenna setup here.

    Yeah my battery description did kinda stink, huh. I'll post some pics of the VectorTank with the battery installed tomorrow morning.

    I haven't been able to do anything beyond hover testing in my yard, so no idea on flight times. Based on battery depletion however, I'm anticipating around 9-11 mins. More to follow.
    Last edited by TalonSix; 8th August 2014 at 10:32 PM.

  4. #4
    Navigator TalonSix's Avatar
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    Here's a shot with the backwards battery. It works pretty well.

  5. #5
    Navigator TalonSix's Avatar
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    This just in.

    15 mins hover time at sea level with the following power combo:
    • TBS 30A Bulletproof ESCs
    • TBS 750kv motors
    • Lumenier 4200mah 4S lipo
    • Graupner 11x5 e-props


    Booya!


  6. #6
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    Nice setup!

    Out of interest, how have you mounted the X8R's antennae like that?

  7. #7
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    See reply in #3

  8. #8
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    anyone have some good gain settings on their vector tank preferably vector tank -L ? Talonsix is yours hovering well in 2d+nohold or is it drifting?
    Last edited by dr_patso; 15th August 2014 at 07:42 PM.

  9. #9
    Navigator Beachflyer's Avatar
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    Quote Originally Posted by TalonSix View Post
    This just in.

    15 mins hover time at sea level with the following power combo:
    • TBS 30A Bulletproof ESCs
    • TBS 750kv motors
    • Lumenier 4200mah 4S lipo
    • Graupner 11x5 e-props


    Booya!

    Similar setup.
    The L with:
    3508-16 700Kv SS
    11x4.5 carbon fiber props
    5000 mah Foxtech battery

    Normal flying today and fell out of the sky at 13.5 minutes.
    Calculated 297mah/minute.
    I was bringing it in when the #4 cell decided to go apeshit.
    No damage, went down flat and bounced a couple of times.
    But gives a good estimate of expected flight time.
    I was intentionally trying to push to the 80% usage while watching voltage and mah used.
    Voltage dropped from 13.3 (under load) to 12.6 instantly.
    Checked battery voltage/cell immediately upon landing/crashing.
    3.25 on first 3 and 2.67 on #4.
    After resting a few minutes the #4 got up to 3.13 and the rest were 3.6.
    Hope I can save the battery but the battery puffed a little.
    Balance charging the battery now.
    Even if it comes back to 4.2 per cell I'll still never trust this battery again.

    On the good side the newly installed 1.3 Vtx was flawless.

  10. #10
    Navigator TalonSix's Avatar
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    I had it in loiter mode, but I've found that it drifts a little. Much more so than my Pixhawk Tank. I'll get you my gain settings shortly...

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