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  1. Hi Alex, may want to look closely at CG...

    Hi Alex, may want to look closely at CG placement.

    I'd experienced the "pitch up" phenomenon as well as a "spin-out" on a QAV250 with flip 32 board. I recently built up a carbon Mini-H clone with...
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    You're planning on running the L-tank with...

    You're planning on running the L-tank with extended motor mounts, right? If so, this is way too much motor for the props you'll be running. It looks like this motor is intended to run 6s with 16 in...
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    http://www.ecalc.ch/ Here's the site. There's...

    http://www.ecalc.ch/

    Here's the site. There's a subscription to get the version with all the motors and batteries listed in the library. It takes some learning to figure out what's what, but its...
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    21a is the max current they recommend running...

    21a is the max current they recommend running continuously. That motor with a 12x4 T-motor prop listed in the chart pulls 14A at full throttle (so, fairly safe to use). The acutal max current you get...
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    I haven't run either of those motors, so I can't...

    I haven't run either of those motors, so I can't speak to the build quality or balance. That being said, I've had nothing but good luck with the sunnysky's I've owned, and I've heard very good things...
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    I don't think you'll get to 30 min flight times...

    I don't think you'll get to 30 min flight times with gopro+gimbal and 12" props... even with a dual battery setup. I entered something similar to what Benny is running into ecalc using dual 5200...
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    Great write up Benny. Thanks for sharing. I've...

    Great write up Benny. Thanks for sharing.

    I've been running ESC's in the arms as well on my MK1. So far so good, but haven't flown in any warm temps yet.
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    If you want long flight times and the ability to...

    If you want long flight times and the ability to carry more payload (gimbal, batteries, etc) go with the long arm and big props. If you want more of an all around quad capable of fast flight and...
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    Sticky: Thanks Matt. I'm using 36mm spacers, and they...

    Thanks Matt.

    I'm using 36mm spacers, and they are just tall enough for the 4s 5000s. There's also a trick to installing this size in the frame... I have to slide the battery in diagonally from...
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    Sticky: 55641 Cinetank MK1-L Motors: Sunnysky...

    55641

    Cinetank MK1-L

    Motors: Sunnysky 2216 650kv
    Props: APC 12x6
    ESC: Velotech 20A Stick (located in arms... no issues to date, but I haven't tested in hot weather)
    Flight Controller: APM...
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    Sticky: Yeah, I'd run across the videos in the APM wiki...

    Yeah, I'd run across the videos in the APM wiki and suspected that the videos were yours. Nice flights by the way... looks like I'm asking the right guy for help. Thanks for the tips. I'll work...
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    Sticky: Thanks Josh, This is my first time using APM...

    Thanks Josh,


    This is my first time using APM on quad, and there's a lot to learn here. What seems to have worked best so far for me is to stick with the rate PID's I got by running autotune and...
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    Hi Josh, Very nice build. Congrats! I...

    Hi Josh,


    Very nice build. Congrats!


    I noticed e-calc has a beta for coaxial motor/prop combinations. Wondering if you ran your setup through it to see how the predictions compare to...
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    Sticky: Here's an update... got the gray softer bobbins...

    Here's an update... got the gray softer bobbins from FC. Did some more flying over thanksgiving and still had what I thought was vibration. After watching (and listening) to the recording cam I...
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    Sticky: Thanks for the confirmation. I've seen that the...

    Thanks for the confirmation. I've seen that the black ones are recommended for colder weather. Its going to be below freezing here for the the next 6 mo. Are those the best ones, or do you recommend...
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    Sticky: 54664 Josh, here's what I'd ran in E-Calc....

    54664

    Josh, here's what I'd ran in E-Calc. The auw is really 1780g instead of the 1930 I'd originally posted.

    Below is with the multistar 6600. This battery is about the same size & weight...
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    Sticky: Thanks, I really like this frame design. The...

    Thanks, I really like this frame design. The dirty section is very rigid with a bunch of room in it for electronics. I also like the isolation arrangement better than the screw type bobbins.

    ...
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    Sticky: yeah, I'm in the same boat... I eventually want...

    yeah, I'm in the same boat... I eventually want to run a gimbal and want the alt hold, loiter and GPS hold that APM can do (plus I had a spare APM sitting around from an old plane project). I...
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    Sticky: Thanks Josh, The ecalc looks right. although...

    Thanks Josh,

    The ecalc looks right. although I've normally run the battery condition at full so that its worst case for overall motor power. I also used APC electric E instead of slow fly for the...
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    Sticky: Thanks Kiwi. I'm not certain that the ESCs...

    Thanks Kiwi.

    I'm not certain that the ESCs will work in the arms long term... The ones I'm using are intended to run inside of arms, so I figured I'd give them a try. My main reason for doing...
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    Sticky: Hi All, Just finished building an L tank and...

    Hi All,

    Just finished building an L tank and thought I'd post some pics.

    5462454620546215462254623

    Here are the specs:
    Motors: Sunnysky 2216 650kv
    Props: APC 12x6
    ESC: Velotech 20A...
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    Sticky: Agreed, I haven't tried it, but I see no reason...

    Agreed, I haven't tried it, but I see no reason why it wouldn't work. The motor mounts are symmetric and motor mount screws go in from the underside of each half of the clamshell type mount. You'd...
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    Sticky: I went with 4s mainly because I have quite a few...

    I went with 4s mainly because I have quite a few 3000s and 5000s sitting around from other aircraft. I ran a bunch of simluations in e-calc with pancake style motors, and in cases where they were...
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    Sticky: Yes, I already have the APM sitting around...

    Yes, I already have the APM sitting around without a home. I'll order some 11" props to try based on your advise. Thanks guys.
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    Sticky: Hi all, I just ordered a long arm kit, and will...

    Hi all, I just ordered a long arm kit, and will be putting together a build. My main focus of the build is to get long flight times and good video quality. I'm trying to keep the frame light, so I...
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