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Home✈️AircraftMulti-Rotore-Multi-Rotor Main DiscussionOther › My Scratch Built 1000mm Hex
05-11-2013 07:14 AM  6 years ago
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95nostalgia

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My Scratch Built 1000mm Hex
Didn't take many pics during build. Trust me. It was just a bunch of fiberglass sawdust.

Seems I could never find what I wanted. Some folded but weren't so strong. Some with little clearance between plates. Others too expensive. Most had to be modifed quite a bit to accomodate accessories. So I reluctantly planned a custoim build. No rocket science. Just quality components (I hope) that work together well (I hope).

Avoided carbon fiber except for 1" arms. Didn't want the RX issues or "chippyness" of CF. Used G10 FR4 for plates. Landing gear was store-bought but had to modify top to attach to hub.

Major parts attached. No matter how hard you plan, it gradually gets more and more cramped as the build progresses.

When I look at a multi-build, I look at the power distribution first. Never found what I wanted so I had to make it. 10 circuits (2 inputs and 8 outputs) tied all together. Should be capable of 250amps throughout. As always, the limiting factor is the wiring or connectors anyway.

Spaghetti bowl. PDB in place.

Preview of things to come. Used clear dome to size up components. Black one will be the final. Machining a slightly larger battery holder where they are sitting now and some knurled knobs so hub can be quickly detached from landing gear. This gear is for payload. Second gear will be low profile and more like a helicopter for casual flying without load.

With the Hex loosely assembled with all of the components, I could finally get an accurate flying weight without payload...12.6lbs. That is plus 2lbs heavier than my DJI S800 flying weight.
God created only a few perfect heads...the rest he put hair on them.
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05-11-2013 09:17 AM  6 years ago
FunkieChicken99

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Very nice job!Kenneth.... Fly Safe!
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05-11-2013 01:26 PM  6 years ago
Dr.Tim

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"O" My! ALLEN !! You Need to send me a "SAMPLE" To test for you! My Testing takes only 3 to 25 years to complete. At the end of the testing I will let you know if there is anything to be updated. LOVE IT!! You really did a nice job.From Simple minds come simple ideas! Approach Engineering
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05-11-2013 05:27 PM  6 years ago
95nostalgia

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Hex
Thanks Heli/Multi Dudes. You are too kind to this humble servant. Doc...how'd you know I was looking for a road tester? And we both know you could test it REAL good ! Ha.

FYI, all the complaining about the DJI S800 and gimbals etc. I just 3M'd a GoPro on the bottom of my S800 and shot my first videos. No gimbal. No stabilization. Flew as steady as I could in 20mph gusts and was really surprised at the quality. No jello. No vibrations. Just a bit of roll here and there (my bad). Just so happened it was my 75th flawless flight. All about 15min each. Maybe I just got a good one? Maybe it's because I never break it down or mishandle it? Who knows.
God created only a few perfect heads...the rest he put hair on them.
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05-11-2013 10:22 PM  6 years ago
Mojave

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looks good Allen!
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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05-12-2013 01:40 AM  6 years ago
95nostalgia

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Hex
Not as good as a big ol R22...ha. Emphasis on the "big ol".
God created only a few perfect heads...the rest he put hair on them.
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05-23-2013 07:11 AM  6 years ago
95nostalgia

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Hex Maiden and Impressions
Have 4-5 flights now and thought to comment on what I am learning.

1.General flight characteristics. It flies (ha). It's big. Does what it's supposed to do as far as controls. Feels a bit too tight when I move it and it snaps back to level flight. Seems to have a small amt. of mid-stick "dead band" where I have to move the throttle more up/down in that area. But when it responds, it moves.

2.WKM parameters. Still a work in progress. I started with higher than suggested DJI settings for an unloaded S800 since this MR is bigger and 2# heavier. No oscillations but gut tells me I could cut back some on the values.

3.Anomily #1. On one startup, I noticed one motor studdering and like it was trying to rotate. I backed off the throttle and started again. All was fine. I am watching it closely. Could be anything from WKM to Motor. Tiger 4014-11 (330kv) motors, Maytech Opto 40a SimonK, WKM.

4.Anomily #2. With prior WKM assistant (not sure of firmware version) on my S800 (now gone), when I toggled the IOC switch to mark/verify my "home position" before takeoff, it flashed green. With this WKM and latest firmware, it flashes green followed by same pattern that is BLUE. Is this a new thing? According to DJI manual, blue flashes means "Firmware upgrade has finished. Waiting for reboot."

5.Future test. My initial flights were disappointingly shorter. But flight time increased with each flight. Braking in? Today I flew for 10min but extrapolated for 80% battery usage. I culd get approx. 19min out of two 5800mah 6S batts. That is impressive for such a big bird. I will conduct more flights using these Tiger CF 5.5 props (well made) and then switch to Graupner 14x8's to get data.

As time permits, I hope to share more on this build as this is where the learning and sharing gets good. 1000mm is a big bird and harder to move around. But with size comes stability and this thing is STABLE. Have tested in some pretty sudden and variable gusts of 20-30mph. Barely a tilt !!! I tried my old S800 back to back. Couldn't control it. But be aware. Big usually means heavy too. And what goes up.....
God created only a few perfect heads...the rest he put hair on them.
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05-23-2013 05:02 PM  6 years ago
HansAuf

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Gainesville, Florida, USA

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Love the power dist. Fantastic, clean, design.
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05-23-2013 05:32 PM  6 years ago
GyroFreak

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Orlando Florida ...28N 81W

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Incredible job. I too love your distribution module.
I had a similar camera mount and landing struts but found it was somewhat unstable and easily breaks on crash landings (I know, not supposed to do that, but it happens). I switched to "Peg Legs" which give a tremendous stability (no tipover in strong winds) and are very rugged.
They are spread so my balls don't get in the view of the AP picture.
.
You can see my previous setup in my gallery.
.
EDIT: After looking at my picture I decided to remove the outside left and right landing pegs, save some weight.
It is always in a state of modification/change.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?
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05-23-2013 10:38 PM  6 years ago
95nostalgia

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LG
Hans...PDB working well so far after 4ea 10min test flights.

Gyro...I was gonna suggest removing those legs. Nice job. Looks good. A change to see some silver instead of black. Bergen does orange (or whatever you want I suspect).

It's mighty warm today in Texas and my motors and ESC's (edge of hub) are pretty warm after 10min of hovering. Not hot but my S800 never got much above ambient. I don;t like hot electronics. Backed off of parameters in hopes of removing "tightness" in level response. Estimate with the Tiger props that I can get 14-15 inutes flight time @ 80% batt use (11,600mah). Likely to change as breakin continues and I exper. with other props.
God created only a few perfect heads...the rest he put hair on them.
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05-28-2013 07:27 AM  6 years ago
95nostalgia

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Tiger Motor Stall?
I guess you call this a motor "stall" but where is what I have. Two motors (M1 and M5) seem to not rotate on startup. They jiggle and try to move but can't. Only has happened to one motor at a time but has happened at least 6 diff. startups now and then. When I let the motors die or I manually stop them and restart, they always start up properly. But you can imagine...it's got me scared a bit for such a large machine.

Upon dealer recommendation, I adjusted the WKM assistant motor odel speed from "recommend" to "high" with no change. I am using Tiger 4014-11 (330kv), Maytech 40a opto SimonK, WKM, Tiger 15.5 props.
God created only a few perfect heads...the rest he put hair on them.
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05-28-2013 03:42 PM  6 years ago
Chris Bergen

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cassopolis, MI USA

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When you begin to raise the throttle, do the motors then start up?

I have seen similar on my setups, but going to a higher idle setting has always cured it. If the motors go ahead and spin up with an increase in throttle, you're probably just fine in flight.

I think the issues lies in the low voltage going to the motors when you CSC the sticks, it's simply not enough for those 2 particular motors to spin them up. When you increase throttle, they get a bit higher voltage and go ahead and spool up.
Chris D. Bergen
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05-28-2013 04:13 PM  6 years ago
HansAuf

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Just curious. Did you calibrate the ESC's throttle travel one at a time, or with a signal splitter, or other means?
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05-28-2013 08:31 PM  6 years ago
95nostalgia

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Startup
Yes. Calibrated the throttle for each motor by itself hooked directly to the RX only before final installation.

Raised the motor idle speed in assistant from "recommend" to "high" and didn't change anything.

I have been told this is a common thing. Seems the DUI WKM startup pulse is just weak. One supplier swaps motor/esc combos until he gets results. On Hex I believe the possible motor/esc combos is 720 combinations. That's a lot of swapping.

All in all I think it is a toy-like controller that is weak enough to create compatibility issues with others brands.
God created only a few perfect heads...the rest he put hair on them.
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05-28-2013 08:35 PM  6 years ago
95nostalgia

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Startup
Chris, sorry...NO. When I raise throttle further, the motor does not response. I have to let software shut motors off or I manually shut them down and restart. Then they start up.

Is it possible that a motor can be resting in a certain spot (magnets and winding alignment) where it is just not wanting to start? Seems that would be about either the magnet strength to pull it into starting or the controller's signal strength.
God created only a few perfect heads...the rest he put hair on them.
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05-29-2013 02:20 PM  6 years ago
Dr.Tim

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I have a motor not starting until just before takeoff, then it comes to life! Been doing that from time to time now for over a year ..From Simple minds come simple ideas! Approach Engineering
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05-29-2013 02:31 PM  6 years ago
Chris Bergen

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cassopolis, MI USA

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Where are your throttle ATV's/ endpoints?

Possibly if you recalibrate each ESC with ATV's at 150% may cure the issue.

I believe it to be more of an ESC issue than something in the DJI, the simple fact that SOME of your legs are arming leads me to ESC or Motor.
Chris D. Bergen
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05-29-2013 05:46 PM  6 years ago
Dr.Tim

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Moved the endpoints to 140 and the issues seams to be cured ... Thanks Chris!From Simple minds come simple ideas! Approach Engineering
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05-29-2013 08:55 PM  6 years ago
95nostalgia

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Stalls
Chris, thanks for the suggestion. Will put it on the "list" to try. I would tend to think esc/motor as well but keep in mind that IF a pulse signal is so weak that it is that marginal, it could be random or even jump around from channel to channel. Just not enuff data yet on my end. But I am listening to your results. Unfortunately my radio has a display glitch and had to ship it back so I will be delayed a bit in testing. I am working with a person who has had this same issues with many combos over the years and I hope to have more definitive data.

Doc, what rig, controller, esc, motor? Can you give us longer term results from your endpoint changes or are you confident enuff to call it a definite fix now?
God created only a few perfect heads...the rest he put hair on them.
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05-29-2013 11:40 PM  6 years ago
Dr.Tim

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My endpoints were at 120 .. after moving them up to 140 the "LAZY" motor issue on start up went away! .. Going to call it a Fix .. Avroto Motors on a 650mm Hex ...From Simple minds come simple ideas! Approach Engineering
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