Space One 220x Pod Prototype Build

By TheHebs3d on Dec 03, 2016

5  1,706  12

This is a build I did for the prototyping of an aero pod for Space One, specifically their 220x frame.

Photos

Discussion

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abella   Feb 09, 2017  

What AWG wire did you run from the FC to the ESC?

TheHebs3d   Feb 09, 2017 

Well I need to update the build photos because its changed a lot since then. I ended up redoing the wiring when I went to individual esc's, and I just used the esc power wires that came with the dys xsd30a's.

EreKeR101   Dec 17, 2016  

Nice build! I'm really liking that canopy of yours. If you don't mind. ..what would you charge for making one for 220? Thanks.

TheHebs3d   Dec 21, 2016 

Im not quite sure yet. I sent space one the first pre production pods last week, and I am waiting to hear back. Space one will be selling them once finalized, and im not quite sure how much he will be charging.

EreKeR101   Dec 21, 2016 

Ok. Thanks for getting back & letting me know on that.

TheHebs3d   Jan 25, 2017 

I should be sending out the first production pods soon. I believe they will come in a kit which will include the pod, tpu battery protectors (top and bottom), tpu motor pads, and possibly tpu stack pads for soft mounting the fc and also mounting the vtx/rx to the stack. I am also working on a version for a recording cam. I will update this post once things are 100%.

Sky   Jan 24, 2017  

Two questions. 1. do you like that ESC 4-in-1? 2. Were you actually able to get the dtfc to fly without soft mounting?

TheHebs3d   Jan 25, 2017 
2

I need to update the photos.

(short story)
1) I fried the 4 in 1 and replaced with dys xsd30a, so no i didnt like the 4 in 1.

2) I am not positive yet (to soggy to test), but I believe I have resolved my dtfc issues with a 35v 1000uF capacitor and soft mounting the FC and motors.

(long story)
I had strange issues with the 4 in 1 esc. I thought maybe it was the dtfc gyro issue, so I tried soft mounting with o rings but it did not resolve my problem.

Here is a video of the odd behavior during bench testing. You can see I first spin the motors with the motors tab in betaflight, and they seem to be fine. I then turn on the taranis and i got very strange behavior.: https://goo.gl/photos/Q8FNGoRADg3dtNTS8

People said it could be normal, to try with props on, but it would start to get off the ground then go nuts (basically what you saw in the above video, but with props...)

Here are a couple pics of the fried esc:
top side: https://goo.gl/photos/knuZGywXyp3aF8mf9
bottom side: https://goo.gl/photos/Twimt7fbWoDubg2NA

I replaced the 4 in 1 with DYS XSD30A's. I soft mounted the motors at this point as well, using some 1mm thick tpu pads I drew up.
Heres an updated pic with the 30a esc's on the arms. (I have since thrown electrical tape around the arm/esc's): https://goo.gl/photos/r6GH9WtxYSoQc8X78
Pic of current stack mounting setup (after removing the 4 in 1 from stack, see below): https://goo.gl/photos/bLvotuqM5wkvg1ky9

During bench testing, it definitely seemed better and I could spin up the motors with the motors tab as well as the taranis. However, I did notice some slight hiccups during mid throttle.

I threw props on and went and tested some LOS in the backyard, and it went pretty terribly. I would hit a certain mid throttle section where the oscillations got so bad that it would get out of control and would crash. Video: https://goo.gl/photos/egTeom5GvSSoVM9n6

I spent some time googling and talking to people on fpvchat slack, and people suggested cutting my P's in half to see if it made an impact. It definitely helped a lot: https://goo.gl/photos/7D99eDHX4mXiUQo97

...however I finally got out to the field last week to test the quad and it still had really bad mid throttle oscillations. Its like it hits this certain frequency and just twitches and oscillates unless I get out of that throttle position/frequency..... and my video feed would also cut out at the same time... I had some friends there that were quite a bit more experienced with the quads than I am and they tried playing with pids etc... and we still couldnt get the oscillations out.

I did a lot more googling, and discussing the issues with other people with dtfc's, and people with other sensitive-gyro'd fc's, and at some point I stumbled upon this section of the betaflight faq: https://github.com/betaflight/betaflight/wiki/Frequently-Asked-Questions#how-do-i-solve-yaw-twitches-or-mid-throttle-oscillations-

It is basically a post from Boris talking about people with dtfc's and other sensitive gyro'd flight controllers having issues when upgraded to newer stronger motors. It is followed by a bunch of stories of people resolving the issue using low ESR capacitors.

Here is an excellent video demonstration of using low ESR capacitors to filter noise:

I ordered some 35v 1000uF capacitors from ebay: http://www.ebay.com/itm/4x-Panasonic-FM-1000uF-35v-Low-ESR-radial-capacitors-caps-105C-12-5mm-12-5x25-/252060958099?hash=item3ab000fd93:g:2moAAOxykUZTft5d

They ended up being HUUUUGE. I couldnt figure out any great way to mount it inside the canopy, so I ran some leads off of the battery pads, through the frame, and under the arm.
https://goo.gl/photos/XKEa7U2sHmSo78E57
https://goo.gl/photos/xH33yu57VGWb1XPm7

It has been too soggy to go out to the field to do a full test, but I did a few mid throttle blips in the back yard the other day and I believe my issues have been resolved (crosses fingers).

I will post an update as soon as I can get it out for a real test (hopefully in the next few days). I will also update the build photo's once I confirm that this is the final setup.

Also, here is an update on the status of the pod design:
I believe the pod itself is finalized and should be shipping out to SpaceOneFPV within the next week or so. There are talks of selling it as a kit, which would include the pod, tpu motor pads, a tpu pad that protects the battery from the standoff screws (see the capacitor pics above), a battery sled for under the battery (to protect, and to give a flat surface to take off from), and possibly a vtx/rx stack mount, and a fc mount.

I am also working on a version with a recording cam mount.

Sky   Jan 25, 2017 

Sounds exactly like my experience with the DTFc. Get a kombini and your problems will all go away. It has a 6000 gyro. Also, my DTFc blew a couple ESCs out as well when I was trying to get it to work. I was sort of hoping you found a magic solution. The capacitors seem to be the first real one I've seen. Here's hoping!

TheHebs3d   Jan 25, 2017 

I will definitely be changing flight controllers if the cap doesnt resolve my issues. I have looked at other fc+pdb combo boards and many of them wouldnt fit well with this pod design due to various reasons like having the battery pads sticking out the side, etc.... However I believe the kombini would actually be perfect.

Whiffles   Dec 03, 2016  
1

Some very detailed build photos, great job!

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