I'm getting about 3:30 +/- depending on how whipped the particular pack is. You can get 4:00 but only if you make it less fun... ;-)

thanks! I've got some 4s 850s that I picked up for a build but they were too heavy and killed the flight time so they have just been sitting at storage charge for months. But now I know what I'm doing with them and my extra air unit!

Haha! Very good! :-) Yes, I've had the same happen, some smaller machines top out at the 650mAh packs, but the slightly bigger motors on this build like the 850s. I look forward to seeing your build photos!

thanks for the quick response, I just finished a mockup for it! Happy flying!

You know, I never really did. It's a bit weird, there seems to be something fundamental about the build that is giving me rattle and bounce regardless of what I do. It's not terrible, but it's just not as good as I want it to be. Disappointing.

You know I've got to tell you I'm experiencing the same. I've been banging my head trying to figure out how to get the rattle/jello out. I've replaced and tightened screws, and am still trying to tune it out. Running 4.2 which has improved rpm filters as well. It occurred to me that I didn't secure the air unit to the plate it sits on, so I double side taped it down. I'm hoping that was causing the rattle. Let me know if you find out anything.

So figured out my problem. Motor 2 needed to be replaced. Did a quick test fllght and jello seemed gone. Need to get in more packs tomorrow to confirm

Oooohhh... How interesting. So you have spurred me to go out and have another go at getting this to fly. I too thought it was something gross-level mechanical, that the antennas were oscillating at certain speeds, so I printed a brace for the antennas, but that made no difference. I wonder if the frame has a resonant frequency or something, and when you get to that throttle level, it all starts to shake itself to pieces? It seems a bit unlikely though.
Anyhow, I went back to my videos, and it looks like the most recent changes I made, raising the PID sliders back up, have made it fly worse than it was; more shake at high throttle. So that says software to me, maybe software exacerbating a physical issue, but software all the same, and that should mean it can be made better. So I've dropped the sliders down again, raised the TPA values a bit (I might fiddle with that a good deal more as it sort of feels like TPA should help here), have RPM filtering on, and semi-randomly have reversed my motor directions, so it's now props-out. It looks like the weather is turning wet again, but hopefully I can get out with a pile of batteries and a laptop before it does, and see if I can make any more progress.
I shall indeed let you know what my findings, if any, are!

Well, that's definitely a possibility for me too, I guess... Still, the motors seem fine at lower throttle for me. But good, glad you are sorted!

I say try starting from stock again with rpm filters enabled but not slid over yet. Dynamic notch adjusted though. I would imagine its a hardware issue that you just haven't pinpointed yet over a tuning one. If you can try to blackbox your gyro data and see where you filters are hitting. Maybe its missing something.

So the weather has really turned against me, but I did manage to do a couple of quick tests yesterday and I have got the thing flying better. Somewhere between dropping the master multiplier down to Low, the PD Balance and the P and D Gain down down one notch, upping the TPA and swapping the motor direction, I appear to have got rid of the gross-level oscillations at high throttle. And have made it fly the best that it has flown so far. I did wonder if I had a dodgy gyro, but I actually think it was the tune after all.

I mean we're practically running the same setup. Only difference is I'm using power hungry 1408 4100kv XING motors. I'm getting 2-3min of flight time on a 650mah 4S Tattu R-line. I run this stack is most of my builds and I've had a couple dodgy gyros. Try changing the Gyro setting from both to first, do a pack, then to second, then do a pack. See if there's a better gyro and run with that. Or get the FC replaced by iFlight, they're usually pretty good about it.

I've actually made really good progress in the last few days. Props-out seems to have helped a great deal, I've got a much better tune going on with the BF sliders, RPM filtering engaged. And the tics I was seeing on the gyro have gone away. I'm still seeing some dodgy prop-wash handling from time-to-time, but overall it's now flying way better. I'm getting 4 1/2 mins out of 850mAh R-Line 4S, and it's extremely snappy. Much happier now, I mean, it's a sweet little frame, really don't want to waste that! :-)

HI, funny thing , props out uses a different strategy to do yaw , some say its better ,but who knows, I know little about 3in rigs , but as a general rule if i have issues with p wash i prop down a little, , the 3052s may be a little too much for the motors to handle. . Cute little rig .
Cheers

Glad to hear it's back in action. I've only used 650mah R-line 4S on it. I need to find a longer strap to try the 850mah out. 3min run itmes are too short. I'll give props out a shot – doing that with my 3" Gecko and it's working well. I was able to reduce my propwash quite a bit with turning Vbat Compensation on, bumping up the I term a bit, and increasing D-gain by about 5. That and with the filter sliders pretty far to the right. Also running 4.2 on it and it's muuch smoother.

Yes, reverseing the props definitely did something helpful. I see a lot of 3" and 2.5" pre-built machines with reversed props, so I suppose that there is something about prop direction and small machines? Dunno. But happy it helped. And yes, I did put on less agressive props, but that was before the motor reverse thing and so I was still having other issue. I should do more tests now!

Without battery it clocks in at 238g, a little heavier than I would really have liked, but with that canopy and Air Unit, what can you expect? And yes, it flies nicely below about 2/3 throttle, but then devolves into a mass of ticks, bumps and oscillations at any higher throttle. I am going to need to spend some time in a field with a laptop I suspect.

That was expected. the DJI modules are not meant to get incredients for a 3" setup. To prevent overheating they are using a lot of aluminium which crashes effective weight points. I´m sure next year around that time they promote a module with the same functionalities but on half of the weight. That´s how business works ;-) But thanks for answering. I like your built.

Yes, trying to squeeze this tech into a 3" machine is asking for a bit much, to be honest... :-) I competely agree with your prediction, I absolutely expect the release of an Air Unit v2.0, and that it will be much smaller, hopefully a 30x30 footprint to better squeeze into more standard frames. And thank you,it came out nicely, and just today I set it up for RPM filtering, and that has made a lot of difference, it was flying so much better this morning. RPM filtering, unexpectedly impressive!

Well, THAT didn't take as long as I was expecting: http://www.multirotorguide.com/news/caddx-vista-vtx-for-dji-digital-fpv-system/ And DJI licensing this tech too? That's very interesting.

nice finding! but from a business point of view this is the next step how to collect the customers money. Thanks for sharing...