I like the idea of those plastic covers on the side to guard the stack from debris. I fly props out, and have never had a problem with it, but a little extra protection is always good.

I wish my GeprC Mark4 HD5 frame had those.

Soooo... I got me that sweet V2 frame and some new motors. The frame is very affordable and has a few improvements:

• slightly wider arms at the base
  
• thicker bottom plate
  
• titanium camera protector with M3 screws
  
• yellow plastic parts
  

The T-Motor F60 Pro IV 1750 KV motors on the other hand are not cheap at all, but I really wanted to know how they compare to the Toka's.

Soldering the motors the way Diatone did it was a bit complicated since they are soldered to the bottom of the ESC. I had to put the wires through the protectors first, cut them at the right length to make a nice curve under the ESC, and solder everything upside down. Only then I could stick the protectors on the arms and screw down the motors. If I had to do it again, I think I'd simply solder the wires to the  top pads on the ESC.

I never really liked the camera mount on my V1 frame because it was fragile and would flop forward too easily. I figured out a new way with zipties on the bottom and a modification in the back to get the angle I want. This also created a strip which protects the battery. It's simple and works great.



I did a few test flights to find the right amount of filtering and to find the right PID tune. The first flight was a disaster because I had very little filtering (and disabled the dynamic notch filter) and one of my arm screws was a bit loose, resulting in a massive amount of vibrations which was noticeable within seconds after take-off. I landed immediately to check the motors and found that they were really hot...

After checking all screws and re-enabling the dynamic notch filter, it flew just fine. I could disable the gyro lowpass filters like before and I was hoping it wouldn't need any fixed notch filter like the V1 frame, but it turns out that it resonates at the exact same frequency, so I ended up adding the same 215 Hz (190 Hz cutoff) notch. I also kept the D-Term lowpass filter slider at 1.8 just like before.

For the PID tuning I followed Chris Rosser's process (https://youtu.be/WoxDbIbpP_Q?t=1) where you increase the Master slider first to find the maximum D values, after that you search the best PD balance and FeedForward gain. I ended up with the Master slider at 1.7, PD balance 0.8 and FeedForward at 1.2, which is comparable to what I used before, except for a higher I-term because we're using the Master slider instead of the PD gain slider.



Here's a short bit of tuning flight in full analog glory:



Now, do I recommend throwing out your V1 frame and Toka motors? Not at all... The frame does not perform any better regarding resonance, and is only slightly stronger. The motors are only a tiny bit faster and I doubt I'd be able to distinguish them in a blind test (see this: https://youtu.be/pEAsEqeC2S8?t=1). The Toka's are really good and I think it makes more sense to get the 1800 KV version if you're looking for a little more punch.

I'm done upgrading and tuning, off to get some stick time now

(02-Jul-2021, 07:12 PM)hyperion Wrote: Can't thanks you enough, L0stB1t!  Will try these setting and post some Blackbox soon.  The ESC seems to have failed on my unit so I'm working with Diatone on a fix but as soon as I'm up I'll share what I'm seeing.  I'm also getting a set of the Gemfans you like so the comparison will be as close as we can given the differences with V2 and the DJI system.

I am really digging on the Rosser videos.  I'm optimistic that once the Roma is set up right it will be clean enough to disable the slider filters completely like he does.  And with 4.3 seems like this will be even more possible.  Exciting stuff!

Really looking forward to getting this dialed in.  The quad has fallen out of the sky many times due to de-syncs and other issues and I haven't broken anything.  That's a great sign of longevity...

Thanks!  -hyp

Did you ever figure out your problem with the desync issues ? when I had the 6s version I was going through the same thing. Sometimes when I did a punch out the quadcopter would just quit, I still had video but it would just stay level and Drop Like a Rock but now I have the 4S version and I don't have a single problem.

Did you ever figure out what that noise was because all three of my Roma's have this sound that comes and goes that I only hear it if I put it in angle mode and I'm at Low throttle just kind of flying by. I thought I had got some kind of debris in one of my Motors but I've completely clean them out and I still hear it I don't know if it's the same thing you're talking about but it's on all three of mine, have it have 6s and a 4S version.analog and dji version. I just fly it cuz I don't hear it unless I'm coming in the land and I can hear it go in and out.

(04-Aug-2021, 08:04 PM)Chipster75 Wrote: Did you ever figure out your problem with the desync issues ? when I had the 6s version I was going through the same thing. Sometimes when I did a punch out the quadcopter would just quit, I still had video but it would just stay level and Drop Like a Rock but now I have the 4S version and I don't have a single problem.

Sorry for the late reply...I sent the original quad back to China and got a replacement!  Which then promptly desync'd in maiden flights.  I was pretty despondent, but got up on the UAV Tech Discord and some of the guys there walked me through some changes which has addressed the situation, or at least allowed me to fly and tune.  The changes were:

* 24 -> 48 kHz on motors -- maybe a little loss of power, but at 6S this thing is a monster either way
* 11 -> 23 deg on timing
* 6 -> 8 on idle RPM

I'm slowly walking the idle back down to 6, we'll see if I can get there.  There's also a 30Hz resonance on the frame, this might be the DJI antennas.  I also set the gyro filtering to be more in line with Chris Rosser's approach, but again it's early days and I'm no where near as deep into the tuning as L0stB1t.  But hope to get there.

For comparison, I'm also building up an AOS 5.5 just to get a sense of the difference between the two approaches.  Will share what I learn over the next few weeks...

-ch

Hello friends. I have problem with my roma f5. After arm i'm tring to increase throttle to 100%, but drone increaese throttle only after some wooble. Tpa, idle throttle, dinamic rpm throttle, some changes on esc setup, doesnot have affect. 

But this happens not all time, sometimes its doesnt happen

This is my dvr




This is BB log of the first wooble

https://prnt.sc/1qjfgje

(26-Aug-2021, 09:08 AM)flexo Wrote: Hello friends. I have problem with my roma f5. After arm i'm tring to increase throttle to 100%, but drone increaese throttle only after some wooble. Tpa, idle throttle, dinamic rpm throttle, some changes on esc setup, doesnot have affect. 

But this happens not all time, sometimes its doesnt happen

Hi flexo, welcome to the forum!

That's really weird behavior, there's something wrong with motor 1 or its ESC. Are the motor wires still clean and well attached to the ESC? Also check if the motor windings are ok and not touching the motor screws. Make sure no wires or antennas can hit the props.

I noticed you're also getting a lot of battery sag and some low battery warnings. Maybe this is related? Are you using good quality batteries? Is the ESC capacitor still attached correctly?

If it's just a desync, try changing the BLHeli config to Ramup Power 25%, Demag Compensation High and Motor Timing Auto.

Hey @flexo, great to see another owner on the group.

I had this same exact issue with my first F5 V2 from Diatone. Would hesitate on throttle punch, kind of roll to one side, recover, and then ramp out. I tried just about everything I could to address the issue including three different versions of BF. I became convinced that it was a hardware issue...I wish I could have debugged it further but I just returned the quad and replaced it with another one. The new one did not have this issue. I know this is not a very precise answer and will require a lot of long shipping times.

(This is probably the best argument for having 2-3 quads...it gives you something to fly while you obsessively refresh shipping trackers...)

It's worth trying all the stuff that L0stB1t suggested. Be aware that the 32.8 BLHeli_32 has some known issues and if the Mamba ESC is temperamental you'll want to stay with conservative settings. As a last resort you can also try stock BF settings which are decent for 5" quads or try Mark's presets which are also good. But if the ESC is bad or the gryo is broken there's nothing the software can really do to fix that.

https://theuavtech.com/presets/

FWIW the BB log link above didn't work for me.

(26-Aug-2021, 09:08 AM)flexo Wrote: Hello friends. I have problem with my roma f5. After arm i'm tring to increase throttle to 100%, but drone increaese throttle only after some wooble. Tpa, idle throttle, dinamic rpm throttle, some changes on esc setup, doesnot have affect. 

But this happens not all time, sometimes its doesnt happen

This is my dvr




This is BB log of the first wooble

https://prnt.sc/1qjfgje

That is strange indeed.

Its very unlikely to do anything with PID. You are not moving sticks anywhere.. just going up.

It feels like mechanical issue to me. But, Ive seen shorted screw on winding or bad FET, or bad timings. This is quite different.

Only reason why quad would move:
1. Sticks moved
2. RC link micro fail safe
3. FC thinks quad moved - electrical noise or bad gyro
4. Motors somehow lost power.. rubbing.. and its compensating.

Is anything touching your gyro?

No nothing toched my gyro. Few days ago I changed my FC to new from HGLRC, but problem is stay.  Motor is new (bougth new version staut from steele), Fc is new, i think it's broken esc.

From log I can see rssi always stable, but something strange in amperage graph. Looks like power drop for a moment but motor keep spinnig 

https://prnt.sc/1qyya2x - thats setup for log viewr


link for full log - thats a full latest flight log

(01-Sep-2021, 06:42 PM)flexo Wrote: ... i think it's broken esc.

From log I can see rssi always stable, but something strange in amperage graph. Looks like power drop for a moment but motor keep spinnig

Something is wrong with motor 3 or its ESC (and not motor 1 like I thought first).

I don't think the amperage is a cause but a result of the problem. Right at 7.490 seconds in the log, motor 3 probably loses thrust and as a result the quad rolls left and pitches up, which you can see in the gyro's. To fight this unwanted movement, the PIDs and mixer have no other choice but to lower the command to the other motors, since the command for motor 3 is already at 100%. Because motor 3 isn't doing any actual work and the other motors command is lowered, the amp draw also drops significantly.

Since you already got new motors we can rule out there's something wrong with them.

I also noticed that the command to motor 3 is generally the highest in all of your punch-outs and moves, so it seems ESC 3 is struggling all the time. So yes, replacing the ESC is probably the best move.

I am struggling with the de-sync issue of my roma f5 v2/6s. Is there a known fix for this problem? Diatone support wants me to do following things: "Please dont change our tune And reflash fc and reload our tuning". Will it really help? Is it possible to check if the ESC is defect or FC has a problem?

I don't know how to continue, maybe I simply have to avoid this brand in the future?

Here one of the terrible flights https://t.me/fpvfootage/169

(02-Jan-2022, 06:02 PM)swiss-fpv-pilot Wrote: I am struggling with the de-sync issue of my roma f5 v2/6s. Is there a known fix for this problem? Diatone support wants me to do following thinks: "Please dont change our tune And reflash fc and reload our tuning". Will it really help? Is it possible to check if the ESC is defect or FC has a problem?

I don't know how to continue, maybe I simply have to avoid this brand in the future?

Here one of the terrible flights https://t.me/fpvfootage/169

Yeah.  You gotta 100% disregard their advice on this.  I still have no idea why they use those defaults with their setup, but assuming the ESC isn't broken, here are the parameters I'm using and the quad flies absolutely great:

Version 32.7 or 32.8.2
PWM freq: 48k
Timing: 23deg
High DM
10% Ramp Up

Hope this helps,

-hyp

Sorry, this is definitely the wrong place, but I have to place my opinion and experience with Diatone somewhere they can not simply delete it. Diatone is removing negative comments about they products from they website without any comment. It is "no-go". Diatone is dead for me. https://www.diatone.us/collections/roma-...-4s-6s-pnp