No. It looks like everything transferred in fine.
Havenāt had a chance to look at the log but the video looks great!
Pitt,
I looked at your log and you still have some oscillatory stuff going on in the background but I think the higher I gains with the non-zero ILMI have gone a long way to helping keep the attitude tracking the target. So if you want you could back off a little on the P gains to remove the oscillations and if you feel it isnāt snappy enough then add some VFF instead. These settings are more along the lines of what I learned from @ChrisOlsonās tuning. With this setup I would not recommend using acro or sport mode or any mode that is rate command in nature. If you want to explore the use of the notch to increase the P gain, you can. It is up to you.
Havenāt flashed the new firmware yet.
I might move to 3.5 altogether.
I donāt feel like using those anyway but would like to know the reason.
How about loiter or auto?
This tuning should work fine with loiter and auto since they are all attitude command based. Another reason for backing off on P gain a little is that the loiter and auto modes may be more likely to excite the instability frequencies. So that is why I recommended bringing up VFF if you arenāt getting the response you need after lowering the P gain.
Before I flip the switch to loiā¦alt-hold first?
What other tuning/parameter check will I need?
In my opinion, the low P gain values would not provide sufficient damping and unless you are an experienced pilot that is good at flying lightly damped heli. The other thing is that I think the high I gain would make the aircraft lag quite a bit behind your inputs. If you have ILMI = 0 it might be a little better. I played a little with these settings when I started with arducopter last year. I did not like acro with my settings which was P gains around 0.06 and I gain around 0.1. I had not D gain and VFF was around 0.6 if I remember correctly.
I might have a chance to go to an open field this week. Can you help me set up for Alt-hold and loiter?
Iām still using CH8 passthrough for throttle which shouldnāt work but I canāt find a proper guide for that.
I might not be the right man for that since I havenāt flown heliās autonomously. Iāve flown multiās but not heliās. I think the big thing that you have to look at is the ACCEL_Z_P value to be around 0.3 or less. I think that is the biggest concern.
Forgot to update 
Had a successful Loiter. 12mins = 3.76V/cell
Log: https://www.dropbox.com/s/b7akxqsbquuhhoa/2017-06-29%2014-58-44.bin?dl=0
Now trying to mount a camera 
Also found this 420mm blades interesting http://www.mscomposit.net/CFC-main-blades-42-cm-6-3-d66.htm with 6mm root, It fits my 6.5mm grip. However, Iām not confident my rotor can spin it safely, the grips and spindles should be fine but 6mm mainshafts and M2.5 spindle screws worry me.
Tapping M3 maybe possible but a step up to 8mm mainshafts will need a lot of work.
Is it safe to stay with 6mm mainshafts?
Thatās really neat. Love that machine.
Pitt,
What size rotor system was your design based on? Iām assuming that the rotor hub, shaft and blades were all based off of the same rotor design. It sounds like you are going to longer blades? I would base the decision of your shaft diameter more on the weight of the helicopter than the size of the blades. I say that because the shaft is primarily transferring the rotor moments into the aircraft. I think for most 3D helis that are turned into UAVs, the shafts are way overdesigned because the sizes are more based off of loads in 3D aerobatic flight. The angular rates/accelerations are much higher in 3D flight and put more strain on the shafts for the same weight helicopter.
Take @Chrisolson or @timbaconheli, they are running 700/800 size helis at nearly double the design weight with the extra fuel/batteries and camera gear and I believe that is acceptable because they arenāt doing 3D aerobatics. Even my X3 is nearly double the weight of its original design.
The other thing to remember is that you have two rotors, so each rotor is only imparting half the required moment to accelerate the aircraft.
I might be more concerned with the blade grip bolts. I would think they are design more for a centrifugal force based off of blade mass and rotor speed. so I wouldnāt exceed the maximum mass* rotor speed^2 value for the original design of rotor system with your new setup.
Just my thoughts.
Initially, it was designed based on 360 sized helis (Gaui X3) and some from Goblin 380 since anything above 380mm jump to 10mm root thickness.
The Gaui X3 stretched to 380 is common so no problem for now.
However, the grip is larger because I need to use 6mm endmill to make it. It is as beefy as Goblin380ās with same size bearings (5x10x4) which means the spindle is also the same diameter.
So the grip and spindle donāt worry me, 2 points Iām worried are mainshaft (6mm) and spindle bolt(M2.5).
To give you the idea, Goblin380 uses 8mm hollow mainshaft & M4 spindle bolt and Trex500 uses 8mm mainshaft(7mm at OWB) & M3 bolt.
Also the blades I found has 6mm root instead of 10mm of usual 425mm blades.
So my real question is: can 6mm mainshaft handle 420mm blades? (6mm root, not 10mm)
Everything else should be fine
About your X3, do you mean the EurocopterX3-shaped-heli you showed me earlier?
I go back to my previous post. if half of your full up weight for the intermeshing design is roughly the same as the weight of a 360 size Gaui X3, then I would say youāre probably ok, especially if the Gaui X3 was designed as a 3D heli. As far as the spindle bolt, I would not exceed the value of blade mass * (rotor speed)^2 for the maximum size rotor blade and rotorspeed for Gaui X3 heli. Really centrifugal force is based on inertia*(rotor speed)^2 but I think since all we can figure out is mass, that will work. It just assumes mass is distributed the same between the 380 and 420 size blades.
Yes.
Itās about the same without payload (2.1kg ~ 2 Gaui X3s)
If I put anything(camera) on it, it will be off this range.
Someone at Helifreak just told me Gaui made M3 threaded version, so this is no longer a concern 
How much will the payload increase the weight 50% (i.e. aircraft increases from 2.1 kg to 3.1 kg). I would still feel this is acceptable. Iām running a 550 size frame (~6 lbs designed takeoff weight) and increased the weight to 13 lbs. I havenāt changed the main shaft (10 mm) but I went from a 2 bladed head with 600mm blades to a 4 bladed head with 550 mm blades. A main shaft of 6 mm does sound a bit thin. If it isnāt too much work, it wouldnāt be a bad idea to increase to 8 mm. But I think it would be ok at 6 mm. Youāll just need to hold back on the 3D aerobatics 
I tried mounting my custom made gimbal + SZ100 which weight about 900g (close to 50%) and it does fly although at 65~70% stick. Headspeed can not be increased much further, itās already equal to Protos380 RPM for sport flying.
Also found ALZRCās 420mm blades with 5mm thickness, but Switch-brand blades manufacturer said that 5mm root is pushing the safety limit. But still, thatās for 3D helis 
No longer feel like doing that 
BTW Iām curious, your X3 should still suffer from RBS, shouldnāt it?
I had a quick look and EurocopterX3 beat Sikorsky X2ās speed(on paper), how does Xā¦cubed? deal with RBS?
I would think the root was designed more so for the centrifugal loads than bending since the gās due to centrifugal force would be much greater than the bending loads. So it would be more of a rotor speed thing but Iām not certain about that.
Yes the X3 would definitely still suffer from RBS however you can delay it somewhat because 1) you are not using the rotor for propulsive force and 2) you can offload the rotor thrust by using a stub wing. In both cases, you effectively lower the blade AOA over the entire disk which allows the aircraft to get to higher speeds than a conventional helicopter but eventually you will still see RBS.
New blades arrived
My attemp to tap the spindle to M3 thread failed, need harder tap 
However using simple centrifugal force formula, Iām still quite safe since itās 6mm thick (lighter).
Can you share me a copy of design drawings of the synchropter? I want to make one .