1st question: Does size matter 
2nd question what size 6s battery for longer flight times not acro.
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looking good
For longer flight time - you want to look at Li Ion batteries
You need to decide how many amp you need for the type of flying you want to do - one way would be to add weight to your drone to simulate heavier batteries (use the same Lipo) and check how much amp you are using (depends on motors, props, auw,…)
For 10" - it should easily be able to carry 2 x 6S Lion cells (aka 6S1P packs) of the commonly used 21700 cells - around 900g
You can build those batteries yourself and it is quite cheap compare to Lipo too (but they cannot serve the C ratings of Lipos)
I just completed some 6S1P using some Molicell P50B - fairly straight forward tbh.
2 of them give you up to 100A ‘continuous’ draw & 10,000mAh (for 900g)
see below for more info
Thanks @Cedric i will look af this.
I want to fly this one slow and cinematic.
I recalled this one a bit earlier - some more info / input from more experienced members
You have a link? - description points to multiple models.
Most likely yes I would think
Ill check when i get home from work for more info
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hmmm - quite a few things I am not used to see on modern FC’s (only been looking at gear for a couple of years though so not too surprising )
Seems for sure geared towards analog but not sure it means it could not support a modern VTX through a standard UART…
@Steviegeek @stevesb @Yith @ORB_FPV @bmsleight - am I right thinking you guys are familiar with those? Thank you
Thanks Cedric
These OMNIBUS FC’s have been around for a long time, I used some in the old F3 days, they are usually not that well endowed with many UART ports as they come from the era of SBUS control and analogue video
Looking at the photos and the wiring diagram, thanks @BulletDodger , there seems a couple of options for a HD VTX.
Use SBUS for RC control, (ELRS and Crossfire receivers can now be configured for SBUS) and use RX6/TX6 for your HD VTX
SBUS does not give you telemetry to your transmitter you’ll have to rely on the OSD to see what is going on.
Use INAV flight software v8.0.1 which has ‘dead reckoning’ calculation for heading so you don’t need to use a compass, this frees up RX3/TX3 for your HD VTX
You can then use RX6/TX6 for RC control with ELRS or Crossfire, This will give you full telemetry back to your transmitter
HTH
Steve
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Big thanks for the help all of you.
Its going to be a busy weekend.
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more info for you
Cheers pal
Just waiting on the longer cable to arrive for airunit so whilst i was calibrating the gyro on my tripod i gave the motors a little spin up
Had a bit of noise that may need tuning out but although the video makes props look like they spin wrong way all appears good.
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FYI - all FC with a free uart can handle DJI. There are two things that you need to be careful about only imho. One is the milliamps that the FC can handle for the DJI air unit (work around - O4 pro on the main pack, O4 on an external supply, or vbat / 10v if available on the ESC / FC), and the other is the software.
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Managed to sort out original ESC i had bent a connection in a socket.
Works with dji o4 and gives me full OSD.
The props need replacing with naz ones as the ones sent are crap as can be seen in the googles footage.
Have to say for an Ali Express £93 i didnt expect it to take off.
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Didn’t fancy sending it around the garden then 
Take the fence out with that big bugger
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Pmsl
If i could keep it low it would make a fun lawnmower\strimmer.
It lifts off at 10% throttle and sounds like a Chinnock
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