Good question. The thing I realised about a 7" is not to build it or use it as a freestyle drone. Use bi blade props in my opinion. Also @Steviegeek is having great success on 4s2p li-ions. Much better than my 6s lipo.
Mine is currently awaiting a Hdzero upgrade.
I tried some presets on betaflight, they were ok, but not brilliant. However, the inav stock I used (only tested once) was fine. I moved the gps above the hd cam at the front, intstead of the back under the antennas. Pos hold works good.
I guess the biggest recommendation I could give is build it for li-ions.
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Is that purely for increased flight time?
Hmmm, ok I hadnāt seriously considered Li-Ions. I was mainly looking at 2000ish mah 6S batts. Thatāll give me something to think about, cheers. Iām not sure I have the kit or motivation to build my own batteries here.
HI,
Iāve had a few carbon fibre plates break which I was able to get re-cut in the UK (frames came from USA) Iām not convinced it is the 7" strongest frame. If it breaks again Iāll replace with either the Chris Rosser AOS or Falcon FPV frames.
Mine is running ArduCopter and Iām very pleased with it. It suits a 7" quad and lets me fly 2-3KM out with great height control, GPS position hold is rock solid and RTH works great for when I need it.
Iām still on tri-blade props, 7x3.5x3, @notveryprettyboy has moved to bi-blade which he prefers, as he knows how to fly much better than I, Iād take his advice (Iāll be trying them as well soon)
I originally fitted the de-facto Brother Hobby Avenger V2 2507, 1750KV but after a couple of replacements moved over to EMAX ECO II 2807 1700KV which have been very reliable, on 4S. Itās not my only quad on these ECO II range motors and for the price are excellent, seem very well made.
Iām on Crossfire, all my kit is, canāt be bothered / see no reason, to change 
With the new LR telemetry receiver just come out, and being on ArduPilot, Iām looking forward to running some long flights using Mission Planner on the laptop 
As Karl @notveryprettyboy has said I run mine on a 4S2P Li-ion 18650 homemade pack (Sony/Murata VCT6 cells) 6,000mAHr weighing just 400gm.
You canāt pull as much current out of it as you can a 120C 5200mAHr Li-Po but for a ācruiserā it is just fine. At our last Willington Towers meetup I was battling really hard against a strong wind to get back and the pack was just warm when it landed. I try and keep it within 60A.
Keep us in the loop on what you decide, I like 7"ers 
Steve
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Some nice chunky 6mm 7" TBS Source One arms arrived today.
Thatās the extent of my build at the moment. Iāll order the main frame in the next week or so. Main thing I need to find is 4 decent motors in stock somewhere. If anyone sees any EMAX 2807sā¦ Or I could get the Brother Hobby Avenger 2507 which seem to be in stock at the mo.
Hmmm, 4s vs 6? And the 2507s come in a million different speeds.
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OK, seems 1300kv is the way to go with a 6S battery on 7" props.
These T-Motor units look pretty good. More expensive than EMAXs, obvs, but not tooooo bad.
Right, I must do some work and not spend all afternoon looking at drone parts!
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T-Motors are always a cut above anybdy elses in performance and the build quality is superb 
+
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Yeah. But my plane has priority. So maybe another 1 watt vtx from another manufacturer. Cost of living is going up. Times are hard 
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@SirGunner has a 1.2W VTX 
Yeah, I heard he sold out man. Sold out 
I think one mistake I made was getting 2507 motors instead of the bigger 28xx. Mine is ok on bi blades with a 6s lipo, but sloppy. Its ok on tri blades, but the flight time is, iād say, 2/3.
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That answers that question then. I was looking at some of the new Xing 250x motors which are described as being ideal for 7" long range quads, but theyāre only about 80p cheaper per motor than the T-Motor 280x.
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I used zing 2307 on a few of my quads and can say they are cracking motors. If the 250x are anything like them then theyāre worth getting
