The one made by Sky Rocket that`s in the new Sky Viper:
This is about where Tridge shows the size of the controller board.
Many of the flight controllers typically associated with Betaflight, iNav, etc, can be flashed to arducopter. I use a Kakute F7 all-in-one...but there are many others. All these are FAR smaller and lighter and integrated than the Pixhawk world. A quick calculation for me is that I saved 175 grams using the Kakute F7 as opposed to a Pixhawk, OSD, power sensor, telemetry, etc etc.
she was really unstable with the stock ArduCopter PIDs.
Thomas Butler said:
I wonder what caused the frying of the 4-in-1?
I fried also once a 4in1. Since then I use an additional capacitor on the power inlet pads 1000uF. Especiall if using 6S the voltage Spikes can destroy the esc. Never had issues afterwards. There are a lot of informations available in youtube i.e. from „drone mash“ about that issue. https://www.youtube.com/watch?v=xLRBl-2egpo
Take a look at the solder joints of those capacitors;cracked. Perhaps the mfgr owes you a refund! Looks like they are trying to hide that defect with HOT MELT GLUE! Pictures on their web site show solder defects too.