Hi Francois,
Yes, back in UAE, this time in Abu Dhabi working for a government-owned company building a new UAV helicopter. Progress got delayed over a month while I was recovering from COVID 19, but I'm back in the office for the last week.
I hope the cooling system works out for you. The only way I could get electric fans to work was on the SVU-200 UAV helicopter by having two BAF's (Big-Ass Fans), one to pull the air in and force it up through the radiator, and another on the other side to pull it through the radiator, and I needed a shroud to use 100% of the radiator surface. It would never work here in the UAE, but it worked well on normal days in China. I first used two 24V electric fans to pull through the radiator in the Mini-500, both even ran off a separate dedicated generator, and with both side panels off and I still could not run 5 minutes at hover power without overheating, and that was with a Rotax 582.