Please do tell your motor prop setup for the 40km theoretical range
It is not theoritical it has flown that far with other video and modem setups
(not visible here) and i do have many other airplanes that have gone at least 30km out
multiple times, the thing is that the X8 is more efficient hence lower battery weight which is the dominant AUW factor.
It is not a secret i have wrote about it before, it is a Kontronik Tango 45-06
with a 2.5:1 gearbox at 8 cells.
SORRY i forgot to say that the propeller is a Graupner 13x8 or a Aeronaut 12x8 or 13x8 (depends)
The propeller visible is a HobbyKing carbon 13x8 for testing it's efficiency, something
that has not been done yet.
Of course when i fly i issue a NOTAM