The absolute absurdity of the efficiency of propellers

So, somehow, an engine giving out a maximum measily 19Kw of power, is enough to keep a 2.22 ton complete brick of an airplane at an altitude of 28.5 km (higher than the SR-71, whilst mind you the atmosphere of droo isnt as high as the earths). Additionally, this plane here is able to maintain a mach number of like 0.94 at sea level. This is NO cheats. Additionally, it can pull upwards of 119G's without the wings snapping, like come on, this isnt even possible. With optimisation from vizzy, i can get a propeller craft to circumnavigate droo MULTIPLE times, whilst jets can barely do it twice. Now mind you, i couldnt be bothered to do this, i have another aircraft that i made that can do it around 3.6 times (with maths). I wouldn't care that much, but Kw and Horsepower are directly related, 19Kw = 25 horsepower. 25 horsepower isnt enough to get this brick to FLY let alone maintain this altitude, and i am using, ZERO cheats of any kind. This is mathematically disobeying the conservation of energy. i think that the strength of wings and the efficiency of most propellers (ESPECIALLY the drone one it is the MOST overpowered of the bunch)
But feel free to ask questions, as i cant really do much in this bug report, but i will show you how i got the proppellers to be so efficient without tinker panel, but later