I refined the engine a bit more: removed stack separator and cubic octagonal strut (from the rotor) and replaced them with docking port jr. instead. So its now posible to redock them to the aircraft, preventing phys-load explosions. Also, I´ve build new aircraft, C-27j, 26 tons and max speed of 50m/s https://www.dropbox.com/s/20hxgw9mwwezhi1/C-27 J Mk1.craft?dl=0