Where do i even start… so… as you know… there are planes with 3 engines… some like the dc-10 or md-11 go through the tail, but others like the b727 or yak-42 or l-1011 go through the tail as an s-duct, BUT THE THING IS, THE S-DUCT TRIJETARE WEIRD! BECAUSE THE TAIL ENGINE LOOKS LIKE AN INLET WITHOUT THE SPINNING BLADES! BUT THE ONES THAT GO THROUGH THE TAIL HAVE SPINNING BLADES, THEY ARE JUST FARTHER BACK IN THE ENGINE BUT ARE VISIBLE! THE S-DUCK ONES THAT GO THROUGH THE TAIL ARE LITERALY INLETS WITHOUT SPINNING BLADES! THERE NOT EVEN VISIBLE! I need you to tell me in comments how this works otherwise im saying that the yak-42 or b727 or l-1011 are just 2 engine planes with an inlet in the tail to hepl the 2 engines. BTW this is TWA flight 266 improved.