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There are two really big issues with tail mounted powerplants with propellers; weight distribution and Foreign Object Damage. Tail mounted engines move the empty C of G aft. This forces you to put the disposable load with a forward bias to compensate, hence the long forward fuselage necessary to put the loaded C of G in the required range. Of course, when ...


12

You can make a case that this was the original way to build airplanes as the Wright Flyer had a forward elevator and rear-ish mounted props extending off the back of the wings. Other than that there have been many designs to incorporate rear propellors. The Bede BD-5 has a rear prop. Burt rutan built various designs with rear mounted piston engines/props. ...


8

As stated in comments and Dave's answer, it has been done, but I'm guessing you were thinking about mass produced (successful) commercial passenger planes. Here are a couple of reasons: The propellers on a passenger plane need to be quite big, so they would, for clearance reasons, need quite long and thus heavy pylons. Weight in the tail of a plane is ...


2

https://en.wikipedia.org/wiki/Propfan#1970s%E2%80%931980s That Wikipedia page has a good analysis of propfans a.k.a. unducted fans. See the MD80 testbed and reference to various designs (e.g. Boeing 7J7 slated to be the 737 replacement) with rear-mounted propfans. While not coming to fruition evidently it was considered to be a possible alternative to ...


1

Since mounting the engines up high makes them more difficult for mechanics to service and inspect, you would want to have a good reason for putting them there. It sounds like Embraer's reason is sound (and that fact that their entire line and assembly and design process is based on aft-mounted engines). I cannot cite any evidence for this hearsay claim, but....


1

Fuel efficiency is very important for transport bottom line profit, which is why wing mounts are generally seen. A number of ex-passenger liners such as the Boeing 767 are re-purposed as cargo converts. The Embraer concept moves them back for cabin noise mitigation, but rear mounts give back a little efficiency because a father rearward CG shortens the tail ...


1

The folding of the propellers closely resembles ... a weed trimmer! Given sufficient rpm, the blades will point straight out, with any flexing from twisting or bending helping to hold them in place on the hub. Once the blades are spinning fast enough, the effects of gravity are negligible. One may balance the hub/prop by carefully matching the two halves in ...


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