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Te rarely used form of propulsion, the tri-motor aircraft were mostly produced and used in Italy. So let's talk about having them spread more widely, in USA, UK, Germany, SU etc. For the starters, here is how the Wellington might've looked if it was powered by three Bristol Pegasus engines: http://s37.photobucket.com/user/GTwiner/media/More Creations/Triwell.jpg.html