Guys why are you assuming the engine is going to come from the likes of RR or Safran ? A gas turbine isn't difficult to make cheaply. I should know as my next door neighbour used to make the compressor wheels for RR if you knew what they cost to make and the mark up Rolls put on them ( way over a factor of 10 ) you would understand the complete laugh the manufacturers are having. Please don't go down the R and R costs t the manufacturer,the Allison 250 was paid for by the US mil in the 1960's the current RR350 and 500 are basically the same engine !