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I thought these were IAE engines on the a318 at first but it turns out they are the new PW6000. This is new to me as I though the a320 series only carried the IAE and CFM engines. here is a Video of the new PW6000 in action http://www.youtube.com/watch?v=Opuhp0a2zdo
It's not really new, actually. In fact, PW6000 is the launch engine for the A318. Unfortunately, PW6000 wasn't working as it was promised for, being 6% fuel-thirstier than it was planned for (As written on Airliners World Indonesia, 6th Edition July 2010). So, the first 3 customers (Frontier, Air France, and Mexicana) selected CFM56 instead. AFAIK, only LAN, RAK Airways, and TAROM that ordered PW6000 (the A318-121 version).
IIRC, PW6000 is having lots of difference to its V2500 counterpart. Even if they are build on the hands of PW (IAE is owned by PW @ +/- 35% stakes), PW6000 is lighter than IAE V2500. And, maybe, the High pressure turbine is different, since V2500 is PW tech, and PW6000 is MTU Aero's tech.
seems a bit weird to me :S , If PW wanted to make those most profits I would say they should have just stuk with the one division. Afterall... whats the benefits of the PW6000 anyway, If you say its worse on fuel then it seems a no brainer to me
PW & A320 family operators are surely going to love Airbus if the V2500 was hanged on those A318, but the story told you something more. V2500 is too heavy for that little minibus. If V2500 was hanged there, the A318 won't become the Regional Jet like what Airbus wanted, due to extra weight (however, Airbus did failed on this thing anyway, due to the size and weight that is still beyond RJ).