Originally Posted by
NutLoose
Wasn't the V2500 one not the full engine but the cores minus the fan, if memory serves me correctly and would have been three in a triangular layout either side ?
It was my understanding that it was 4 x V2500 - which were each rated at about 25,000Lb of thrust, giving a useful 10,000Lb thrust increase over the Conways and a projected minimum 30% fuel saving.
The V2500 is a little bit bigger than a Conway but not hugely so (it's used on the A320, for example) - I believe that the engine hangers would have had to be re-worked but that it would have been a reasonably straightforward swap (no worse than the CFM56 being fitted to the 707/KC135/E3).