Originally Posted by
noneofyourbusiness
Bell added a second smaller engine to their version of FARA. The GE engine appears to be too small for the Sikorsky FARA. Sikorsky could lose because the Army forced them to use too small of an engine.
Sikorsky wasn't "...forced to use to small of an an engine" unless you say both competitors were"forced". In the basic RFP it said that the aircraft should be designed to use a single ITE . That was the criteria.
What Bell did was for their APU they used the PW207D1 used in their 429. The innovation for Invictus is that for certain conditions when needed, they designed a way for it to be temporarily coupled to the main transmission for a time. When so coupled the 360 gets an effecive ~20% increase in power available to the rotor. Sort of like the effect of an afterburner.