TS,
Directly behind the rear pilot's area in the X2 are the force generators.
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The tilt rotors put less complex transmissions on the wings and free up the entire fuselage for useful load.
The
AeroVantage puts the PropRotors fore & aft and frees up the entire area for downwash.
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The devil made me do it, 'cause I don't have a large marketing budget. 
Dave