Was taken on a quick "tour" of this bus in DRW on its way down to Avalon.
Fairly specialised freighter as the cargo 'deck' is unpressurised. The upper deck is simply a single skin over the ribs and stringers. Flight deck is the only pressurised area. Amazing to stand inside and see that it fitted all three choppers plus a half length demountable with room to spare, particularly headroom. The choppers were basically the same size as two blackhawks and one apache. Huge!
All that drag means that it cruises about mach 0.68 to 0.70.
Couldn't get too much extra detail from the crew due to my very poor Francais!