For a B I'd suggest 320kg/hr. the MCTOM is 4800kg (4920 for the B1) so with a dry empty mass (2 pilot) of around 3400kg for a corporate machine, I think your disposable is a bit optimistic. The speed seems a bit pessimistic, still, from what I recall, and I'm not sure what you mean by "50% of MAUW." It's not possible to operate at that weight as it would be 2,400 kg i.e. below the empty weight. One thing the EC155 really excels in is the high altitude cruise - especially compared to the S-76 which becomes Vne limited above 4,000 ft. I regularly saw 165 kts TAS and 275 kg/hr at 8-10,000 ft!
Last edited by 212man; 22nd Aug 2012 at 00:53.