I wouldn't know for sure either but I can guess that that number may be reasonable as far as the amount of HP comsumed but for a different reason. Remember the Blackhawk has the TR canted so as to produce lift as well in some cases so it may cost a bit more power but it should convert some to lift as well as just anti torque. The speedhawk may be able to do the same if it is vectored downward too I suppose but then it would be subject to the same requirement of total thrust. I'm sure Nick wil be along soon to set us straight.
Max