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I can understand the architecture of your argumentation but 15% less consumption at cruise on one engine means that roughly max power available is 2*1/0.85 cruise requirements (2.3).If we look at the curve below we can see that a rotarywings aircraft can go as fast as the powertrain needed for stationary flight allows them to go.Moreover, cruise speed is generally defined for a turbine powered aircraft as a high fraction of the maximum speed that the craft can go (I will let the why of that for a further discussion).Here, the large excess of available power simply illustrates, either that no better engine was available in that power band (doubtful), either that the slow speed regime need much more power than the high speed regime can make of it.This is not what efficiency dictates...[ATTACH=full]673980[/ATTACH]
I can understand the architecture of your argumentation but 15% less consumption at cruise on one engine means that roughly max power available is 2*1/0.85 cruise requirements (2.3).
If we look at the curve below we can see that a rotarywings aircraft can go as fast as the powertrain needed for stationary flight allows them to go.
Moreover, cruise speed is generally defined for a turbine powered aircraft as a high fraction of the maximum speed that the craft can go (I will let the why of that for a further discussion).
Here, the large excess of available power simply illustrates, either that no better engine was available in that power band (doubtful), either that the slow speed regime need much more power than the high speed regime can make of it.
This is not what efficiency dictates...
[ATTACH=full]673980[/ATTACH]
