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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. Maryland. The information regarding V-22 ext and CH-53E ext is estimated in accordance with the following methodology. Effective Cruise SpeedAn aircraft carrying an external load would go out at external-load cruise speed and return at internal cruise speed. Thus, the mission time for the out and in legs is 
The effective round-trip cruise speed, then, is round-trip distance divided by mission time: 
Or 
''External No-load Distance"As discussed above, the rotary-wing aircraft no-load distance for internal loads is the maximum round-trip distance. A "no-load distance for external loads" can be defined as the extrapolation, to zero load, of a linear fit to data for finite loads. These data and extrapolations can vary for different types of external loads, but this is ignored here. An approximate value of an "external no-load distance" can be obtained by assuming that the hourly fuel consumption rates, and so the times of flight for internal and external loads, are about the same.2 Then the "external no-load distance" = (external no-load time of flight ≈ internal no-load time of flight) x (effective external cruise speed).
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