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Total range is dependent on both fuel available and specific range. When range and economy of operation are the principle goals, the remote pilot must ensure that the sUAS is operated at the recommended long-range cruise condition. By this procedure, the sUAS will be capable of its maximum design-operating radius, or can achieve lesser flight distances with a maximum of fuel reserve at the destination.

The most critical conditions of launch performance are the result of some combination of high gross weight, altitude, temperature, and unfavorable wind. In all cases, the remote pilot must make an accurate prediction of takeoff distance from the performance data of the POH, regardless of the runway available, and strive for polished, professional launch procedures.

The manufacturer is the best source of performance data and information, if available.

Without a GPS or manufacturer performance data, you can determine speed by timing the ground speed of the sUAS when it is flown between two or more fixed points, taking into account wind speed and direction between each point, then noting the power settings of the sUAS to operate at or less than 87 knots ground speed. This is a form of dead reckoning.Answer (B) is incorrect because pilotage will help with navigating the Sectional Chart but cannot be used to determine ground speed. Answer (C) is incorrect because the wind triangle requires that you know true airspeed to determine ground speed; without instrumentation installed on the sUAS you won't have that information.

Operation with the CG outside the approved limits results in control difficulty.