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When the angle of attack is increased to between 18 and 20 degrees (critical angle of attack) on most airfoils, the airstream can no longer follow the upper curvature of the wing because of the excessive change in direction. The airfoil will stall if the critical angle of attack is exceeded. The airspeed at which stall occurs will be determined by weight and load factor, but the stall angle of attack is the same.

Stall speed increases in proportion to the square root of the load factor. Thus, with a load factor of 4, an aircraft will stall at a speed which is double the normal stall speed.Answer (B) is incorrect because an airplane's tendency to spin does not relate to an increase in load factors. Answer (C) is incorrect because an airplane's stability determines its controllability.

The airfoil will stall if the critical angle of attack is exceeded.Answer (A) is incorrect because while exceeding the maximum allowable operating weight could compromise the structural integrity and decrease controllability, it does not necessarily result in a stall. Answer (B) is incorrect because while the remote pilot may not fly faster than 87 knots (100 mph) or the manufacturer recommended maximum speed, exceeding these do not necessarily result in a stall.

Any mounted equipment should be balanced in a manner that does not adversely affect the CG or result in unsafe performance.

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.