While power settings vary some, depending upon the Cirrus model, full throttle on takeoff should produce about 29 inches of manifold pressure while spinning the propeller at 2,700 rpm. As the pilot retards the throttle and depending upon the position of the cam, the prop begins to automatically slow, but will not drop below 2,500 at high-power settings. The behavior of the prop governor at reduced power is, however, exactly the same as with a conventional prop control set at 2,500. Once manifold pressure drops low enough that the propeller can’t maintain 2,500, the rpm will, of course, begin to decline. On the Cirrus, as power is increased from idle to maximum, the pilot will feel a slight bump through the handle as the power lever moves past the three-quarter point. This confirms the propeller has begun to move above the 2,500 rpm stop.