He spoke to the specifics of why ice is hazardous. “Ice increases weight, so the wing must compensate with more lift by increasing angle of attack,” he said. “That kills airspeed. Ice on the wing also changes the airfoil’s shape and reduces the wing’s ability to create lift, an issue that demands an even larger angle of attack.” Interactively with the group, the room was reminded that antennas and wheel pants ice up too and that also increases drag. Then there’s ice on the propeller that reduces thrust, not to mention that with ice on the airfoil, that increases the aircraft’s stall speed. He asked the room to offer up a minimum airspeed for a Cirrus in icing conditions that pilots should know about, before the increasing stall speed crosses the line with the decreasing airspeed number. Few had a really good idea.