Fan Switch Relay Wiring - NorAire® Heat Pump Boiler Intro - 60 Minutes November 29, 2018 at 9:00am CST Register. Selling Electric Heat - 60 Minutes December 13, 2018 at 9:00am CST. Stall Speed at Clmax=x.xx - This appears only on the in-flight analysis, and only if the wing area and airframe weight were specified for the model. It indicates the range of speeds which are at or below the aircraft's stall speed at the maximum lift coefficient (i.e. the speed below which the aircraft cannot fly)..