Rick Durden's December 2014 complex article about tailplane icing was well researched and well written. It also proved prophetic. At Cincinnati Municipal while my L-39 was being fueled, Bill Rieke, an icing researcher, came over to chat. He said that he thought the L-39 would be particularly susceptible to tailplane icing and stall because of the smallness of tailplane, the thinness of the airfoil and the need for ventral VGs. The following day I was returning home VFR on top at FL190 where the sky was clear and the tailwinds good. Eventually, though, the clouds rose above me and I began to pick up very light rime on the canopy. The wing looked clear.
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