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I will have to respectfully disagree. No one is saying the horizontals primary purpose is to produce lift, however I can assure you when real aircraft are built the airfoil on the stabilizer is designed to produce a certian amount of lift be it positive or negitive to react to the c<span style=''font-family: Arial; font-size: 9pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA''>haracteristics </span>of the airplane (usually the main wings design/airfoil). I spent many years in aviation, have a degree in avation technology and was a DC-9 instructor for a major airline for 6 years and have a very good understanding of what I'm talking about.

I think maybe ChuckW is right, this topic would be better suited in the aerodynamics forum.
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You are describing stability. I stand by my statement. There are many of us in RC who have an extensive aviation background. Aeronautical Engineering degree - USAFA 1988. USAF Instructor Pilot. F-16 Pilot.

Kurt