Discussion
Consider the following pairs of sizing case and the surface it governs:
Engine failure at low speed - Vertical tail
Trim at the forward centre of gravity limit - Horizontal tail
Crosswind landing - Vertical tail
Cruise trim drag - Vertical tail
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are correct. Engine failure at low speed and crosswind landing both size the vertical tail, and trim at the forward centre of gravity limit sizes the horizontal tail - that being the condition demanding the largest download.
The fourth is wrong on the surface named. Cruise trim drag is a horizontal tail matter, arising from the download the tailplane carries and the extra wing lift it forces; the fin carries no trim load in symmetric flight and contributes nothing to it.
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