Discussion
Which is true of an unshielded horn balance?
Answer: B
An unshielded horn projects clear of the fixed surface, so it sees the free stream directly: more balance per unit area, but its behaviour changes more with incidence and sideslip, which makes overbalance in a corner of the envelope easier to stumble into. A shielded horn is smoother and weaker. Neither addresses flutter, which needs mass. And both work throughout the speed range, with the usual transonic complications.
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