Discussion
An aeroplane requires \( 30 \ \mathrm{N} \) of column force per g. Certification for its class demands between \( 12 \) and \( 55 \ \mathrm{N} \) per g. Fitting a bobweight that adds \( 20 \ \mathrm{N} \) per g gives
Answer: D
The bobweight adds directly to the force per g:
\[ 30 + 20 = 50 \ \mathrm{N/g} \]
which is inside the 12 to 55 band, so the aeroplane remains compliant, though with little margin at the heavy end. That narrow margin is itself a design finding: a smaller bobweight would leave more room for the variation with centre of gravity and configuration. A bobweight cannot reduce the force per g, so the third option has the sign wrong, and it certainly does not leave it unchanged.
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