Why a fictional Spearfish delay cannot be timed mechanically

Would a fictional Fairey Spearfish programme suffer the same handling delay as a real aircraft developed under similar conditions?

There is no reliable way to know, because the same-looking design calculation may not produce the same real-world problem.

The same paper calculation can appear sound in two programmes and fail during only one set of trials. A handling problem might reflect a repeated design mistake, a different operating condition, or an issue unique to the real aircraft. Matching dates and requirements do not prove that engineers would encounter the same fault. Without a clear causal chain, the fictional programme cannot be assigned the same delay.