- limited dynamic range of perhaps 30dB (1000)
- it is easy to saturate a signal (there is no overflow bit)
- oscillations are easy to induce, but once again hard to detect, especially in a circuit in the middle of a calculation chain
- noise gets amplified across the system
Would the surface tension across a film that accurately finds the shortest path between n points be considered a "computation"?
One thing fascinating by "analog computers" is the way they seem to be practically instantaneous regardless of n. That is perhaps part of the efficiency reflected in the article.
If this were true, it would have profound implications. It's probably not true.
There are also conceptual issues that the airflow across a wing is ideally under stable low angles of attack, constant, but during "fun times" which is precisely when you'd want a model instead of a test pilot, the air flow will vary over time (to the general detriment of flying ability...) so what it means to instantly solve a wing is unclear in itself.