Testing The Theory
Now back in the day, there were no computer simulation models to test theories with. No, engineers in those days had to make model prototypes. Before testing with these prototypes, it was impossible to know whether the theories would hold together in the air.
Between 1953 and 1957, nine prototypes of the Avro Arrow were constructed. They were perfect imitations of the hoped-for real thing, except that they were made to a smaller scale.