Originally Posted by
kenparry
Hooker did not design the Merlin supercharger, as is clear in the book that you quote. However, he did improve it hugely, leading to much higher power output from the engine.
Not that it matters and I was quoting from memory but I said he designed the
impeller of the supercharger; as I recollect, he applied stuff he had learned in his degree. If you would prefer, he improved the design of the impeller of the supercharger.