[Jukka Juutinen]

BTW, I do not insist on tech background, but I do insist on understanding e.g. the difference between a mechanical supercharger and a turbocharger or the difference between supercharger stages and speeds. There a plenty of authors out there who understand neither. E.g. Paul Ludwig, the author of the Classic book on the Mustang, has either failed to understand a simple supercharger drawing or has not bothered even to check his cra* (his Merlin description is a catastrophe and will result in some folks being convinced by his lies).