That's the conclusion I've reached. The possibilities were: HA doesn't like to admit he made a mistake - but, why would he keep the thread going? HA is amongst the stupidest people in Britain - but, he manages to use the internet and type in sentences? HA doesn't believe that physics is a "thing" - but, does he strike anyone here as the "healing powers of crystals" type? HA is just winding us up - yeah, reckon so.
Listen up, folks. You have a car. It has a certain CofD. It ain't perfect, but it's good. You make it a wee bit better by forming a ducted hole right through it from front to back, or possibly from the front to the sides. All good so far? Cool. Ok, it's now a teeny bit better - aerodynamically-speaking - than it was before the duct was made.That's good - it's an improvement. Now we fit a small turbine in that duct. That has brought the CofD back to almost what it was before, but not quite - it's still fractionally better than it was before the duct was fitted. So, it's still BETTER than without the duct AND it generates a small amount of leccy TOO. That's a double win-win whammy.