Looking at the Meredith effect (incidentally, can't see why antifreeze makes any difference to the effect - and what about Evans!) I don't know why they wrote it as they did, but I'd make a guess that they knew about the fascinating and important history of cooling the Merlin in the Spitfire, and were thinking about evaporative cooling not beng used eventually. Typical current for a small cooling fan is 5A, say 60W, so maybe 100 to 200W for the whole circuit from alternator to fan. I can't find the the power needed to run an alternator (not the current generated), but it must be trivial compared to that needed to support typical electrical loads, and the system is very inefficient. Not powering the cooling fan or spinning the alternator will release some power that can get to the wheels, but avoiding electrical loads on the alternator is probably much more important. 2. Switch on the cooling fan. I don't understand this: more please. If you run your 7 with the cooling fan running (regardless of temperature), given that some/much/most of the air exits through the bonnet louvres, would that create any thrust effect? Nope. The power is too low and the airflow too disorganised. Getting any significant ram effect from the cooling system is very complicated. But has it been used in eg F1? Jonathan