Can you point a way to the hucho book? It seems to be spoken of with a lot of reverence here.
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Originally Posted by aerohead
According to Hucho's book,the gap is responsible for up to 20% of the rigs overall air drag and can mean an extra 10% mpg if you can make it go away.
If you 'rob' the airflow and shunt it internally,you will destroy the surrounding flow,precipitate flow separation,and ruin any chance for aft-body modifications to perform,as they are completely dependent on clean laminar onset flow from ahead.
The partial gap-fillers you see on contemporary 18-wheelers are a proven fuel-saver.
Consider that you want only a single collision with the air,not multiple strikes,then allow the air to decelerate while building static pressure,such that when it finally does separate,it's at the highest possible pressure.
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