[Big Dave]

I always wondered if Phil's hood treatment was doing any good. It has been an article of faith that the rear is more important than the front.

The smoke tells the tale.

The hood slope reduces the vertical wind velocity at the windshield and helps maintain the smooth flow over the top until it can engage the bed cover (I don't think what's on Phil's bed can be called an 'aerocap' in the way us mortals know the word).