I am trying to get my mind around concept of Velocity verses Static Pressure in simple terms. Using a hovercraft as our topic model, I understand that high static pressure is desired for the lift system, and high velocity for the thrust system. Therefore it's nice two have two systems one for lift, one for thrust. Here is where I get a little fuzzy, the case of a strong headwind. In a strong headwind more air enters the propeller or thrust fan at a faster rate, right? I'm not sure that is correct, just asking, and I don't know if it’s all that critical to my final question. The question is; In a strong head wind is it more desirable to have velocity or static pressure coming out of the tail of your thrust unit? The reason I am asking is that I think that not only does a strong head wind reduce you "ground speed", it creates a head of resistance which velocity is ill suited to contend with and overcome, and that static pressure is well suited to deal with it and push back. What head wind creates is more than just resistance and drag, it changes the character of the fluid medium we call air. Boats never run into "thick" or "dense" water do they? I would assume water is more predictable than air to design for. Please help straighten my head out on this one, I have run into some real life experience on the topic, trying to paste experience and theory together this time. NOTE: I am not an engineer, I am an architect. Please try to keep it simple for me, examples and pictures will help, charts and diagrams will not help as much.