RB7ate9 wrote:forty-two wrote:Just a little thought RE the apparent slot/vent on the nose hump, has anyone considered the aero characteristics of hollow point ammunition?
Such ammo might appear to have the aero characteristics of a house brick, but is actually pretty good. The trick apparently is that the area directly in front of the hollow point forms a sort of bubble of high pressure air, which is what then encounters the oncoming air first, making the effective nose of the projectile a rounded ball, which has much better aero.
Or am I way off the mark here?
My first thought, exactly. Similar notion to rear spoilers and keeping a truck's tailgate up.
A stagnation point is really just a point where airflow in a stream is said to be zero relative to the surface its flowing over. This zero velocity point and it is just a point that has a higher local pressure that the surrounding freestream. Its position is controlled by the shape of the obstruction. SO in this case it woul be positioned around ahead of the overhang and at around 30degrees below the horizon of the radius of the curve of the overhang
Of course if there is an opening then the stagnation point is aligned more to the radius of the "overhang"
Its net effect will be to set up a wedge that would approximate a straight line tangent to the overhang and stagnation point and intersect the top surface of the nose