For a teardrop shape, which orientation has the least drag? Here's the shape:



(Well, that's a cross section of the shape. The actual object is a 3D shape obtained by rotating that outline around the y-axis.)

Let's pretend it's a solid, rigid object flying through the air. It can fly point-first or curve-first. Which way produces the least drag?

Assume it's normal air at room temperature. The angle of attack will be constant. It will be subsonic speeds.

BTW, is there a huge difference in drag? If not then it doesn't matter much.
The design looks similar to the wheel fairings found on many Cessna-type aircraft. They lead curve-first. 

If it was going tip-first, you could have a nice laminar airflow initially, but once it reaches the curve, the airflow will separate from the surface and produce a big wake with associated drag. By leading with the curve you can have a laminar flow right to the tip, with only a little bit of drag.