One of my latest memorable moments was just the other day in my R22. Depart from home with calm winds, climb to 500ft agl, 25 knot tail wind. Climb another 500 ft, 40 knot tail wind. Climbed to 2000 ft agl, 50 knots on the tail and silky smooth cruising at 140 knots. Dreaming I was in a Gazelle, but could of been a B-47 if I were heading the other direction.