For the purposes of discussion, let me start with a square loop. There is a 20kt wind from left to right and I start from the left at 20kts and pull straight up directly iin front of me. I maintain a straight line and slow to 20 kts at the top where I turn into the wind, lose 5 kts and continue at 15 kts plus the added wind speed of 20kt for an air speed of 35kts. I proceed to the down ward turn and dive straight down while chopping the throttle to a speed of 20kts. At the bottom of the leg I pull level, lose 0kts because gravity helped in keeping the speed up in the turn and proceed at 20kts minus the wind speed of 20kts coming from behind for a net air speed of 0kts and hope I can accelerate to a flying air speed before Ihit the ground. Reverse the flying direction and Istart from the right at 20kts and pull up maintaining a straight line and slow to a speed of 20 kts and at the top I turn with the wind, lose 5kts in the turn and end up at 15kts minus the wind speed of 20kts resulting in an air speed of -5kts and hope I can gain enough speed on the way down to avoid hitting the ground.

Rounding up a loop can result in similar results.

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