The pilot reported that during takeoff initial climb, once above the tree line, he felt as though the airplane encountered, "a strong quartering tailwind." The stall warning horn sounded, and the airplane began to descend to the left. He was able to put the airplane's nose down, and the airplane touched down in the grass area that outlined the left side of the runway surface and bounced. He cut the engine's power and the airplane touched down again in the grass area on the left side of the runway and "went onto the nose-wheel and the left main. The pilot applied right rudder and he was able to steer the airplane back onto the runway and stop. The airplane sustained substantial damage to the left wing. The pilot reported that about the time of the accident, the wind at the accident site was calm. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.