The pilot reported that, before takeoff, he was adjusting the radios and forgot to latch the canopy. After takeoff, the canopy "shimmied open about 2 ft aft." The pilot reported that he immediately reached for the canopy with his left hand while his right hand was on the control stick. The airplane was a few feet above the runway surface when he applied slight forward pressure on the control stick, but the airplane's nose pitched down, and the nose landing gear impacted the ground. The airplane veered right, the main landing gear collapsed, and the airplane then slid to a stop on the runway. The pilot reported that he did not complete the predeparture checklist to secure the canopy because he was adjusting the recently installed radio and headset. The airplane sustained substantial damage to the left wing. The pilot reported that there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.