The pilot in the experimental amateur-built airplane reported that about 5 minutes after takeoff, he felt air coming into the cockpit from the canopy. He noticed that the canopy latch was not adequately secured and attempted to secure it, but the canopy opened. The airplane became very difficult to control with the canopy open and he made an emergency landing in a cornfield. During landing, the nose wheel collapsed, and the airplane skidded to a stop.
The airplane sustained substantial damage to the fuselage.
The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.