At 1745 Central daylight time, the airplane collided with trees and the ground while maneuvering on initial climb. Visual conditions prevailed; the airplane was destroyed. The Private pilot and one passenger were fatally injured. A witness observed the airplane departing from Runway 1. After departure the airplane went into a fairly quick climbing turn. The climb appeared to get steeper and the bank angle got steep and then it started going down. The left wing dropped down and the nose of the airplane pitched down. Another witness heard the airplane collide with the ground.