During The Initial Climb, The Airplane Encountered Windshear Analysis: The pilot reported he was attempting to depart from a remote 2,040 ft long airstrip. During the initial climb, the airplane encountered windshear, and the pilot noticed that the vertical speed indicator depicted a decreasing climb rate. The pilot determined that the airplane was unable to out climb the terrain due to the windshear and opted for a straight-ahead forced landing. The airplane landed in a three-point configuration in tall, thick sagebrush and eventually nosed over, coming to rest inverted. Both wings and fuselage sustained substantial damage.