Shortly after takeoff, at approximately 250 ft agl, the pilot experienced a total loss of engine power. The terrain ahead of the aircraft was unsuitable for a landing so the pilot initiated a left turn to land in an adjacent field. During the turn the wing stalled and the aircraft began to sideslip. The pilot was unable to correct this before the aircraft struck the ground. The pilot attributed the sideslip to a combination of low airspeed, the steepness of the turn and a tailwind component. The cause of the engine power loss has not been identified.