The Rans Coyote II was taking off from a Gloucestershire grass strip with pilot and passenger aboard. There was a light crosswind from the left and the grass was damp. It accelerated normally and at approximately 42mph IAS the pilot rotated, but as the aircraft lifted off he felt it lose momentum and turn markedly left over a ploughed field. He applied full right rudder to turn back towards the runway but as he did so the right wing dropped and the wingtip hit the ground. The aircraft came to rest on the left side of the runway and was substantially damaged by fire. Pilot and passenger suffered minor injuries. The pilot believes that the engine suffered a power loss during rotation that led to the left wing stalling, and subsequently his application of right rudder then caused the right wing to stall. Due to fire damage it was not possible to determine why the engine lost power. The AAIB notes that the Coyote II was approximately 4% above its MTOW which ‘would have reduced the stall margin, giving the pilot very little time to react to any loss of power’.