On arrival in the circuit area, the pilot assessed the wind to be from the south-west at 10 knots. He elected to land downwind, as the strip sloped slightly uphill to the north-east. Touchdown occurred about halfway along the strip, and the pilot was unable to bring the aircraft to a stop in the distance remaining. The aircraft collided with a fence and came to rest 60 metres beyond the end of the strip. The strip was undulating, with the slope in the landing direction varying from 2 up to 1.5 down. The average upslope was in the order of 1 , and the pilot evidently misjudged the effect this slope would have on a landing in downwind conditions. The aircraft crossed the threshold slightly higher than the pilot desired, and it floated for a considerable distance under the influence of the tailwind. After touchdown, the pilot was reluctant to carry out a go-around because of the slope.