The Private Pilot Licence holder was undergoing type endorsement training. During the third landing, on runway 29 Left, the aircraft commenced to swing to the right. The pilot in command reported that after checking that there were no obstructions he allowed the swing to continue. The student pilot was unable to stop the swing and as the aircraft turned through 40 degrees it began to skid, with the result that the landing gear folded. The aircraft is fitted with a tailskid but no brakes, and was unable to use the normal unsealed landing area as that area was wet and out of service. At the time of the landing the wind conditions resulted in a quartering tailwind from the right at five knots.