Both were forced to bail out of their aircraft and parachute to safety.

Australian pilot Steve O'Donnell and German pilot Michale Eisele were taken by helicopter to hospital in Canberra, where they were treated for minor injuries.

Mr Eisele was treated for a fractured ankle, while Mr O'Donnell suffered a back injury.

They were both expected to be released from hospital on Sunday afternoon.

Championship spokesman and Gliding Club of Victoria member Sean Young said the incident was being investigated.

“Both pilots bailed out of their aircraft and used their emergency parachutes, which is what they are there for,” he said.

“Both of them were taken to Canberra hospital for treatment.

“They've each taken a heavy fall when they've landed, but fortunately the injuries they have aren't too serious.

“Other competitors in the championships have been informed of what has happened, everyone knows what is going on.”

The accident occurred at roughly 5000 feet late on Saturday afternoon.

Both aircraft were significantly damaged when they hit the ground.

The gliders were on their way to Narromine when they crashed.

Mr Young said it was rare for two gliders to collide in mid-air.

“(They’re rare) considering the thousands of launches and landings we have and the safety procedures in place,” Mr Young said.

“This is why they wear parachutes though, just in case.”

The two pilots and gliders landed within 500 metres of each other.

NSW Police said since no significant injuries were sustained and the incident did not involve commercial aircraft, the investigation would be referred to the Air Safety Bureau.

“Both pilots ejected from their gliders and parachuted to the ground near Yerong Creek,” the police statement said.

“Both were flown to Canberra Hospital by helicopter in a stable condition.

“The matter will now be investigated by the Air Safety Bureau.”

The championships will continue this week.