Hunter Jones, secretary of the Australian Sports Rotorcraft Association (ASRA), confirmed a crash investigation had begun and a report would be done for a coronial inquest.
He said: "No details will be released until that report is formalised.
"Our condolences go to the families of everyone concerned."
Mr Jones told APNZ that the pilot, Mr La Bruna, was "an industry colleague" who was "meticulous in everything he did, including his approach to flying and instructing.
He said: "Sam was very experienced and so it came as a huge shock to the Australian gyro industry."
Mr Jones also revealed that Mr Brockbank had come to his attention earlier this month.
"It is rather ironic that Robert actually purchased a publication from us a couple of weeks ago: a book on gyro flying. It was a transaction that went through our online shop. It's very sad."
In a death notice in The New Zealand Herald today, Mr Brockbank's family mourned his passing.
The notice says: "He lived a full and adventurous life and died while embarking enthusiastically on a new found passion. Sadly missed. RIP."
Stanley Yeong, who was waiting to take the next lesson, told The Sunday Age newspaper that he became worried when the gyroplane failed to return to the "very windy" airfield after two hours.
"They were only supposed to be gone for one hour. I started trying to call them but I couldn't get through. I'm shocked. [The pilot] was very experienced - he loved to fly," he said.
Local police Sergeant Rocky Fazzolari was reported in The Sunday Age as saying: "It's been very windy and gusty - it may have contributed, who knows."
But Mr Jones, a gyroplane expert, doubted whether high winds played a part in the crash.
He said: "I wasn't there, so I wasn't aware of the conditions or the circumstances, but by the nature of its design and mode of flight, gyro is considerably more stable in wind than fixed-wing aircraft. It is able to withstand fairly high winds, of 20-plus knots."
