The revolutionary ''aircraft'' was seen being worked on about 1.30pm.
The Otago Daily Times understands the jetpack was tested about 4am yesterday but it was ''commercially sensitive'' and the public was not supposed to have seen it.
When contacted, Martin Jetpack chief executive and managing director Peter Coker said it was the company's ''new aircraft'' and ''one of its flight tests requires a nil wind environment.''
The covered stadium was a ''good'' place to test it, he added.
He could not confirm what time the testing happened or how long the jetpack would be in Dunedin.
Dunedin Venues Management Limited chief executive Terry Davies did not want to comment and Dunedin City Council environmental health team leader Ros MacGill said there had been no noise complaints yesterday.
Developed by Christchurch's Glenn Martin, the jetpack made its first public flight at a US air show in 2008.
It was limited to a height of 1m.
The 200kg machine can reportedly reach a speed of 74kmh and fly to a height of 3000 feet.
