A pilot has died after his ultralight single-seat home-made helicopter crashed in unknown circumstances on a property north west Sydney

The crash site is on the edge of the Windsor Downs nature reserve about 4km from the Richmond RAAF base

A 43-year-old trainee pilot in a Cessna C182 lost control of his machine carrying out a "touch-and-go" at the Batchelor airstrip in the NT and ended up hitting a tree near the end of the runway

Police understand the pilot was caught in a cross wind and finished up clipping several trees before digging the nose wheel in the ground

A microlight pilot sustained a broken arm and was flown to hospital after his machine ended up stalling after take-off at a private airfield east of York in West Australia's Wheatbelt

The 42-year-old pilot was participating in the White Gum Farm Aviation's annual fly-in along with around 40 other aviation enthusiasts when the two-seat machine crashed

Media reports have a Kiwi flying the helicopter that collided with a Piper Cherokee Six over the Hudson River in the USA that has claimed the lives of 6 on board the chopper and 3 in the fixed wing