Stunt legend Robbie Maddison has performed motorcycle backflips from a ramp suspended under a helicopter nearly 5,000 feet in the air!
Motorcycle record-breaker Alex Harvill has died after crashing during a 150-foot practice jump at Grant County Airport
The Aussie daredevil is filmed flying down a bobsleigh run shortly before leaping down the jump
The 37-year-old Aussie sends it while making a promo video for Red Bull Knock Out 2018
And it took two years to work.