This Liquid Hydrogen UAV Just Flew for Two Days Straight
In 2009, the Office of Naval Research’s super-endurance drone, the Ion Tiger, flew for a record 23 hours, 17 minutes—the longest ever for a fuel cell-powered UAV. But late last week, the ONR demolished its own record with a 48-plus hour foray into the great blue yonder. The original Ion Tiger relied on hydrogen compressed…
