Shipping container-launched cargo rocket promises 550-pound deliveries 750 km away in 15 minutes — $1.25M Air Force contract backs ‘Rook’ cargo rocket that flies into space to speed deliveries

Hop Aero, a six-person Y Combinator startup based in Orange, California, has published the first public details of what it calls ‘Rook,’ an autonomous rocket the company says will carry 550 pounds (250 kg) of cargo up to 750 km in about 15 minutes, launch from a standard 40-foot shipping container, and land on unprepared ground with no runway or fixed infrastructure. The company’s Y Combinator listing gives Okinawa to Taiwan as the reference mission for that 15-minute flight and pitches Rook as a way to put swarms of autonomous unmanned systems on a battlefield. However, Rook hasn’t flown yet, and Hop Aero’s only government funding is a single $1.25 million Air Force contract that expires in October.

A minimum-energy ballistic arc covering 750 km needs roughly 2.64 km/s at burnout and peaks near 181 km, by some quick napkin math, which puts Rook well above the 100 km Kármán line into space. The ballistic coast alone accounts for about six-to-seven minutes, leaving around eight of the claimed 15 minutes for boost, reentry, and landing. A 40-foot ISO container offers about 12.03 m of internal length and 2.35 m of width, capping the vehicle’s dimensions. Rocket Lab’s Electron stands 18 m tall and delivers about 300 kg to low Earth orbit.