The Navy has looked at a fighter-sized drone that takes off standing on its tail, and decided to put more money on the table. On 8 October 2026, Shield AI announced that the U.S. Navy had executed a $150 million modification to its agreement for X-BAT, the company's AI-piloted vertical take-off combat jet, and that Shield AI would match it with $150 million of its own.

Add the $50 million each side committed in August, and the public and private money behind X-BAT now totals $400 million. That is a serious bet on an aircraft that has not flown yet, and the first full-scale prototype is due to roll out this month.

Where the $150 million comes from

The new money is a modification to the Navy's existing Other Transaction agreement with Shield AI. It comes from the Office of the Under Secretary of War for Acquisition and Sustainment, through its Defense Exportability Features programme, which funds work to make U.S. systems suitable for sale to allies. Shield AI is putting in the same amount again from its own capital.

It builds on a smaller step taken in August, when the Department of the Navy's rapid capabilities office and the Defense Innovation Unit announced a $50 million action under RIMES, the effort to give combatant commanders long-range strike aircraft that do not need a runway, which Shield AI matched with $50 million of private money.

Shield AI says the team, which includes GE Aerospace, has already completed engine light-off and integration of the thrust-vectoring nozzle, and validated the aerodynamics of the weapons bay in low- and high-speed wind-tunnel testing. About 500 engineers are working on the flight-test aircraft, and the company's Hivemind software serves as the AI pilot, built for operations where GPS and communications are jammed or denied.

A tail-sitting fighter for small decks

X-BAT is roughly fighter-sized and takes off and lands vertically from a tail-sitting position. According to TWZ, it is powered by a General Electric F110, the engine family used in many F-16s and the F-15EX, fitted with an axisymmetric vectoring exhaust nozzle that provides pitch and yaw control, while bleed air through wing thrusters handles roll. TWZ reports a maximum range of 2,000 nautical miles and a service ceiling of about 50,000 feet.

Internally, the weapons bays are roughly the size of the F-35's, and two plumbed external hardpoints can carry drop tanks or buddy refuelling stores. The pitch to the Navy is simple: an aircraft that needs no catapult, no arresting wire and very little deck can be flown off far more ships than today's carrier jets.

The timeline is aggressive

Speaking to TWZ, Harris said the first full-scale prototype, with the outer mould line, the F110 engine and the full propulsion path installed, would be finished at the end of October. Flight testing, including vertical take-off and landing trials, is due to begin before the end of 2026. Shield AI's goals are a fully missionised X-BAT flight in 2028 and series production in 2029, the same year Harris pointed to for early operational capability under RIMES. The Navy itself had not confirmed its exact plans.

How many could the Navy eventually want? Harris declined to give a number, but told TWZ the scale could be hundreds to low thousands. That is a long way from a prototype that has yet to leave the ground, and every ambitious drone programme has learned that the first flight is the easy part.

Shield AI's look inside the engineering and testing milestones on the way to X-BAT's first flight.

Still, $400 million and a 2026 first flight is not a slide deck any more. By Christmas, if Shield AI keeps to its word, a fighter-sized drone will be standing on its tail on a test pad, waiting to prove that the runway really is optional.

Sources: Shield AI, TWZ, Naval News