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DARPA’s original VTOL X-Plane program is complete, but its published performance numbers were targets—not proof that a full-scale aircraft achieved them. Its battery-powered demonstrator used electric ducted fans, while the planned XV-24A was to use a hybrid turboshaft-generator system. A separate effort, SPRINT, is now developing Bell’s X-76, with flight testing planned for early 2028. Neither program should be mistaken for a conventional jet aircraft already proven to combine high speed with vertical takeoff.
What DARPA’s VTOL X-Plane was designed to do
The original VTOL X-Plane was a U.S. Defense Advanced Research Projects Agency (DARPA) Tactical Technology Office program aimed at combining vertical-flight capability with the speed and efficiency of a fixed-wing aircraft. DARPA’s program page now marks the effort complete. Its 2014 announcement named Aurora Flight Sciences, Boeing, Karem Aircraft and Sikorsky as Phase 1 performers. The companies proposed unmanned vehicles, although DARPA said the technologies could also apply to manned aircraft.
“Jet-powered” captures the speed ambition, but it is not an accurate description of the original demonstrator’s propulsion. The subscale aircraft used electric ducted fans powered by batteries. DARPA described the planned full-scale aircraft, designated XV-24A, as using a hybrid turboshaft engine to drive electric generators. Neither description is that of a conventional jet engine directly powering the aircraft.
What the original program’s performance figures mean
DARPA presented these numbers as program goals. They are not documented results from a full-scale XV-24A flight:
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| Measure | DARPA’s original target | Comparison cited by DARPA |
|---|---|---|
| Sustained speed | 300–400 knots | No separate baseline stated |
| Hover efficiency | At least 75% | 60% baseline |
| Cruise lift-to-drag ratio | At least 10 | 5–6 baseline |
| Useful load | At least 40% of projected gross weight | Projected gross weight of 10,000–12,000 pounds |
These targets appear on DARPA’s current program page and in its 2014 announcement. A 2017 DARPA account separately described the planned XV-24A as a 12,000-pound aircraft intended to exceed 300 knots, sustain full hover and vertical flight, improve hovering efficiency by 25%, and reduce system drag losses in cruise by 50% relative to helicopters. Those, too, were objectives rather than reported full-scale achievements.
How the subscale demonstrator flew
Distributed electric fans, not a full-scale engine
Aurora’s subscale aircraft carried 24 electric ducted fans: 18 in its main wings and six in its canard surfaces. The battery-powered test vehicle let the program examine its aerodynamic design, flight dynamics and control systems. DARPA said the planned XV-24A would use a different power arrangement: a hybrid turboshaft engine driving electric generators, with fan units planned to run at constant RPM and use variable pitch.
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Six flights in the first test phase
DARPA reported that the first phase ended after six flights. The aircraft demonstrated automated takeoff, sustained hover, directional and translational control—including lateral and rearward movement—waypoint navigation and automated landing. Subsequent testing expanded the flight envelope and exercised wing-borne flight controls. These are demonstrations by the subscale aircraft, not evidence that the projected full-scale aircraft flew.
Ashish Bagai, the DARPA program manager, said of the subscale aircraft: “The aircraft exhibited exceptional flight characteristics, with no loss in altitude even as it transitioned from vertical to horizontal flight.” The statement refers to that test aircraft and should not be read as a full-scale performance result. DARPA’s account is titled “DARPA Completes Testing of Subscale Hybrid Electric VTOL X-Plane” (April 4, 2017).
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How the newer SPRINT X-76 differs
SPRINT—short for SPeed and Runway INdependent Technologies—is a separate, newer effort involving DARPA and U.S. Special Operations Command. It is not a continuation of the completed VTOL X-Plane program. DARPA’s March 9, 2026 update said Bell was building its experimental X-76 after a successful Critical Design Review. Phase 2 began in May 2025 following Bell’s selection. DARPA said manufacturing, integration, assembly and ground testing would follow the review, with Phase 3 flight tests planned for early 2028. That schedule is a plan and may change.
DARPA describes SPRINT’s objective as cruise above 400 knots while hovering in austere environments and operating from unprepared surfaces. Bell’s July 2025 release described a goal of 400–450 knots at relevant altitudes, along with hovering from unprepared surfaces. The range is Bell’s stated goal; DARPA’s 2026 wording is “exceeding 400 knots.” Neither source reports that the X-76 has achieved those capabilities.
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Bell’s July 2025 account also described risk-reduction work on folding-rotor, integrated-propulsion and flight-control technologies, as well as wind-tunnel testing. Those activities are not flight tests of the X-76 itself. DARPA’s March 2026 announcement, “DARPA’s new X-76: the speed of a jet, the freedom of a helicopter,” quotes program manager Cmdr. Ian Higgins, U.S. Navy: “With SPRINT, we’re not just building an X-plane; we’re building options.”
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VTOL X-Plane and SPRINT X-76 compared
| Comparison | Original VTOL X-Plane / XV-24A | SPRINT / X-76 |
|---|---|---|
| Speed target | 300–400 knots sustained, a program target reported by DARPA in 2014 | Above 400 knots, DARPA’s 2026 objective; Bell stated 400–450 knots at relevant altitudes in 2025 |
| Hover and vertical flight | Full hover and vertical flight were planned for the full-scale XV-24A; the subscale demonstrator demonstrated sustained hover | Hover in austere environments is a DARPA objective; Bell described hovering from unprepared surfaces |
| Unprepared surfaces | Not stated in the cited DARPA descriptions | Operation from unprepared surfaces is a stated objective |
| Propulsion or configuration | Subscale aircraft: 24 battery-powered electric ducted fans across tilting wings and canards. Planned XV-24A: turboshaft driving electric generators, with constant-RPM, variable-pitch fans | Not stated in the cited DARPA and Bell updates |
| Program maturity | Program complete; subscale demonstrator completed its first test phase after six flights. Full-scale XV-24A flight achievement is not reported | Bell was building the X-76 after Critical Design Review as of DARPA’s March 2026 update; flight tests were planned for early 2028 |
The comparison shows why the similar high-speed, runway-independent ambitions should not blur the programs together: they have separate names, aircraft and maturity timelines, and the cited updates do not establish the X-76’s propulsion configuration.
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What is—and is not—established
DARPA’s record establishes that the original program produced a subscale vehicle that flew and demonstrated specific hover, control, navigation and landing functions. It does not establish that the planned full-scale XV-24A flew or met its performance targets. For SPRINT, DARPA’s 2026 update establishes that Bell’s X-76 was in construction after design review; the flight capabilities remain objectives, with testing planned rather than completed.
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