Naval Air, Unmanned: US Navy Flying Toward N-UCAS

UCAS-D/ N-UCAS concept
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Aerial refueling tests. (Jan 26/12)

In early 2006 the future of DARPA’s J-UCAS program seemed uncertain. It aimed to create Unmanned Combat Aerial Vehicles (UCAV) for the USAF and Navy that could approach the capabilities of an F-117 stealth fighter. Boeing’s X-45C was set to face off against Northrop Grumman’s X-47B Pegasus, the program had demonstrated successful tests that included dropping bombs, and aerial refueling tests were envisioned.

J-UCAS was eventually canceled when the services failed to take it up, but the technologies have survived, and the US Navy remained interested. A May 2007 non-partisan report discussed the lengthening reach of ship-killers. Meanwhile, the US Navy’s carrier fleet sees its strike range shrinking to 1950s distances, and prepares for a future with fewer carrier air wings than operational carriers. Could UCAV/UCAS vehicles with longer ranges, and indefinite flight time limits via aerial refueling, solve these problems? Some people in the Navy seem to think that they might. Hence UCAS-D/ N-UCAS, which received a major push in the FY 2010 defense review. Even as emerging privately-developed options are expanding the Navy’s future choices…

• Naval Air, Unmanned: Programs & Potential
• UCAS-D: Program & Team [updated]
• UCAS-D: Northrop Grumman’s X-47B
• Naval UCAVs: Contracts and Key Events [updated]
• Additional UCAV Readings

N-UCAS: Programs & Potential

X-47B concept
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N-UCAS (Naval Unmanned Combat Air System) is the US Navy’s broader umbrella initiative to define/develop/produce a fleet of unmanned, carrier based strike and surveillance aircraft. The UCAS-D demonstration program is a subset of that initiative. If the demonstrations go well, the Navy may progress to an Unmanned Carrier-Launched Airborne Surveillance and Strike (UCLASS) program.

In July 2007, Northrop Grumman’s X-47B Pegasus beat Boeing’s X-45C to win the UCAS-D development contract. Northrop Grumman’s Aug 3/07 release describes their mission as:

“The UCAS-D effort will mature critical technologies, reduce unmanned air system carrier integration risks and provide information necessary to support a potential follow-on acquisition milestone.”

Translation: show us that this can work, and demonstrate the first carrier-based launches and recoveries of a tailless, autonomous, “LO-relevant” aircraft, as well as aerial refueling tests. “Low Observable relevant” means that its outer shape must reflect stealth requirements, but without any of the operational stealth coatings and other expensive measures. That makes sense, since UCAS-D is only about aerodynamics and control. Eventually, N-UCAS will have to test stealth as well.

Right now, there are 2 big technical challenges for UCAS-D. One is safe, reliable flight and landings in carrier-controlled airspace, for a stealth aircraft that may not always be visible on radar. The other is successful and safe aerial refueling.

If Northrop Grumman or emerging competitors can overcome those challenges, the Navy would receive the equivalent of a carrier-borne F-117 stealth fighter, with improved stealth and no pilot fatigue limits. Like the F117, its self-defense would involve remaining undetected. While UCAVs can theoretically be built to execute maneuvers no human pilot could handle, the pilot’s awareness of surrounding events would be quite limited. The X-47B is not being designed to do what the type inherently does poorly – but to do what the type does inherently well: be stealthier than manned aircraft, and fly on station for days if necessary with aerial refueling support.

If that support is present behind the front lines, an N-UCAS wing could easily sally forth to hit targets 3,000 miles from their host carrier, while pilots inside the ship fly in shifts. The X-47s could fly a much shorter distance back to aerial tankers as needed, only returning to the steaming carrier several days later, or when their weapons had been used up.

If and when the US Navy proceeds with a full deployment program, the X-47 will have competitors. General Atomics is first out of the gate, expanding its jet-powered Predator C “Avenger” research program to include a carrier-capable “Sea Avenger” as well. Boeing is another clear competitor, who makes F/A-18 Super Hornet naval fighters, and has the privately-developed X-45 Phantom Ray. It was developed under the earlier DARPA J-UCAS effort, and didn’t include carrier capability before, but Boeing has reportedly expressed interest in the Navy’s interim UCLASS RFI.

Beyond Boeing, Britain’s BAE Taranis and Europe’s Dassault-led nEUROn program have excluded carrier operations from their programs, but France has a full-size aircraft carrier, and Britain expects to join her by 2020. Once the initial demonstration phases are done, work on carrier-related R&D is a distinct possibility.

UCAS-D: Program & Team

Someday?
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The first X-47B Pegasus UCAS-D (AV-1) was scheduled to fly in December 2009, but that was pushed back to Q1 of CY 2010, and finally ended up taking place in February 2011. It has begun a series of detailed flight envelope and land-based carrier integration and qualification events at Edwards AFB, CA. AV-1 will then return to NAS Patuxent River to begin land-based trials of the carrier landing concepts, before a planned first carrier landing. That landing was initially set for late 2011, but the firm now talks about 2013.

AV-2, which is equipped with full refueling systems, was expected to make its first flight in November 2010, and begin testing autonomous aerial refueling (AAR). Early 2011 saw the AV-2 airframe pass static and dynamic load tests, but AV-2’s flights were delayed until AV-1 finishes its own tests, in late 2011, and didn’t take off until November 2011. It will go on to begin carrier-related testing in 2012, and aerial refueling tests are still on the horizon. The Navy intends to achieve both probe & drogue (USN style) and boom/receptacle (USAF style) autonomous aerial refueling demonstrations.

Those tests will be the culmination of long effort. Milestones to date include:

2002: First experiments supporting unmanned carrier operations.
2005: At-sea testing of a modified King Air, no landing.
2007: UCAS-D team begins the detailed design of carrier integration.
Jan 2010: Initial capability of the carrier’s new equipment verified during testing aboard the USS Abraham Lincoln.
Fall 2010: Ship modifications began on the USS Eisenhower.
Feb 4/11: First UCAS-D (AV-1) flight. Other X-47 variants had flown before.
June 2011: Initial surrogate aircraft testing with USS Eisenhower validates the UCAS system’s readiness for carrier landings.
July 2/11: VX-23 F/A-18D Hornet performs an automated landing aboard USS Eisenhower, using UCAS-D systems.
Nov 22/11: UCAS-D AV-2 first flight.

If all goes well in UCAS-D, the USA’s Naval Aviation Master Plan currently includes provisions for introduction of a Navy UCAS (N-UCAS) around 2025. If all goes very well, and the US Navy follows through on its shift toward an X-47B that can be used for limited missions, pressure will build for much earlier deployment. There are already indications of pressure along those lines, and the UCLASS RFI sets a goal of fielding a limited capability UCAV on board American carriers by 2018 or so.

Barring continued and substantial pressure from above, however, the level of cultural shift required by the naval aviation community is likely to slow down any deployment of advanced UCAVs on board ships. Even as competitors like General Atomics (Predator C “Sea Avenger”) prep their own N-UCAS offerings. Northrop Grumman’s UCAS-D team hopes that by completing this funded demonstration phase, they will be able to offer a proven option, with a more complete set of advanced capabilities than privately-developed or late-moving competitors.

Northrop Grumman’s facility in Palmdale, CA is the final assembly site for the X-47B, and the industrial team also includes:

• Pratt & Whitney (F100-PW-220U engine)
• Lockheed Martin, incl. their Skunk works (stealth design, testing support, arresting hook)
• Dell
• Eaton Aerospace
• GE Aviation (incl. landing gear)
• GKN Aerospace
• Goodrich
• Honeywell
• Moog Inc.
• Parker Aerospace
• Rockwell Collins
• United Technologies’ Hamilton Sundstrand
• Wind River (embedded computing specialists)

UCAS-D: Northrop Grumman’s X-47B

X-47B 3-view
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UCAVs currently have no real situational awareness of the airspace around them, which makes them sitting ducks for any attack that doesn’t use radar guidance, and isn’t picked up by their radar warning receivers. Even an alerted UCAV currently has few options but to try and change course. That may work against ground threats, but mobile aerial opponents will simply follow and kill them. Their best defense is not to be found – or if found, to make it hard to keep a radar track on them, or to vector in enemy aircraft. This may be why high-end strike UCAVs like the Boeing X-45 Phantom Ray, European nEUROn, British Taranis, and Russian MiG SKAT all use the maximum stealth configuration of tailless subsonic blended wing bodies, with shielded air intakes and attenuated exhausts.

The X-47B’s modified flying wing design and top-mounted air intake reflect this orientation. By removing the pilot and opting for sub-sonic speeds, Northrop Grumman is able to field a design that looks like a more advanced version of its B-2 bomber. Instead of a straight flying wing like Boeing’s competing X-45C, however, their engineers opted for a cranked wing that improves landing characteristics on carrier decks, and makes its easy to use carrier-borne aircrafts’ classic “folding wing” design for improved storage in tight spaces.

This UCAV may be a short plane, but it’s not a small one. The X-47B’s 62.1 foot wingspan rivals the Navy’s old F-14s, and is wider than a Navy F/A-18 Hornet or even a larger Super Hornet. Because of its foreshortened length, however, its storage “spot factor” relative to an F/A-18C Hornet (“1.0”) is just 0.87.

Target and strike
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Pratt & Whitney Canada JT15D-5C turbofan engine powered previous X-47 models, but the UCAS-D will adopt Pratt & Whitney’s F100-PW-220U, a modified variant of the engine that powers American F-16 and F-15 fighters. Subsonic requirements and carrier-based employment changed the engine’s imperatives: it will produce less thrust than its F100 counterparts (just 16,000 pounds), in exchange for efficiency improvements and better protection against the corrosive salt-water environment.

Efficiency matters to this platform. Unrefueled X-47B range is expected to be between 1,500 – 2,100 nautical miles, with a maximum payload of 4,500 pounds. The standard payload is expected to be a pair of 2,000 pound JDAMs, but the weapon bay’s ultimate size and shape will determine its ability to carry other options like strike missiles, JSOW glide bombs, a pair of 4-bomb racks for the GPS-guided Small Diameter Bomb, the forthcoming Joint Air-Ground Missile, etc.

Sensors are currently to be determined, as they aren’t really the point of UCAS-D. Any Navy strike platform is expected to have an advanced SAR radar with Ground Moving Target Indicator (SAR/GMTI), conformal electro-optic day/night cameras, and ESM (Electronic Support Measures) equipment that helps it pinpoint and trace back incoming electromagnetic signals. Given the X-47B’s design’s inherent strengths of stealth and long endurance, additional modules or payloads for tasks like signals collection must surely be expected.

Naval UCAVs: Contracts and Key Events

UCAS-D load testing
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See also “Boeing to Advance UAV Aerial Refueling” for background and updates regarding unmanned aerial refueling test programs in the US military – which now include UCAS-D/ N-UCAS.

Unless otherwise indicated, The Naval Air Systems Command Patuxent River, MD manages these contracts.

Jan 21/12: NAVAIR/AFRL’s AAR program completes a series of ground and flight tests that began in November 2011, using a Calspan Learjet surrogate with X-47B hardware and software, and a Omega Air Refueling K-707 aerial tanker. The tests included simulated flight demonstrations of both boom/receptacle (USAF) and probe-and-drogue (Navy & European) aerial refueling techniques, but no fuel was actually transferred, and Calspan’s Learjet wasn’t equipped for that anyway. The tests were all about correct positioning and coordination, beginning at a position 1 nautical mile from the K-707, and allowing autonomous guidance to move the Learjet into the 3 air-air refueling positions: observation, contact, and re-form.

Navy UCAS program manager Capt. Jaime Engdahl says that the next big step will involve using the actual X-47B. The team plans to conduct 2 more surrogate test periods before a planned refueling demonstration with the X-47B in 2014. NAVAIR | Northrop Grumman.

Nov 22/11: UCAS-D demonstrator #AV-2 takes off for the 1st time at Edwards AFB, CA. That’s about a year late, but AV-1’s issues had to be ironed out first.

With 2 flying UCAVs, the program is expected to move AV-2 to NAS Patuxent River, MD by the end of 2011, and begin testing carrier landing technologies in 2012. That will include GPS-guided precision approaches to the carrier, arrested landings and “roll-out” catapult launches at land-based test facilities; and flight testing of new precision navigation computers and guidance/ navigation/ control software recently installed on both aircraft. The new suite of hardware and software is designed to let the X-47B land safely on a moving aircraft carrier deck. AV-1 will continue testing at Edwards AFB, with a focus on finding its flight limits. Northrop Grumman.

Nov 7/11: Inside the Navy reports [subscription] that the US Navy will be expanding the X-47B’s planned aerial refueling capability, to autonomously refuel while in flight with both USAF Air Force and USN aerial tankers.

The USAF uses KC-135s and KC-10s, but many of the KC-135s need to place an attachment on the refueling boom, in order to refuel probe-carrying aircraft. The US Navy has KC-130 Hercules aerial tankers, and its F/A-18E/F Super Hornets can become “buddy refuelers” with special wing tanks.

July 18/11: Northrop Grumman Systems in San Diego, CA receives a $25 million cost-plus-incentive-fee contract modification for UCAS-D autonomous aerial refueling technology maturation and demonstration activities. They’ll provide “air systems, air vehicle segment, and mission management segment requirements definition; integration planning and verification planning; and definition of certification requirements and approach.”

Work will be performed in San Diego, CA, and is expected to be complete in December 2012. US Naval Air Systems Command in Patuxent River, MD manages the contract (N00019-07-C-0055).

July 2/11: A contractor/government team lands an F/A-18D test aircraft from Navy squadron VX-23 on the USS Eisenhower in the western Atlantic Ocean, using hardware and software developed for the X-47B UCAS-D. This Hornet had a pilot on board as a safety precaution, but the system landed the plane. A King Air 300 twin-prop plane from Air-Tec, Inc. was also used as a surrogate to test mission management, command and control, communications, air traffic control and navigation, without executing an actual landing. Participating organizations included USN PEO Carriers, NAVSEA PMA-268, and the crew of the USS Dwight D. Eisenhower; plus industry partners Northrop Grumman, Rockwell Collins, Honeywell, L-3 Communications, SAIC, ARINC and Sierra Nevada Corporation.

It’s a big step forward for the UCAS-D program, and came after a series of interim steps detailed in the accompanying releases. It could also change the way Navy pilots land manned aircraft. Right now, carrier andings are very manual, and visual. All air traffic control instructions are by voice, and even a good portion of navigation data has to be read out over the air, while visual signals cement the final approach.

Supporting a UAV, and possibly retrofitted manned fighters, in future operations, required some important ship modifications. Eisenhower’s Landing Signal Officer (LSO) equipment was altered to communicate directly with the VX-23 F/A-18D through a digital network, and so were the ship’s primary flight control (“tower”) and Carrier Air Traffic Control Center (CATCC). The UAS operator’s equipment, installed in one of the carrier’s ready rooms, was the other key network node. Precision Global Positioning System (PGPS) capabilities with sub-1 meter accuracy were then added into the ship and the aircraft, to provide constant position awareness. US NAVSEA | Northrop Grumman.

June 23/11: US NAVAIR awards a set of UCLASS study contracts to 4 vendors. Boeing publicly touted its own 8-month, $480,000 study contract, which includes developing of a concept of operations, an analysis of alternatives, and an investigation of notional solutions for various components of the Navy’s UCLASS program, which could be fielded for ISR and strike operations by 2018. Boeing’s option would include the X-45C Phantom Ray UCAV, but similar contracts for about $500,000 each were issued to Northrop Grumman (X-47B/ UCAS-D), General Atomics (Sea Avenger, also new EMALS/AAG carrier launch/recovery systems), and Lockheed Martin (unknown, has previously discussed the possibility of an unmanned F-35).

The UCLASS system will consist of an air segment (the UCAV), a connectivity and control segment, a launch and recovery segment, and a systems support segment. FBO.gov announcement | Boeing.

May 16/11: Northrop Grumman announces that it has picked up awards from the USAF Flight Test Center at Edwards AFB, CA, including Flight Test Team of the Quarter (above candidates like the F-35) for its X-47B/UCAS-D aircraft.

April 25/11: ARINC Engineering Services, LLC in Annapolis, MD receives a $9.7 million cost-plus-fixed-fee contract for technical and engineering services in support of the Joint Precision Approach and Landing Systems (JPALS) and Navy Unmanned Combat Aerial Systems (N-UCAS) programs. The 2 are related, as JPALS precision GPS-driven approach is a natural fit with the landing needs of a carrier-borne UCAV.

Work will be performed in Lexington Park, MD (80%), and St. Inigoes, MD (20%), and is expected to be complete in October 2011. This contract was not competitively procured by the US Naval Air Warfare Center Aircraft Division in Patuxent River, MD (N00421-11-C-0034).

March 28/11: US NAVAIR issues a Broad Agency Announcement regarding UCLASS, in solicitation #N00019-11-R-0031:

“The Naval Air Systems Command seeks proposals which conceptually demonstrate that a UCLASS system can provide a persistent Carrier Vessel-Nuclear (CVN) based Intelligence, Surveillance, and Reconnaissance (ISR) and strike capability supporting carrier air wing operations in the 2018 timeframe. In order to identify and explore available trade space…. The program anticipates leveraging existing, deployed Department of Defense (DoD) systems to launch, recover, and control the air vehicle, transfer data in support of time critical strike operations, and conduct persistence ISR operations. The ongoing Unmanned Combat Air System-Demonstration program will inform UCLASS development and provide technology risk reduction for Unmanned Aircraft (UA) integration into carrier environments.”

March 14/11: A US Navy/Northrop Grumman Corporation test team issues a report stating that 5 weeks of dynamic load testing on X-47B air vehicle 2 (AV-2) demonstrated its ability to handle the stresses, strains and dynamic loads associated with carrier catapult launches and arrested landings, and air-to-air refueling. AV-2 is the X-47B airframe that will be equipped for air-to-air refueling tests.

The tests themselves finished on Jan 24/11, a week ahead of schedule. NGC AV-2 manager says they included 8 design conditions, including a 3-G symmetrical pull up, a 2.4G rolling pullout, and turbulence during aerial refueling; and 5 conditions expected to occur on the ground, including takeoff and landing tests involving the nose gear and tail hook. To conduct the tests, engineers bonded pads to 200 points on the airframe surface, and then pushed and pulled on those pads using hydraulic jacks to simulate various static and dynamic load conditions. Northrop Grumman.

March 1-4/11: The X-47B UCAS-D makes its 2nd and 3rd of 49 planned flights at Edwards AFB, CA. Testers are working to expand the flight test envelope in terms of air speeds, altitudes and operating weights, while testing key systems. Major concerns at this point include its flight control system’s ability to handle unpredictable crosswinds and turbulence at all speeds, the accuracy of its flush-mounted air data testing instruments, and engine performance. NGC.

Feb 15/11: General Atomics Aeronautical Systems, Inc. announces success in wind-tunnel tests of its Sea Avenger model, intended to validate its new wing’s low-speed handling characteristics. a key wind tunnel test on a model of its jet-powered Sea Avenger Predator C variant. The new wing is also designed to increase aircraft dash speeds, which is an interesting engineering combination.

GA-ASI President Frank W. Pace touts the 90-hour, 8-day test at the San Diego Air & Space Technology Center, as a classic example of his firm’ push to invest in early development, ahead of customer requirements for a UCLASS type system. The firm’s past history with the MQ-1 Predator and MQ-9 Reaper backs up his boast.

Feb 7/11: Lockheed Martin touts their own involvement in the X-47B program, which mostly revolves around low observable (stealth) design and aspects of aerodynamic edges, inlet lip and control surfaces, and an all new arresting hook system. Al Romig is the current VP of Advanced Development Programs for Lockheed Martin Aeronautics, and the firm completed delivery of its UCAS-D hardware in December 2009. Lockheed Martin will continue to support further UCAS-D flight testing, as well as carrier flight operations.

UCAS-D 1st flight
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Feb 4/11: First UCAS-D flight. The flight took off at 14:09 PST (GMT -0800) at Edwards AFB, and lasted 29 minutes, flying between 180 – 240 kt and climbing to 5,000 feet with landing gear down at all times, while executing racetrack patterns. It provided test data to verify and validate system software for guidance and navigation, and aerodynamic control of the tailless design. The flight follows airframe proof load tests, propulsion system accelerated mission tests, software maturity and reliability simulations, full system taxi tests, and numerous other system test activities that happen before any 1st flight.

Eugene Fly had made the first landing on a stationary ship on Jan 18/1911, but a 100th anniversary flight for X-47B #AV-1 wasn’t possible. Some of items that delayed this flight from original expectations in late 2009 included propulsion acoustic and engine-start sequencing issues, an asymmetric braking issue uncovered during taxi tests, and a last-minute maintenance issue with an auxiliary power generation system.

Testing continues. Aircraft AV-1 will remain at Edwards AFB for flight envelope expansion before transitioning to Naval Air Station Patuxent River, MD, later in 2011, where they will validate its readiness to begin testing in the maritime and carrier environment. Meanwhile, the refueling-ready AV-2 has completed its design limit load tests up to 130% with no test anomalies, showing that it’s able to withstand g-loads encountered during aerial refueling. It won’t begin its own tests until AV-1’s initial tests are done, which is currently planned for late 2011. The program is currently preparing the X-47B for carrier trials in 2013. US Navy | NGC release | Bullet points, images & video | Aviation Week.

Feb 2/11: USAF opportunity? Defense news quotes Col. James Gear, director of the USAF’s Remotely Piloted Aircraft Task Force, on the future of its UAV fleet. Despite a big commitment to the MQ-1 Predator, the MQ-9 Reaper caused a major mid-stream shift in plans. Col. Gear cites some existing issues with the MQ-9, which could leave it open to a similar shift.

The Reaper does not fare well in icing conditions, and is also not considered survivable against anti-aircraft systems. The issue of jam and snoop-proof data links, and trace-back and verification of signal origins, has also been a live question during the MQ-1 and MQ-9’s tenure. The “MQ-X” that replaces it will have to do better on all 3 counts, and the USAF also wants it to be easily upgradeable via switch-out modules. The Colonel believes the resulting UAV will end up being common with the US Navy’s carrier-based UCLASS requirement, as the 2 services are cooperating closely. That could give Northrop Grumman’s funded X-47B N-UCAS an edge over Boeing’s privately developed X-45 Phantom Ray. It could also offer a boost to General Atomics’ Predator C/ Sea Avenger.

Manned and…not
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July 19/10: General Atomics Aeronautical Systems, Inc. touts its jet-powered Predator C Avenger UAS as “ready for deployment” under programs like the British RAF’s SCAVENGER, or as the MQ-X successor to the USAF’s MQ-9 Reapers. The Avenger family’s avionics are based upon the Predator B/MQ-9 Reaper, and the plane features both radar and optical sensor options, plus a variety of internal weapons loads up to 2,000 pound Joint Direct Attack Munitions (JDAM).

Ready for deployment” is stretching things a bit. The Predator C series first flew in April 2009, “tail one” is currently averaging 2-3 flights a week, and flight tests were recently transferred from GA-ASI’s Gray Butte Flight Operations Facility in Palmdale, CA, to Naval Air Station (NAS) China Lake, CA. GA-ASI Aircraft Systems Group President Frank Pace does describe some results as “exceeding our expectations,” including excellent agreement between advance engineering and flight tests, and fuel burn rates up to 10% better than predicted models. The UAV reportedly uses a Pratt & Whitney Canada PW545B engine, which also powers the Cessna Citation XLS business jet.

May 3/10: Competition. General Atomics announces that it has submitted its “Sea Avenger” as a potential candidate for UCLASS airborne surveillance and strike requirement. Their UCAV is based on their jet-powered, 44-foot long and 66-foot wingspan “Predator C Avenger,” which can fly at 400 knots for up to 20 hours, and operate up to 50,000 feet. Design changes include a highly fuel-efficient engine and inlet design, a Lynx SAR ground-looking radar, retractable electro-optical/infrared (EO/IR) sensors and a 3,000 pound capacity internal weapons bay, and folding wings. The structure can accommodate carrier suitable landing gear, tail hook, drag devices, and other provisions for carrier operations.

Developed on company funds for near-term military use, the base Predator C Avenger is continuing through its planned test program, with a 2nd aircraft currently under development and expected to be complete by the end of 2010. General Atomics.

March 19/10: UCLASS RFI. The US Navy issues a Request for Information for a (UCLASS). The RFI indicates that the Navy is looking to move ahead with full unmanned combat aircraft earlier than its original plans.

“The Navy is interested in information on carrier based, low observable (LO) Unmanned Air Systems (UAS) concepts optimized for Irregular and Hybrid Warfare scenarios, capable of integrating with manned platforms as part of the Carrier Air Wing (CVW) by the end of 2018 to support limited operations in contested scenarios. The UAS should enhance situational awareness and shorten the time it takes to find, fix, track, target, engage, and assess time sensitive targets. This RFI is intended to determine the existence of sources that can provide a limited inventory of systems capable of being operated by fleet Sailors and performing the above mentioned Navy UAS mission.”

The UCLASS concept involves 4-6 UAVs that could perform both intelligence/ surveillance/ reconnaissance (ISR) and strike missions in contested airspace, that are able to fly for 11-14 hours without refuelling. Industry reportedly expected the navy to release a UCLASS RFP in early 2011, and interested parties beyond Northrop Grumman include General Atomics (Sea Avenger), and reportedly Boeing (X-45 Phantom Ray) as well. See: FedBizOpps RFI | Flight International | Jane’s.

March 17/10: Janis Pamiljans, previously vice president and program manager of Northrop’s KC-30 aerial refueling tanker bid for the USAF, takes over from Scott Winship as vice president of N-UCAS related efforts. Pamiljans also has worked as a program manager on the F/A-18 and F-35 strike fighter programs.

Aviation Week points out that this is just one of several corporate moves, which seem to be aimed at freeing people up to participate in “black” (classified) programs, and develop a next-generation stealth aircraft for reconnaissance and long-range strike. Aviation Week | Defense News.

March 2/10: Capt. Jeff Penfield takes over the Navy’s X-47B program office, replacing Capt. Martin Deppe. Source.

Feb 18/10: Don Bolling, a Lockheed Martin senior business development manager, hints that General Atomics’ Predator C has a customer, and isn;t just a privately funded effort. He tells a media source that General Atomics Aeronautical Systems is interested in “Global Hawk-like” payloads for high altitude surveillance on its jet-powered Predator-C Avenger UAV, putting efforts to install the F-35 fighter’s Sniper pod-derived electro-optical targeting system (EOTS) on hold.

The shift was reportedly at the request of a customer, which made the report news because the Predator C wasn’t known to have a customer. The USAF already flies Global Hawks, and export approvals for the EOTS and Predator C would be an involved process. The most likely guess as to the customer would be the CIA, which does operate UAVs of its own, or US Special Operations Command. Flight International.

Feb 13/10: The US Navy announces that N-UCAS team members are underway with USS Abraham Lincoln [CVN 72] to test the integration of existing ship systems with new systems that will support the X-47B in carrier-controlled airspace. The team is testing X-47B software integration by using a King Air turbo prop “surrogate” aircraft taking off and landing from shore, but approaching the carrier and performing the various procedures associated with systems like Prifly, CATCC, LSO, etc. The digital messages from shipboard controllers receive “wilco” (ACK) responses to verify receipt.

Additional developmental testing later this year, will involve testing the software integration using an F/A-18 surrogate aircraft, to more closely emulate the X-47B’s flight.

Feb 4/10: Defense News reports that the N-UCAS program is slated to receive a $2 billion boost over the next 5 years, and seems set to follow the RQ-4 Global Hawk procurement model, rather than remaining a demonstration aircraft.

The RQ-4 Global Hawk was an advanced development program that was moved to the front lines after the 9/11 attacks, and became a fully operational platform. The 2010 Quadrennial Defense Review featured a tilt away from technology demonstrator status, and toward an X-47 UCAV that can perform surveillance and/or strike roles. That would let the Navy field operational UCAVs much sooner, and allow them to field a capability that could be similar but superior to the USAF’s current RQ-170 Sentinel/”Beast of Kandahar” stealth UAV. Those exact capabilities remain a matter for discussion, however, as Navy Undersecretary and UCAV advocate Bob Work points out:

“There is a lively debate over whether or not the N-UCAS demonstrator should result in a penetrating, ISR strike bird, or be more of a strike fighter… That debate has not quite been resolved. Having this extra $2 billion added to the budget is going to help us resolve that debate.”

Jan 26/10: Northrop Grumman Integrated Systems Sector in San Diego, CA received an $11 million not-to-exceed modification to a previously awarded cost-plus-incentive-fee contract for autonomous aerial refueling technology maturation and demonstration activities in support of the Navy UCAS-D.

Work will be performed in El Segundo, CA (60%) and Rancho Bernardo, CA (40%), and is expected to be complete in November 2010 (N00019-07-C-0055).

Jan 17/10: First low-speed taxi test of an X-47 N-UCAS. Source.

Dec 22/10: Trouble with engine start sequencing and propulsion acoustics will now reportedly delay the X-47B’s December 2009 flight to some time in the first 3 months of 2010. Gannett’s Navy Times | Defense Update.

Nov 25/09: Aviation Week reports that the X-47 UCAS-D system demonstrator is experiencing “propulsion acoustic and engine-start sequencing” issues, which will require additional testing and push its 1st flight to 2010.

The US Navy reportedly says UCAS-D is still on track for sea trials in 2012, but Northrop Grumman has placed a “moratorium” on press interviews for UCAS-D – never a good sign.

Nov 2/09: The Brookings Institute’s 21st Century Defense Initiative hosts Chief of Naval Operations Admiral Gary Roughead, who discusses the U.S. Navy’s use of new technologies, and its development and integration of unmanned systems. Excerpts:

“I would say that where we can make some significant breakthroughs us just in the organizing principles and in the way that we approach the unmanned systems. The idea of being able to disembark or embark long-range unmanned air systems for example changes the nature in which we can run flight decks, changes the nature of the carrier air wing configurations as we move into the future.

....I would also say that I am often struck that as we talk about unmanned systems we’ve really become enamored with the vehicle itself and there has been very, very little discussion and arguably little work on something that makes it all work together and that’s the network and the architecture of the network, how the information will be moved, what are the redundancies that you would have in place, and what are the common protocols that are going to be required as we move into the future.”

See WIRED Danger Room | Brookings Institute and full transcript [PDF]

Oct 6/09: GE Aviation announces that it has delivered the first fully-dressed X-47B UCAS-D landing gear to Northrop Grumman Corporation. “Fully-dressed” landing gear is designed to meet or exceed all U.S. Navy carrier landing requirements for a fully loaded UCAS-D aircraft. GE Aviation says that its combined systems make it the largest non-partner equipment supplier to the X-47B, but the landing gear effort had partners of its own:

“Due to the demanding mission profiles required for this advanced carrier platform, the landing gear system incorporates the latest technology advancements in steering control from Parker Hannifin as well as anti-skid braking systems from Goodrich Corporation.”

Aug 11/09: AUVSI 2009 event reports indicate progress on several fronts from the UCAS-D program.

Flight International reports that an F/A-18D Hornet test plane with be modified to carry X-47B avionics and software, then used as a test bed to develop a fully integrated aircraft/carrier auto-landing system. The Navy is hoping to perform manned but “hands-off” approaches and landings on an aircraft carrier within 2 years, though that aspect remains to be decided.

Meanwhile, Shephard reports that number of USAF personnel will begin arriving at NAS Patuxent River as observers to PMA-268, the Navy UCAS Program Office. The planned air-air refueling demonstration was apparently the catalyst for USAF interest, and the second test aircraft (AV-2) is being built with full internal refueling systems on board.

July 29/09: Northrop Grumman announces a successful series of static and dynamic proof load tests, designed to ensure that the UCAV will be able to stand up to aircraft carrier launches, recoveries, and other associated stresses. For these torture tests, over 200 electro-hydraulic assemblies were attached to the major components of the X-47B, whereupon pressure was applied to simulate desired conditions. The 2-month effort included progressive structural, functional proof and calibration tests to verify the integrity of all flight control surfaces, major structural load paths, main landing gear structure, and the tailhook assembly.

The 2nd aircraft is currently being assembled, and will begin proof load tests later in 2009. UCAS-D aircraft will also undergo parallel engine integration and taxi tests through fall 2009, in preparation for first flight and aircraft carrier trials. Northrop Grumman Aerospace Systems VP and UCAS-D program manager, Scott Winship, cited that unforgiving environment, then promised that:

“The X-47B was built for these conditions, and as the results of the rigorous proof test show, the design of the aircraft is structurally sound for all aspects of carrier operations.”

Jan 12/09: Jane’s confirms that the X-47 UCAS-D program will begin aerial refueling tests performed in 2010, using surrogate aircraft.

Dec 9/08: Aviation Week quotes UCAS program manager Scott Winship, as part of a report that that Northrop Grumman will modify the second X-47B UCAS-D to allow autonomous aerial refuelling (AAR) using both U.S. Navy probe-and-drogue and U.S. Air Force boom-and-receptacle methods. The U.S. Navy has announced plans to award the company a sole-source contract to support the demonstration of AAR capability by 2013, under UCAS-D’s parallel technology-maturation phase.

Boeing is currently leading a team including X-47B partners Northrop Grumman and Lockheed Martin for the 4-year second phase of a parallel Air Force Research Laboratory program. Winship says the X-47B could be used to provide a “graduation exercise” for the AAR effort.

Nov 19/08: Boeing in St Louis, MO received a $49 million cost plus fixed fee contract as the automated aerial refueling Phase II integrator. At this point, $1.2 million has been obligated. The Air Force Research Laboratory at Wright-Patterson AFB, OH manages this contract (FA8650-09-C-3902). Read “$49M for Boeing to Advance UAV Aeral Refueling” for an explanation of the importance to the UCAS-D and similar programs.

July 14/08 Pratt & Whitney announces a $54 million contract from Northrop Grumman to develop and integrate the X-47 UCAS-D’s engine and exhaust system. The Pratt & Whitney F100-PW-220U engine will power the UCAS-D, providing up to 16,000 pounds of thrust while operating in a maritime environment, including carrier deck operations.

Just another day
at the office…
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August 1/07: Northrop Grumman Integrated Systems – Western Region in San Diego, CA received a $635.9 million cost-plus-incentive-fee contract for the Unmanned Combat Air System CV Demonstration Program (UCAS-D). Work will be performed in Rancho Bernardo, CA (38%); El Segundo, CA (29%); Palmdale, CA (13%); East Hartford, CT (7%); Jupiter, FL (2%); Nashville, TN (2%); Hazelwood, MO (1%), and various locations within the United States (8%), and is expected to be complete in September 2013.

The purpose of the UCAS-D is to demonstrate critical CV suitability technologies for a stealthy air vehicle in a relevant environment [DID: i.e naval/ aircraft carriers]. Expected deliverables include trade studies, analyses, software, reports and flight test data. This contract was competitively procured through a request for proposals; 2 firms were solicited [DID: that would be Boeing and NGC] and 2 offers were received (N00019-07-C-0055). See also Northrop Grumman’s Aug 3/07 release.

Sept 28/05: As part of DARPA’s J-UCAS program, Northrop Grumman Corporation’s X-47B conducted a successful simulated exercise at the Naval Air Warfare Center Weapons Division in China Lake, CA. It demonstrated the simultaneous control of 4 of its X-47B unmanned aerial vehicles (UAVs) during U.S. Navy aircraft carrier operations. See Dec 9/05 NGC release.

Using a surrogate aircraft which represented one X-47B, 3 additional simulated X-47B aircraft were successfully controlled during several flights using advanced mission-management software and air traffic control procedures currently used by Navy aircraft carriers. The air traffic controller provided standard commands to a single mission operator, who in turn ensured all four aircraft safely operated within the simulated carrier’s airspace. The controller had to demonstrate the ability to guide all 4 aircraft through approach, wave-off and traffic pattern procedures, while accomplishing proper spacing and air traffic de-confliction. The mission operator had to be able to monitor the entire process to ensure proper command response, and advise the controller on aircraft response or performance limitations.

This was one of many tests undertaken as part of J-UCAS. It is reproduced here for its ongoing relevance to the UCAS-D program.

Additional UCAV Readings