National Aeronautics Museum of Argentina Future Vertical Lift Takes Off

The Sikorsky- SB>1 Defiant made its first flight on March 21. (Sikorsky-Boeing photo)

With FARA underway, the Defiant taking flight, the release of the Pentagon’s FVL budget and a request for information for joint-service FLRAA missions, FVL is accelerating to full speed.

By Alan Graham

he Sikorsky-Boeing SB>1 Defiant high-speed compound Congress added $75M to the fiscal 2019 budget to kick off the demonstrator flew for the first time on March FARA program. It also added $20M for the JMR program (as a result T21, just days before the US Army released a request for of lobbying by VFS), a portion of which will be used to expand information (referred to here as a “Sources Sought Notice”) on the flight envelopes of the two demonstrators. The Army expects the Future Long-Range Assault Aircraft (FLRAA). shortly to put the teams under contract for the additional flying.

Originally expected by the end of 2017 but delayed by Meanwhile, the Army has added just over $10M to its fiscal 2020 manufacturing challenges and ground-test glitches, the Defiant’s budget request to accelerate FLRAA. Because it is a joint program, 30-minute first flight also came just weeks after the Army released the service will have to seek approval from the Office of the its fiscal 2020 budget request that seeks increased funding for Secretary of Defense to accelerate the program schedule. the medium-utility FLRAA and the armed- Future Attack Reconnaissance Aircraft (FARA). The Defiant is one of two technology demonstrators built under the Joint Multi Role (JMR) precursor to FLRAA. The rival FARA and FLRAA are the first products of the Pentagon’s Future demonstrator, Bell’s V-280 Valor advanced , first flew in Vertical Lift (FVL) initiative to replace its helicopter fleets with December 2017 and has exceeded its target 280 kt (519 km/h) a family of advanced rotorcraft. FARA, otherwise known as FVL cruise speed in more than 90 hours of flight testing. Capability Set 1, is intended to take over the armed scout role performed by the Bell OH-58D Kiowa Warrior until its budget- Designed for a cruise speed of at least 250 kt (463 km/h), the SB>1 driven retirement in 2017. FLRAA is intended to replace the Army’s shares the same rigid-rotor compound helicopter configuration UH-60 Black Hawks, Special Operations Command (SOCOM) MH- as Sikorsky’s S-97 Raider, but scaled up to the 30,000 lb (13.6 t) 60s and the US Marine Corps’ Bell UH-1Y Venoms. gross weight class. The 11,000 lb (5 t) Raider has already exceeded 200 kt (370 km/h) in flight testing. The Army’s budget request lays out plans to spend more than $4.7B on FVL over the future years defense plan (FYDP) that First flight of the Defiant was delayed due to challenges covers fiscal 2020 to 2024. This includes $427M in fiscal 2020 and manufacturing the carbon-fiber spars for its stiff rotor blades $2.13B over the FYDP for FARA, and $32M in fiscal 2020 and $984M and discoveries during ground testing of the propulsion system over the FYDP for FLRAA. testbed (PSTB). With the Army-led analysis of alternatives for FLRAA set to finish this quarter, this has raised concerns that FARA is already in source selection, and the Army plans to award the Sikorsky-Boeing team will not have time to provide the four to six contracts in the April/May timeframe to develop Army with data to inform the FLRAA requirement. preliminary designs for prototypes. The fast-tracked competitive

May / June 2019 / June May prototyping program calls for two teams to be selected in But Brig Gen Walter Rugen, director of the Army’s FVL Cross- fiscal 2020, leading to first flights in late 2022. Engineering and Functional Team, says Sikorsky and Boeing have already manufacturing development of the winning design could begin provided 80% of the data required under the JMR technology in fiscal 2024. demonstration. A lot of that data is from the PSTB at Sikorsky’s development flight center in West Palm Beach, Florida, he 14 says. The Bell Valor team does not have an equivalent to the PSTB — which includes the entire rotor system, engines and tail system anchored to the ground — and instead tested the completed V-280 in tiedown tests in October- November 2017.

On April 4, two weeks after the Defiant finally flew, the Army released the RFI for FLRAA. The solicitation lays out a schedule that would equip the first Army unit with aircraft by the second- quarter of fiscal 2030. The Army would be designated at the lead service with SOCOM “participation,” and the USMC acquisition program following about two years behind the Army. The RFI calls Sikorsky has stated that the 11,000 lb (5 t) S-97 Raider for the following schedule goals for the Army’s FLRAA: was the basis for company’s FARA proposal, which has a ■ Contract award in fourth-quarter fiscal 2021 maximum gross weight of 14,000 lb (6.4 t). (Sikorsky photo) ■ Preliminary Design Review in second-quarter fiscal 2023 ■ Prototype first flight in third-quarter fiscal 2024 However, the Marine Corps wants a higher speed capability ■ Critical Design Review in fourth-quarter fiscal 2024 — between 275 kt (509 km/h) and 305 kt (565 km/h) at 90% maximum continuous power and 295–330 kt (546–661 km/h) This represents a two-year acceleration from the Army’s previously at 100% intermediate power. This would appear to favor a stated schedule, which called for a Milestone A decision to launch tiltrotor. Other Marines-unique requirements include the ability the FLRAA program in fourth-quarter fiscal 2021, release of a to be based on L-class ships. SOCOM-unique requirements request for proposals for a competitive technology maturation include air transportability in a Boeing C-17. Both want aerial and risk reduction phase in first-quarter fiscal 2022, and contract refueling capability. award in second-quarter fiscal 2023. Industry teams are gearing up to bid for FLRAA. While the FARA The RFI also lays out performance and cost goals for FLRAA, aircraft is expected to be powered by the General Electric T901 including an average unit manufacturing cost target of $43M Improved Engine under development for the AH-64E and in 2018 dollars. This is significantly more expensive than the UH-60M, but the Army does not have a program of record for a UH-60M Black Hawk, for which Army budget documents give a new engine for FLRAA, which is expected to require a 5,000–6,000 weapon-system unit cost of $22M in fiscal 2018. shp (3,700–4,500 kW) class .

The RFI specifies the Army’s requirements, including a maximum Bell and Sikorsky-Boeing used existing engines to power their cruise speed of at least 250 kt (463 km/h), with 280 kt (518 km/h) JMR demonstrators: General Electric’s T64 in the V-280 Valor as an objective (with these two numbers bookending the speeds and Honeywell’s T55 in the SB>1 Defiant. As FLRAA gathers of the SB>1 and the V-280). This compares with 151 kt (280 km/h) momentum, Bell has partnered with Rolls-Royce to develop for the UH-60M. FLRAA’s unrefueled combat radius is to be at an optimized propulsion system for both the V-280 and its least 200 nm (370 km), with 300 nm (555 km) as an objective. Self- V-247 tiltrotor proposal for the Marine Corps MUX ship-based deployment range is to be 1,725–2,440 nm (3,195–4,520 km). The unmanned aircraft requirement (see sidebar). original UH-60A could fly 1,200 nm (2,222 km). Rolls-Royce’s 6,000-shp class AE1100 engine for the Bell Boeing The Army’s FLRAA is required to carry 12 fully-equipped, 365- V-22 could form the basis of a propulsion system for FLRAA. The lb (165-kg) troops. The UH-60M can carry 11 at 290 lb (130 kg) Army, meanwhile, has funded science and technology efforts to each. Alternatively, the rotorcraft is required to carry an external develop technology for possible future FLRAA-class powerplants cargo load of 8,000–10,000 lb (3.6–4.5 t) for 110 nm (204 km) at a — the Future Affordable Turbine Engine (FATE) with GE, and the minimum of 140 kt (259 km/h). The UH-60M has a hook capacity Alternative Concept Engine (ACE) with Honeywell-Pratt & Whitney of 9,000 lb (4 t). joint company Advanced Turbine Engine Company (ATEC). May / June 2019

The Bell V-280 Valor exceeded 280 kt (520 km/h) on Jan. The Defiant (shown here) and the Valor JMR Technology 23. (Bell photo) Demonstrators were sized for the “FVL-Medium” class as envisioned in 2010. (Sikorsky-Boeing photo) 15 While Army aviation leadership portrays the fiscal 2020 budget request as a victory for FVL, it comes at the cost of cuts to existing helicopter procurement programs. These include plans to stop buying new- build AH-64Es and slow the procurement of remanufactured Apaches over the FYDP. The Army also plans to slow procurement of new UH-60Ms and upgraded, digital- cockpit UH-60V Black Hawks over the FYDP. But the biggest billpayer is the Army’s Block II upgrade for the Boeing CH- 47F Chinook heavy-lift helicopter. Boeing flew the first of three Block II development aircraft on March 28, but the Army wants to cancel or delay 542 Block II upgrades for regular Army CH-47F and only procure Bell’s V-247 Vigilant mock-up illustrates the potential size of the Marine the refit for special-operations MH-47G. Corps’ MUX requirement. (Bell photo) Among other improvements, the Block II Advanced Chinook Rotor Blade (ACRB) MUX Gains Momentum restores the lifting capability lost to weight The amount is small, but the fiscal year 2020 defense budget request keeps the US growth over the years. Marine Corps’ ambitious multi-mission, ship-based Group 5 unmanned aircraft, the MUX, moving toward its planned operational capability in fiscal 2026. Justifying the plan, Army leadership says the CH-47F Block I fleet is the youngest The $18.5M sought is an increase from just over $10M provided in fiscal 2019 for in the service and it has over 10% more MUX, which stands for the Marine Air-Ground Task Force (MAGTF) Unmanned Chinooks than it needs. Boeing, which Aircraft System (UAS) Expeditionary. The fiscal 2020 funding sought will pay expects to deliver the last CH-47F Block I for system architecture studies, concept of operations development and rapid to the Army by 2021 and is under contract prototyping efforts aimed at transitioning MUX to a program of record. for the first eight MH-47G Block IIs, says canceling the upgrade for the CH-47Fs MUX is a large vertical/short take-off and landing (V/STOL) UAS that is required would “hamper soldiers’ abilities to to support the Bell-Boeing MV-22 Osprey and F-35 in contested carry critical payloads,” including the up- environments. The UAS is also intended to team with the Marine Corps version of armored Joint Tactical Light Vehicle the Future Vertical Lift (FVL) Capability Set 3 — likely derived from the Army-led and extended-range howitzer. Future Long-Range Assault Aircraft (FLRAA) — which is the planned replacement for the service’s Bell UH-1Y Venoms and AH-1Z Vipers. Learn more about Future Vertical Threshold missions identified for MUX are airborne early warning; intelligence, Lift — past, present and future — surveillance and reconnaissance (ISR); electronic warfare; and communications at www.vtol.org/FVL. Included relay. The Marines would also like the Group 5 UAS to be capable of strike, airborne is the key role that VFS played escort and cargo resupply. in initiating and supporting FVL since 2008, aircraft development So far, the Marines have only operated small tactical UAS, including the Textron reports, and the 2016 RFI’s for Systems RQ-7 Shadow and the Boeing Insitu RQ-21 Blackjack fixed-wing drones. Capability Sets 1 and 3. A link to To meet an urgent need for persistent ISR and strike capability, the service the April 2019 Sources Sought plans to acquire three General Atomics MQ-9 Reaper medium-altitude, long- Notice is also included. endurance UAS.

The Block 5 MQ-9s are scheduled to become operational in fiscal 2021, and will also act as a proof of concept for MUX, providing data, lessons, requirements, tactics and procedures that the Marines expect to aid in the acquisition and fielding of the About the Author large weaponized, multi-sensor V/STOL UAS. Alan Graham is an aeronautical engineer who has been tracking the An Analysis of Alternatives for MUX began in fiscal 2018. Refinement of the draft development of aerospace technology Capability Development Document will continue into fiscal 2020, when release of for nearly a half-century. a second Broad Agency Announcement is planned and preparations will begin for the Materiel Development Decision to initiate an acquisition program.

Leading up to that, the Marine Corps plans to continue experimentation in May / June 2019 / June May support of MUX, including advanced payload and control station work and other demonstrations with the Lockheed Martin/Kaman CQ-24A unmanned K-MAX and Aurora Flight Sciences Autonomous Aerial Cargo Utility System (AACUS).

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