The 'very long thread' has a lot of jabba about SRVL and here is onesuch:
http://www.f-16.net/index.php?name=PNph ... c&p=183985 [scrill din]
JSF To Develop Landing Technique For U.K. Carriers Oct 15, 2010 By Graham Warwick
http://www.aviationweek.com/aw/generic/ ... adline=JSF [NO LONGER WORKS]
"While the future of the U.K. Royal Navy’s two new aircraft carriers is uncertain, Lockheed Martin has been awarded a $13 million contract to incorporate shipborne rolling vertical landing (SRVL) capability into the F-35B for the U.K.
SRVL will increase the payload that the F-35B can bring back to the carrier by 2,000-4,000 lb. above what is possible with a Harrier-style vertical landing, reducing the need to dump unused weapons or fuel before recovery.
The maneuver involves landing at a slow forward speed so that some wing lift is available to supplement lift provided by the short-takeoff-and-vertical-landing (Stovl) propulsion system...."
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Contracts NAVY 06 Oct 2010
http://www.defense.gov/contracts/contra ... actid=4382
"Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Ft. Worth, Texas, is being awarded a $13,035,539 modif-ication to a previously awarded cost-plus-award-fee con-tract (N00019-02-C-3002)
to incorporate the shipborne rolling vertical landing capability into the F-35 Joint Strike Fighter for the United Kingdom. Work will be performed at Fort Worth, Texas (54 percent); Warton, United King-dom (35 percent); El Segundo, Calif. (7 percent); & Orlan-do, Fla. (4 percent).
Work is expected to be completed in October 2013. Contract funds will not expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Md., is the contracting activity."
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Date Posted: 11-Dec-2008 International Defence Review:
http://militarynuts.com/index.php?showtopic=1507&st=120
Preparing for take-off: UK ramps up F-35 carrier integration effort [EDITED]
“A range of simulation, modelling, risk-reduction and technology-demonstration activities are under way to optimise the safety and operability of the ship/air interface between the UK's new aircraft carriers and the F-35B Joint Strike Fighters that will operate from them. Richard Scott reports....
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SRVL manoeuvre
As currently conceptualised, an aircraft executing an SRVL approach will follow a constant glidepath (five to six degrees) to the deck. This angle is about twice that of a normal CV approach, offering increased clearance over the stern and less touchdown scatter. The touchdown position on the axial flight deck is about 150 ft from the stern, similar to that of a conventional carrier. No arrestor gear is required. Instead, the aircraft brakes are used to bring the aircraft to a stop. Low-key studies to investigate the SRVL technique were initiated by the MoD in the late 1990s, but the work has latterly taken on a much higher profile after the MoD’s Investments Approvals Board (IAB) in July 2006 directed that SRVL should be included in future development of the JCA design to mitigate the risk to KUR 4. Accordingly, the JCA IPT amended the CVF integration contract in mid-2008 to include this requirement. Addressing IPLC 2008, Martin Rosa, F-35 technical coordinator in Dstl’s air and weapon systems department, said the
SRVL studies to date had shown “a way forward exists to achieving operationally useful increases in bring-back, compared to a vertical landing, on board CVF with an appropriate level of safety”.
Dstl began early work to examine the feasibility of employing the SRVL manoeuvre in 1999. According to Rosa, an initial pre-feasibility investigation demonstrated the potential payoff of the manoeuvre in terms of increased bring back, but also threw up four key areas demanding further examination: performance (as affected by variables such as deck run, wind over deck, aerodynamic lift and thrust margin); carrier design; operational issues (such as sortie generation rate); and safety.
Further feasibility investigations were conducted in 2000-01 using generic aircraft and ship models.
Dstl also ran a two-day safety workshop in late 2001. This showed that there were no “showstoppers, and no SRVL-specific safety critical systems were identified”, said Rosa. “Also, the ability to ditch weapons and carry out a vertical landing instead of an SRVL in the event of a failure was seen as a powerful safety mitigation.”
During 2002, more representative F-35B information became available which altered assumptions with respect to aircraft ‘bring back’ angle of attack (from 16 degrees to about 12 degrees, so reducing the lift co-efficient); wing area (revised downwards from 500 ft2 to 460 ft2, reducing lift available on approach at a given speed by 8 per cent); and jet effects in the SRVL speed range (which were significantly greater than those in the hover).
Aggregated, these revised assumptions significantly reduced predicted bring back performance. Even so, the improvement offered by an SRVL recovery was still substantial and MoD interest continued. In the 2003-04 timeframe, Lockheed Martin became formally engaged in the investigation of SRVL recovery, with the JPO contracting with Team F-35 for a study into methods for Enhanced Vertical Landing Bring Back. Once again, safety and performance characteristics were considered broadly encouraging. “However,” pointed out Rosa, “at this stage work on the adaptable CVF design was progressing rapidly.... Consequently the obvious next step was to consider the detailed impacts that SRVL might have on the CVF design.”
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FARNBOROUGH: BAE to ramp up work on JSF production - By Craig Hoyle - 13/07/10 - Flight International
http://www.flightglobal.com/articles/20 ... ction.html
“...Considerable work has already been conducted to prepare for the UK’s future operation of the F-35B. Qinetiq’s VAAC Harrier test aircraft supported the development of its flight control laws, & also tested a shipborne rolling vertical landing (SRVL) technique. This will enable the STOVL type to return to the carrier’s deck at a greater landing weight [than mandated KPP described earlier],
allowing unused stores to be kept on the wing, rather than jettisoned before landing. [However there would be permutations and combinations of stores both internal and external that would require NATOPS advice about how to proceed - and if all else fails - jettison the stores and there would be a 'fail safe' mechanism to do this as well.]
Developed for the UK as an alternative to making a vertical landing, the concept also has the backing of the USMC, which plans to adopt the procedure when operating its F-35Bs from the US Navy’s Nimitz-class aircraft carriers. Now installed at Boscombe Down in Wiltshire, Qinetiq’s simulator for the VAAC Harrier – being adapted for additional use by the Empire Test Pilots’ School – perfectly demonstrates the generational advance brought by the F-35B.
Flying an approach to the RN’s new aircraft carrier in sea state six should be a daunting prospect for a novice pilot. But a single button press slows the aircraft to 60kt (110km/h) and automatically configures its flaps and nozzle deflection, making it a matter of merely flying an approach angle of 6-7° towards a series of white lights on the deck. Such design traits go to showcase the F-35B’s attraction for military user and industry alike. Each of the Royal Navy’s ski jump-equipped Queen Elizabeth-class aircraft carriers will be able to carry up to 36 F-35Bs...."
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F-35B starts critical tests in comeback attempt Stephen Trimble 05
Oct 2011
http://www.flightglobal.com/news/articl ... pt-362941/
"...Meanwhile, programme officials also appear to have resolved a 90.7kg performance shortfall in the vertical lift bring-back weight of the F-35B in hover while returning to a ship. Engine manufacturer Pratt & Whitney has confirmed the solution includes raising the output of the propulsion system by about 100lb-thrust (0.4kN)...."