power 40,000 pounds of trust kind of power advanced power helping to
defend a host of Nations and the Royal Air Force with Pratt & Whitney long have been
partners preserving freedom in fact our engines have powered more than a dozen
RAF aircraft platforms over the last 80 years including the f-35b lightning
2 with the advanced F 135 engine the most innovative fighter aircraft in the world
the fifth-generation F 135 continues to redefine what's possible for our
customers and their missions because when Allied air forces like the RAF
need dependable power we listen we innovate we manufacture we go beyond
to today's game changing F 135 propulsion system our people are driven by a passion
to design and build the world's most dependable engines with the most innovative technologies
to redefine what's possible and provide our customers with unmatched capabilities
today the f 135 stove for the f-35b lightning 2 is the most advanced operational adaptive
engine ever produced able to transition between hover and conventional flight at
the push of a button and offering growth options to meet tomorrow's threats head-on
as adversarial threat systems in the 21st century continued to evolve new engine capabilities are
required to keep our customers ahead of the threat to achieve mission success now and in
the future our customers must project airpower at greater distances and overcome advanced air
defenses they need to fly farther and faster on missions that demand a seamless transition
between high thrust and fuel efficiency without trade-offs and they can't wait years for that
adaptive capability they must address evolving threats now at Pratt & Whitney we're developing
and fielding a suite of unmatched adaptive technologies at a pace that ensures our
customers have the capabilities and options they need to maintain an operational edge
today and into the future these technologies go beyond the demand modulated engine architecture
and provide options for control systems power and thermal management as well as sustainment
capabilities to meet the demands of range persistence survivability maintainability and
advanced weapon systems with Pratt & Whitney's future adaptive spiral technology approach fast
these advanced technologies can be made available to our customers faster through timely insertion
into current and future platforms at Pratt & Whitney adaptive is in our DNA it's a mindset
that begins with our people and drives us to go beyond to push the boundaries of military
aircraft propulsion to build upon our legacy of adaptive experience that spans seven decades
to enable air dominance today tomorrow and beyond go farther with adapt faster
cut and Whitney Zeff 135 propulsion system for the fifth-generation f-35 lightning ii
continues to redefine what's possible for our customers but we're not stopping there
we stand ready to take the world's most advanced fighter engine to the next level
with growth options to keep our customers ahead of evolving threats cred and Whitney's growth
options for the F 135 offer affordable variant common upgrades that can be available to all
f-35 program participants growth option 1.0 delivers a 5 to 6 percent fuel burn
improvement and a 6 to 10 percent thrust increase across the f-35 flight envelope
it also enables up to a 5 percent increased in powered lift thrust for the f-35 be very
growth option 2.0 incorporates the same fuel burn and thrust improvements as growth option
1.0 and also brings a significant improvement in power and thermal management system capacity for
the f-35 our spiral approach to next generation propulsion technologies ensures our customers
have the capabilities required to maintain the operational edge now and into the future inside
the f-35 s engines powering the fifth generation engines aboard Lockheed Martin's next generation
f-35 fighters have been almost 30 years in the making Liam Stoker takes a look at the development
of Pratt & Whitney's F 135 engine from its concept to refinement and details its performance against
foreign counterparts as various versions of Lockheed Martin's fifth-generation fighter the
f-35 approach advanced stages of flight testing the aircraft is undergoing close scrutiny from
curious onlookers one particular area of interest is likely to be its custom-built lift fan engine
developed by Pratt & Whitney using technology patented by Lockheed Martin and produced by
rolls-royce a rival to the F 135 the General Electric and rolls-royce built F 136 had been
in development up until December 2011 but was dropped after the Pentagon refused to support
further development capable of catering for the demands of all three f-35 variations while
ensuring an ease of maintenance and reduced downtime the F 135 has taken almost 30 years
of development but now looks ready to power the future fighter of the US and a host of European
nations development and origins of the F 135 engine Tora jhin's of the F 135 lion Lockheed
Martin skunk works attempts to develop a stealthy short takeoff and vertical landing stov L fighter
for the US as part of DARPA say stov L program in 1986 a concept aircraft and propulsion system
was developed and patented by Lockheed chief aeronautical scientist Paul Bevilaqua components
from F 119 and f100 to 229 engines were used to create the f-102 229 plus demonstrator engine
which went on to prove bevilaqua's lift fam concept and ultimately lead to the development
of the f 135 for use on Lockheed Martin's f-35 the F 135 team responsible for the development
of the engine consists of pratt & whitney rolls-royce and Hamilton Sundstrand through
production techniques and materials the F 135 is available at cheaper prices than the F 119
despite being a more powerful engine TW o shaft engine design of the F 135 and variations the F
135 is a two shaft engine featuring a three-stage fan and six stage high-pressure compressor the
hot section comprises an annular combustor with a single stage high-pressure turbine unit and
a two-stage low-pressure turbine the engine's afterburner also features a variable converging
diverging nozzle three engine variants have been designed the F 135 pw100 and F 135 PW
400 for use aboard the conventional and carrier versions of the aircraft respectively and the F
135 PW 600 for the sto VL variation both the conventional and carrier engines are largely
similar and produce almost identical results with a maximum wet thrust of 43,000 lbf and a
dry thrust of 28,000 lbf the major difference is the use of salt corrosion resistant materials in
the carrier variant the stov l engine however is capable of producing different results courtesy
of its design and the demands placed upon it enabling shorter vertical lift off with
the stov l f-35 variant the stov l variation of the f-35 to be used by the US Marine Corps
in UK Royal Navy used Lockheed Martin's patented rolls-royce lift system developed by rolls-royce
compost of a lift fan driveshaft to roll posts into three bearing swivel module three BSM the
system is responsible for allowing the vertical liftoff required to operate aboard some aircraft
carriers the three BSM acts is a thrust vectoring nozzle allowing the exhaust to
be directed downwards to enable vertical lift off the lift fan located towards the front of
the aircraft acts as a counterbalance by using two counter-rotating BLISK s-- unheated engine
the bypass air has been diverted to Anastas mounted on the wings of the aircraft called
the system is capable of handling 18,000 lbf of dry trust to the 3 PS M 20,000 lb
F to the lift fan and a further 3900 lb-ft both roll posts toddling 41,000
trust the system developed purposefully for the f-35 program received the Collier trophy
for achievements in aeronautics in 2001 keeping f-35s in the air reliability and maintenance one
major directive of the development of the f100 35 engine was to drastically improve engine
reliability and ease of maintenance over previous aircraft keeping downtime at a minimum one such
method was to use far fewer parts in comparison to similar engines theoretically reducing parts
failures and ensuring that all line replaceable components can be changed using a standard set
of six common tools the major leap forward has however been the establishment of the F
135 health management system which monitors the performance of the engine automatically
and provides real-time data to maintain errs on the ground this data is analyzed before maintain
errs troubleshoot n identify any necessary replacement parts prior to the aircraft returning
to base pratt & whitney has estimated that this could save as much as ninety four percent of
replacement time over legacy engines achieving the directive of reducing aircraft downtime