Engines of Innovation

All about the Pratt & Whitney F135 and the (cancelled) General Electric/Rolls-Royce F136
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spazsinbad

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Unread post19 Sep 2017, 02:30

sunstersun wrote:i don't think the f-35 B will ever take off vertically with a combat load/fuel. it's a really heavy bird.

IF correct an extra 2k lbs of fuel will help it go further (without any other load) to be fuelled / weaponized as noted.
RAN FAA A4G Skyhawk 1970s: https://www.faaaa.asn.au/spazsinbad-a4g/ AND https://www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/
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spazsinbad

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Unread post20 Sep 2017, 18:05

P&W offers F135 upgrade for depot insertion after 2023
20 Sep 2017 Stephen Trimble

"Pratt & Whitney will offer a drop-in thrust or fuel efficiency upgrade for the Lockheed Martin F-35’s engine as the fighter’s joint programme office develops options for the Block 4.2 upgrade package now scheduled to enter service in late 2023.

The Growth Option 1.0 proposal from P&W would improve the 43,000lb-thrust F135 engine’s acceleration force by 6 to 10% depending on the aircraft’s flight condition or reduce fuel consumption by 5% to extend the range of the tactical stealth fighter, P&W Military engines president Matthew Bromberg tells FlightGlobal in an interview....

...Unlike, software updates, the opportunity to accelerate engine upgrades is limited by physics and the rigours of airworthiness testing, Bromberg concedes. Instead of updates on a yearly or even semi-annual basis, P&W is proposing to offer new performance improvements as each F135 engine enters a depot maintenance period, which is generally timed in five- to seven-year intervals.

Growth Option 1.0, which P&W claimed to validate in a ground test of a full engine earlier this year, proposes to update hardware and software controls in only the power module of the F135, which contains the high-pressure compressor, combustor and high-pressure turbine, Bromberg says. P&W’s proposal calls for the JPO to fund an engineering and manufacturing development programme, but the production hardware would cost no more than the existing parts, he says. The upgrade also can be completed by the government’s depot workers.

As P&W discusses the proposed upgrade with the JPO, the company is working internally on Growth Option 2.0 package using a similar philosophy, Bromberg says. The second package also would be focused on delivering performance improvements, but stop short of inserting “third-stream” fan stage technology, Bromberg says."

Source: https://www.flightglobal.com/news/artic ... 20-441331/
RAN FAA A4G Skyhawk 1970s: https://www.faaaa.asn.au/spazsinbad-a4g/ AND https://www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/
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steve2267

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Unread post20 Sep 2017, 18:10

I thought previous stories had reported "6-10% increased thrust" and "~5% improved fuel consumption" ?

I guess it's either or now...
Take an F-16, add a dollop of A-7, a big gob of F-22, sprinkle on some AV-8B, stir well, then bake. What do you get? An F-35.
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Unread post20 Sep 2017, 20:07

steve2267 wrote:I thought previous stories had reported "6-10% increased thrust" and "~5% improved fuel consumption" ?

I guess it's either or now...


I guess it's not simultaneous in the sense that for a given fuel consumption, you get 6-10% thrust increase, while for a given thrust, you have a 5% fuel consumption improvement? :shrug:
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