In March 1999, the Congressional Budget Office reported to the Senate Armed Services Committee that JSF costs might be underestimated by as much a 50%; in March 2000, the General Accounting Office told Congress the development program should be lengthened to reduce technical/cost risks: "To allow the JSF to proceed as planned-without maturing critical technologies-would perpetuate conditions that have led to cost growth and schedule delays in many prior DoD weapons system acquisition programs."
The GAO claims DoD restructured the program so that the EMD decision will be made with even less information than originally planned, and the program has migrated toward the traditional practice of developing technologies and products concurrently. It is important to remember that the X-32 and X-35 JSF demonstrators are even more limited as concept demonstrators than was the YF-22, so the risks created by concurrency could be even greater. The winner of the JSF "competition" will be determined by a flyoff demonstrating only low-speed handling, STOVL capability, and producibility with at least 70% parts commonality; the YF-22 supersonic cruise demonstrator demonstrated aerodynamics of high-speed, high-G maneuvering, and high alpha, low-speed maneuvering in mock dogfights.
Saturday, November 3, 2012
Risks ignored with the JSF--2000
Continuing with the "what we knew, way back when" theme, below I have a PDF from Proceedings of the Naval Institute, August 2000. Chuck Spinney puts on his captain obvious hat and well, the rest is history...
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7 comments:
Dude! You're spitting in the wind. The decision has been made and the Marine Corps will be flying the jet in squadron service by the start of next year. The USAF will do the same shortly after. This is a done deal and with the Chinese copying our stuff and flying it, you can bet that more people will get on board rather than quit the program. Chairman Mao can be thanked for saving the F-35 and killing the Eurofighter and Rafale and Gripen. Even the USN will see the light. This fight is over!
The othe thing the Dem/val fly off between the YF-23 and YF-22 did was demonstrate weapon functions, including releases out of the internal weapon bays.
No such demonstration was done for the JSF!
As an Australian expert who is internationally regarded for their knowledge, skills and experience in weapon certification and clearance work said back in 2002/03, "clearing weapons out of and off the JSF F-35 will be both interesting and exciting".
"clearing weapons out of and off the JSF F-35". Is happening ...or have you somehow missed the news?
Can fully understand why you post anonymously, Dude.
Only a fool would take ownership of such idiocy.
Anonymous (Scott):
Dude! There are German Typhoons now flying around with Raptor kill marks painted on the side. The F-35 will never have the A2A moxie of the F-22 and the first time an "operational" (snicker) JSF engages a Eurofighter in DACT they'll die even faster.
Back in the land of reality the Rafale lands one of the biggest fighter contracts in history in India, and the Gripen is now flying with 5 nations + the latest Swiss order for 22 E/F Gripens bringing the number of aircraft flying/delivered to 240 vs. 16+ semi-functional F-35's delivered so far.
The J-31 is NOT a copy of the F-35 (note it has a HUD), with the Chinese letting us blunder around for over a decade with the JSF loser making all the mistakes that they've now carefully avoided, Bravo SAC (LOL)!
Considering the dismal history of the F-22 and the F-35 to date, maybe we should just skip dealing with Lockmart and let Chengdu or Shenyang design and build any future stealth fighters for the US/Australia?
At least they'd be on time and on budget vs. the hilarious JSF Program...
In the word of Napoleons Bonaparte -
Never disturb your enemy when he is making a mistake, particularly one as big as the JSF!
As for clearing weapons out of those bays.
The JSF weapon bays are the oddest shape of any bays, ever with big,barn like doors.
CFD modelling and Wind Tunnel Simulation is fine for predicting air flow behaviour and weapon release characteristics up to the mid sub sonic region of the flight envelope for 1 g flight.
Moving into the viscous flow arena where unsteady aerodynamics abound is quite a different ball game.
One of several papers worth reading can be found here:
http://arc.aiaa.org/doi/abs/10.2514/6.2011-2774
This is the kind of work that should have been informed by the Dem/Val process, at the very least, should have been done before the weapon bay design was locked into coffin corner.
@ Cocidius
I found out that the JAS-39E/F Gripen, isn’t scheduled to enter Swedish service until 2023 according to the Defense Industry daily.
Regards Peter
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