TaiidanTomcat said:
Much like the swim in a triathlon, you don't win with a great swim, but you lose without it. Thats the future of stealth. In the future you may not be able to win with it alone, but without it you lose. its one more thing that top tier fighters must take into account. Which is where things are now if you look around at the J-20 and Pak Fa and F-22. If you are talking about being a viable 21st century warplane you better have stealth.
Stealth, like triathlon, is far more nuanced (see Chrissie Wellington, Greg Welch, Norman Stadler, SENIOR TREND, etc.).
The outer mold line of an aircraft is only a small part of it's *operational* signature. The B-2 and F-117 had excellent results on the pole, but that did not translate to real world mission success without the support of infrastructure like excellent mission planning tools - somewhat like really nailing your nutrition in a triathlon to prevent disaster late in the race. Both of these platforms used mission planning tools (and in the case of the B-2, a defensive management system) which presented the optimal signature to threats. Signature data came from sources like in flight signature measurement of individual aircraft using assets like DYCOMS and the NT-43 or AIRSAR, as well as on the ground signature measurements from systems like CLOVerS.
The F-35, in contrast, relies on ALIS, which is strictly a model-based toolset. It does not perform actual measurements of the aircraft signature. Only one operator of the F-35 has the infrastructure in place (or planned) to support signature measurements on flight or on the ground, and it is unlikely that the operator would be able to handle the volume of anything but a small force.
ALIS signature data is explicitly not allowed to be used for mission planning, there are actually directives indicating as such (I do not have those handy at the moment).
There are many, many interesting papers and reports on finding the optimal route through defended airspace for VLO/LO aircraft. Strangely, it does not look as though the F-35 program is planning to make that part of the package.
- Mission planning system will not be using signature data from real world measurement of the aircraft performing the mission
- ALIS signature estimates from model are not to be used for mission planning - if mission planning system will be using signature data, it must come from a more general model of the aircraft type and configuration.
So either the aircraft has some extreme, all aspect, broadband stealth that makes these kinds of support moot(!), or... it doesn't and does not need it (Hmm...).
It's also noteworthy that only three countries have a full scale dynamic RCS measurement capability.