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haavarla wrote:Ironic isn't it.. The Russians develop and produce TVC. But they do not use it them self, well until now they do(Su-35S and Su-30SM).
But yes, TVC nozzles do increase service cost. IMO the jets will have more down time. It cost extra bucks and with increase weight.
With a 3D TVC its even worse..
haavarla wrote:I beg the different. The TVC in MKI, Su-35S and T-50 works just as well for supersonic trim.
They move in pitch, but at a diffferent angle, \ /. No problem what so ever. The actuall movment for nozzles trim, is very small deflection.
3D wouldn't improve supersonic performance, but add weight.
linkomart wrote:3D wouldn't improve supersonic performance, but add weight.
Not quite that simple, unfortunately. TVC in the yaw axis (wether you call it y or z or...) CAN help you if you got stability problems at high Mach numbers. The yaw stabilizing effect from the fin is often reduced at high mach due to aerolastic effects, and if the structure is weak the reduction can be substantial. This means that the fin needs to be sized to meet high mach stability requirement, adding drag and weight. If you can use TVC to stabilize the aircraft at high mach, the fin might be reduced in size.
That said, it all depends on what design you have, so your conclusions may vary. I have not seen a TVC system worth the effort, but as I said, it's not that simple.
my 5 cent
neurotech wrote:Part of the justification for the Su-30/35 tailfin size is the aerodynamics at high-alpha. The T-50 fins are further separated, so the smaller vertical stabilizer would stay effective at high alpha. The F/A-18 & MiG-29 have LERX vortex generators that also assist in vertical stabilizer effectiveness. That said, I'm not an expert at aerodynamics, as I was on the avionics side of things.
So i challange your "more Cons, less Pros"..
ericchase88 wrote:Those little protrusions are very small compared to T-50 LEVCON. It won't help F-22 generate nearly as much helpful vortex and lift as T-50.
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