Military Forum for Russian and Global Defence Issues
GarryB wrote:I would think if they developed stealthy sawtooth engine nozzles that they could fit them to either engine... as both would probably benefit wouldn't they?
Stealthflanker wrote:Isn't the radar blocker already part of the plan from the day 1 of Su-57's inception ?
kvs wrote:william.boutros wrote:Isos wrote:
This image settles that the fans will be visible and that blockers need to be installed.
Only if the radar is located above the plane of the jet. For any ground radar they are invisible. As for being detected in
the air by other jets, that was never the objective of stealth.
Gomig-21 and LMFS like this post
Isos wrote:kvs wrote:william.boutros wrote:Isos wrote:
This image settles that the fans will be visible and that blockers need to be installed.
Only if the radar is located above the plane of the jet. For any ground radar they are invisible. As for being detected in
the air by other jets, that was never the objective of stealth.
It's the opposite. If the enemy radar is above the su-57, its signal will bounce on the wing and never go inside the engine.
If it is bellow the su-57, the signal will go inside but will bounce ten times before coming back.
The only time the radar's signal will go inside and bounce on the engines is when the radar is at the same altitude.
But even then, su-57 will be supercruising so the air intakes of the engine will be smaller, and the radar blocker will have two fonction. From what I understood it will be similar to this drawing with the radar blocker being the movable part in front of the engine.
Isos wrote:I shared the graphic to show that the intake must be smaller at supersonic speed for air flow not for radar.
Su-57 will have a radar blocker that will also control de air flow. And it will be placed like the moving thing above the "auxilliary door" on the graphic.
But yes that graphic has nothing to do with su57. It's about Concorde.
thegopnik likes this post
Isos wrote:Again that's just what I undertood. I never saw anything in english or real pictures of them.
Anyway the design is already hiding half of the engine. But like Garry said the little amount of signal going in will bounce multiple times in the intakes made out of stealthy design and will be absorbed so much that it won't have any power to go back to enemy radar. And that's only if the enemy radar is at the same altitude which won't be the case most of the time and the su-57 can just go bellow 500m and hide the intakes with the wings...
jaguar_br likes this post
jaguar_br wrote:When is this photo from?
Unlike prototypes and even serial, this mock-up has a serrated radome... Did they find it unnecessary?
Stealthflanker wrote:Regarding serrations It's not necessarily need to be visible in final production. It can be internal.
LMFS wrote:
In fact the radome for the Su-57 appears to be different to that of other models until now. AFAIK serrated edges are needed where there is an electrical discontinuity in the fuselage, those panel covers that do not need permanent access can be closed so that continuity is not lost. Maybe the increased reliability of the AESA makes frequently accessing the radome and hence serrated edges unnecessary?
LMFS likes this post
Stealthflanker wrote:It would still be needed mainly to give better sidelobes for the antenna and perhaps part of edge treatment against structural mode RCS. There still be discontinuities present however as the radome and airframe is made out of different materials. But this can be handled by something like RAM tapes or coat to weaken or absorb the diffraction RCS. Same goes for the canopy supporting frame.
GarryB likes this post
LMFS wrote:Combat Approved, finally in English: the Su-57 especial
JohninMK wrote:LMFS wrote:Combat Approved, finally in English: the Su-57 especial
Ever wondered why they gave it the number 57? How about this?
at 20:30 the guy says "if you add 22 and 35, you get 57"
Isos wrote:JohninMK wrote:LMFS wrote:Combat Approved, finally in English: the Su-57 especial
Ever wondered why they gave it the number 57? How about this?
at 20:30 the guy says "if you add 22 and 35, you get 57"
Because su-27/37/47 exists. Next one was 57. The other number are for derivatives like 30/33/35 or 25 for CAS. I think they keep the numbers in 7 for all new fighters since the 27.
Maybe because 7 is a lucky number.
GarryB, medo, magnumcromagnon, Big_Gazza, tanino, JohninMK and Gomig-21 like this post
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