Ракеты в DCS

[Sindar]

13 часов назад, Chizh сказал:

Дальность захвата пассивной ГСН зависит о мощности радара, режима работы, уровня боковых лепестков

Вот даже интересно на что она будет наводиться, когда диаграмма антенны будет ей светить ей нулём между главным и боковым лепестком 

7 часов назад, FoxAlfa сказал:

Basically if you can do something that makes the target drop the lock/missile is quite useful in the late 80's time frame, if it kills it is a bonus if it happens. 
until Fox 3s and TWS launchers few years latter made it obsolete... thus no wide adoption or real world use latter...

In TWS mode, does the radar emit nothing? Or does it emit on 10 different operating frequencies? Any radiation in the forward hemisphere would be a target for a passive . And a towed jamming transmitter would be a target too. Just like the sun is a target for IR missiles.

Edited January 28 by Sindar

[Chizh]

13 часов назад, MA_VMF сказал:

для Р-27ЭП, это не проблема

Да, да. Волшебная Р-27П может захватить даже не работающий радар на дальности около 100 км. )

13 часов назад, Кош сказал:

Это уже 20 лет как не новости.

Одно дело детектировать LPI мощным современным комплексом РТР. И совсем другое - древней пассивной ракетой без ЦВМ.

[okopanja]

7 hours ago, TotenDead said:

Носители амраамов хоть раз сбивали этими ракетами хоть что-то в TWS?

Yes, Hwang is credited shooting down Peric/Radosavljevic while using TWS in 1999. He and the wingman fired 4 AIM-120.

We know since Mike Shower criticized junior pilot for heading to a merge in TWS. It worked well, since both Perić and Radosavljević were trying to climb 7000m.

I did not publish this story yet, but you can find in English section of Mig-29 FF module 4 encounters I translated. For this particular flight it will take a longer time, since Peric did provide lots of details.

Shower himself merged twice with 29s on first evening:

1. He fired on Nikolic he AIM-120 and Sparrow at 14nm, followed by 1 more AIM-120 at around 5nm, since first 2 missed

2. He fired on Kulacin another AIM-120, which also missed

He used STT.

Unlike Hwang, Shower faced 2 low flying Mig-29.

Edited January 28 by okopanja

[MA_VMF]

1 час назад, Chizh сказал:

Да, да. Волшебная Р-27П может захватить даже не работающий радар на дальности около 100 км. )

Про не работающий речи не было

[okopanja]

2 hours ago, Sindar said:

Вот даже интересно на что она будет наводиться, когда диаграмма антенны будет ей светить ей нулём между главным и боковым лепестком 

In TWS mode, does the radar emit nothing? Or does it emit on 10 different operating frequencies? Any radiation in the forward hemisphere would be a target for a passive . And a towed jamming transmitter would be a target too. Just like the sun is a target for IR missiles.

This depends, I would expect from such weapon to be able of sort of selectivity. E.g. being able to stick to the specific radar in TWS would be hard requirement for soviet electronics in 80s, unless they relied on western components.

The next candidate would be: any radiation within selected 1GHz band from 8-12GHz on last extrapolated angular position. E.g. you do not care much about the signal as long as it is in the expected volume of space. 

As for jammers we kind of have an air-HARM against jammers: LD-10 will prefer jammer to actual radar in active mode.

 

[Xhonas]

Hello guys, something interesting that i noticed in DCS is the range of the Aim-120, and basically other missiles as well, when you're flying very high, 50 to 60k feet, basically every missile is limited by its battery time instead of aerodynamics. Take these examples below: 

Missile is lanuched at a target 80nm distance

Peak speed is mach 4.22

But impact speed is mach 3.35!! So, it means that the missile is capable of flying way, way further than this.

Edited January 28 by Xhonas

[Xhonas]

At the same time, for a target flying at mach 1 and missile fired at 70nm, impact speed is 3.15

 

Edited January 28 by Xhonas

[Chizh]

21 минуту назад, Xhonas сказал:

Hello guys, something interesting that i noticed in DCS is the range of the Aim-120, and basically other missiles as well, when you're flying very high, 50 to 60k feet, basically every missile is limited by its battery time instead of aerodynamics.

Not quite so. Radar missiles are most often limited by the ability to lock onto a target at the desired point. Then the longer the missile flies, the INS accumulate more errors. At long range, the probability that the target will be in the missile's field of view decreases.

 

[tavarish palkovnik]

From kinematic point of view and mechanical perspective, most of rockets and its trajectories can be, with basic knowledge, quite precisely determined…up to 10km altitude, maximally 15km depending of motor potential. Above this zone, circuses starts and most of linearity that could be used or counted on at lower altitudes, over there stops. Mistakes or better to say miscalculations measured in 15-20% just by overlooking some initially considered as irrelevant details can happen easily.

Depending of nozzle and chamber pressure thrust can be significantly increased, depending of configuration drag coefficients can be significantly increased due to friction, atmosphere conditions if deviates from standard atmosphere, and it does normally, bring changes measured in easily 10-15%. With high altitude and rare atmosphere, angles of attack becoming bigger and bigger, and depending of rocket configuration this last is starting to be the first factor for determining zones.

In these few “launches” of mine, stability was main factor for shortening zones, sometimes significantly and rapidly 

 

[Serafim51]

 

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