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  • ED Team
Posted

why not?

 

you may have to clarify your question

 

are you in the su-27 with radar off and you get hit with an AIM-120?

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Windows 11, NVIDIA MSI RTX 3090, Intel® i9-10900K 3.70GHz, 5.30GHz Turbo, Corsair Hydro Series H150i Pro, 64GB DDR @3200, ASUS ROG Strix Z490-F Gaming, PIMAX Crystal

Posted

OK, can you tell me what's the point putting radar off in Su-27? Is it any use in game? Well except enemy knowing you're there, but with weapons.

  • ED Team
Posted

When you are using your own radar you will show on the F-15s RWR so by having it off you are denying situational awareness.

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Windows 11, NVIDIA MSI RTX 3090, Intel® i9-10900K 3.70GHz, 5.30GHz Turbo, Corsair Hydro Series H150i Pro, 64GB DDR @3200, ASUS ROG Strix Z490-F Gaming, PIMAX Crystal

Posted

it's radar guided yes, specifically an active radar missile type. That means it has its own radar built into the missile that it uses to find you and hit you. It does not listen to the radar built into your nose at all. Another typical radar guided missile type is the semi-active radar guided missile. These look for radar reflections on the target caused by the parent aircraft radar. This is how the radar guided missiles on your Sukhoi 27 work ( R27R and R27ER). Lastly there are missiles that listen to radar signals sent by the enemy. They work the way you describe, if your radar is off they cannot see you. They are called anti-radiation missiles. they are not used against aircraft though, only against ground based anti-air missile sites.

Check my F-15C guide

Posted

Also, the radar warning receivers on all planes have dead zones where wingtips and such block sensors, and the Russian aircraft in particular are bad this way, so it's entirely possible that you get literally no warning that something is guiding a missile at you.

Posted

when a missile says it is "radar guided" it means that someone is tracking you with their radar and then the missile tracks that, not that it homes directly on your radar.

 

there are missiles like that, however i do not believe anyone has ever made one for air-to-air combat. they are used in an anti-SAM role fairly often by everyone, though.

Posted
Also, the radar warning receivers on all planes have dead zones where wingtips and such block sensors, and the Russian aircraft in particular are bad this way, so it's entirely possible that you get literally no warning that something is guiding a missile at you.

 

This is very important to remember, particularly if you're just starting out in the Su-27.

 

The SPO-15 RWR system will only detect radar signals that are within ±30° of the plane of your aircraft. Example: youir SPO-15 detects that an enemy Hawk SAM is tracking you. You decide to turn sharply to get out of the weapon engagement zone and in doing so you bank more than 30°. Because the emitting radar is >30° off the plane of your aircraft the SPO-15 will stop telling you that you've been locked up until your bank angle is back within 30° of the ground.

 

It's very easy to believe that because the SPO-15 isn't displaying a lock warning then the radar must have lost lock, when that isn't necessarily true.

 

Another way to think of it: if the vertical angle between your aircraft and the source of a radar signal is more than 30° above you or 30° below you then the SPO-15 won't detect the radar signal at all.

 

 

@Hydrox: welcome aboard! If you're new to the Su-27 it will likely seem nearly unflyable t first, but the secret to mastering it is nothing other than putting in the time, effort, sweat, frustration and perseverance. Because it doesn't have the same carefree handling that things like the F-15 have it can seem a real handful and takes far, far longer to master. But, when you do eventually master it, it's an absolute pleasure to fly and can do some absolutely amazing things that no other aircraft in DCS (with the arguable exception of the MiG-29) can ever dream of doing.

System Spec: Cooler Master Cosmos C700P Black Edition case. | AMD 5950X CPU | MSI RTX-3090 GPU | 32GB HyperX Predator PC4000 RAM | | TM Warthog stick & throttle | TrackIR 5 | Samsung 980 Pro NVMe 4 SSD 1TB (boot) | Samsung 870 QVO SSD 4TB (games) | Windows 10 Pro 64-bit.

 

Personal wish list: DCS: Su-27SM & DCS: Avro Vulcan.

Posted
I'm 100% sure I posted this this morning, no idea why it's disappeared? :O

 

This might help you on the way: http://forums.eagle.ru/showthread.php?t=150315

Take the tactics part with a grain of salt, but the systems are very well explained!

 

A definite +1 for Santi's Su-27 guide. The only thing that I take exception to is that the R-27ER is described as slow and sluggish when in fact it's one of the fastest and fastest accelerating missiles in the entire DCS world: I've seen an R-27ER reach over 4,200 Km/h - a speed that no AIM-120 will ever hope to reach.

System Spec: Cooler Master Cosmos C700P Black Edition case. | AMD 5950X CPU | MSI RTX-3090 GPU | 32GB HyperX Predator PC4000 RAM | | TM Warthog stick & throttle | TrackIR 5 | Samsung 980 Pro NVMe 4 SSD 1TB (boot) | Samsung 870 QVO SSD 4TB (games) | Windows 10 Pro 64-bit.

 

Personal wish list: DCS: Su-27SM & DCS: Avro Vulcan.

Posted
A definite +1 for Santi's Su-27 guide. The only thing that I take exception to is that the R-27ER is described as slow and sluggish when in fact it's one of the fastest and fastest accelerating missiles in the entire DCS world: I've seen an R-27ER reach over 4,200 Km/h - a speed that no AIM-120 will ever hope to reach.

 

wait what!!! how do you get an R-27 to go that fast

[sIGPIC][/sIGPIC]

Posted

4,200km/h is 2,200kts...Not that hard for an AMRAAM at high alt IIRC.

 

The ER has a lower fly out time at high alt though.

Lord of Salt

Posted
4,200km/h is 2,200kts...Not that hard for an AMRAAM at high alt IIRC.

 

The ER has a lower fly out time at high alt though.

 

The ER definitely has a speed advantage at high altitude. It's not massive, but it is noticeable.

[sIGPIC][/sIGPIC]

Posted
wait what!!! how do you get an R-27 to go that fast

 

This is purely from memory, but I think I launched an R-27ER against a KC-135 at around 20 Km. I was at around 7,000m and the target was down at around 2,000m. Launch speed was a hair under 1.2M

 

At the point at which the sustainer burned out the speed of the missile as reported by F2 view was I think 4,219 Km/h.

System Spec: Cooler Master Cosmos C700P Black Edition case. | AMD 5950X CPU | MSI RTX-3090 GPU | 32GB HyperX Predator PC4000 RAM | | TM Warthog stick & throttle | TrackIR 5 | Samsung 980 Pro NVMe 4 SSD 1TB (boot) | Samsung 870 QVO SSD 4TB (games) | Windows 10 Pro 64-bit.

 

Personal wish list: DCS: Su-27SM & DCS: Avro Vulcan.

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