Su-39 needs two R-77s on the current two R-73 pylons.
(I found an image of R-27 installed on the central pylon, but I failed to find that central pylon also can equip with R-77.)
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Because the Su-39’s top speed is a little lower than the AV-9B Plus Harrier.
(Approximately 1050km/h at low altitude.) -
The Su-39 is also less maneuverable and can’t make the same sharp turn as the Harrier.
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Su-39 is very hard to destroy enemy fighters in 11.3 br with R-73.
Because Su-39 can’t reach the mach 1, So Hit&Run is hard to succeed, and planes that can’t reach the mach 1 are very unlikely to take the initiative in combat. -
The Su-39 must be equipped with a Kopyo radar pod with drag in order to operate a radar missile.
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Of course, being able to shoot two R-60Ms and two R-77s at 11.3br is too unreasonable, so if Su-39 takes two R-77s, the plane must go up to 11.7-12.0.
(I’m not sure what BR will be fine to go if the Su-39 is equipped with 2 R-77s in Ground RB.) -
In ground realistic battle, Su-39s are forced to fight very unfavorable air battles if enemy team has planes that can reach mach 1&having PD Radar + Radar Missiles at the same time.
In my experience, the only way to kill an enemy plane as riding Su-39 is to use radar to find the enemy, turn off the radar, fly to expected enemy’s direction, and then launch an R-73 surprisely.
Or when I doing dogfight against the enemy, the only way to success is If the enemy made a big mistake, so when my overshoot succeeded, firing R-73 to enemy.
- Launching R-77s which have enormous drag due to the presence of grid pins from slow planes makes long-range BVRs really difficult.
I’m so sorry. Giving R-77s to Su-39 is wrong and bad idea.
I’ll explain you why.
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Some 11.0 br aircrafts have trash RWR.
(For example, MiG-21 Bis)
MiG-21 Bis has not so many countermeasures, and most important part is MiG-21 Bis’ RWR is trash.
So If MiG-21 Bis meets the enemy who firing R-77 will be too painful. -
In 12.3 br, AV-8B Plus has 4 AMRAAMs, but Riding that Harrier in 13.0br is not so funny.
So If Su-39 goes up to 12.3 with only 2 of R-77s, then it will suffer pain more than Harrier.