BlackPixxel

Maybe you used the 'normal' miles instead of nautical miles for your conversion.

R-27R/ER DOES have variable PN (sort of) Chizh said that the stupid R-27 does not have variable PN guidance. This is not entirely true. It appears to have fixed PN coefficients during the stage where the seeker is in semi active homing mode, which starts when the missile is 25 km from the target when a typical fighter jet is engaged. The required overload of the missile calculates as follows: If the missile is launched at the target between 25 km and 1.5 * 25 km (37.5), then the initial flight of the missile will be done using inertial navigation. During this stage, the overload calculation is done differently: Note how the navigation factor of 4 gets divided by the term T*. T* is a time that is depending on the speed of approach between missile and to the target, the estimated range between missile and target and the seeker lock on range (25 km). For a fighter sized target, this term will basically calculate the estimated time that the missile still has left until it gets within 0.8*seeker range = 20 km to the target. The division by the term results in the missile gets commanded to pull less and less g, the further it is away from the target. For launch ranges beyond 37.5 km for a fighter sized target, the weapon system of the launch aicraft will support the missile with radio correction updates until the missile is estimated to have reached the range of 25 km to the target. The formula (4.3) is used again. (Note that it looks as if the top left of the first term would say "4 D". It is actually 4 times the derivative of D, the dot is just overlapping with the text above). Note how the text is basically saying: "The first term should be interpreted as a navigation constant for the proportional guidance method depending on the range D." We have a range (and rate of change of range = speed of approach) dependent term that will cause the missile to pull less g the further away it is from the target. The amount of g that the missile will be asked to pull increases the closer it gets to the target. When it is 20-25 km to the target, it will switch back to the larger, fixed navigation constant of 4 that is seen in formula (4.2). Conclusion: For long range shots, the missile will effectively use variable PN coefficients, which will result in less speed loss due to the missile doing smoother turns with less g-loadings. So in contrast to what we hear from Chizh, the R-27 does have variable PN.

It is clearly not a Su-30, as it has the single seat cockpit. But that picture looks like it is from a manual from some plastic model, so not really a reliable source for aircraft loadouts. Especially when it shows ET's on all 8 inner stations. (Although ET can be used on non-cooled stations as well with a backup mode of the seeker)

When the target notches the radar the missile should keep its current path, but in DCS the R-27 turns instantly towards the last known targets position. I expect this to change when they apply the new autopilot logic to R-27.

Is there a way to download the files directly without using the apparently bugged updater?

It always gets the error when downloading Syria.surface5

Any fix for this? I am unable to download it, it will always interrupt because of some hash error or some firewall/antivirus thing message, which I have disabled.

I am also unable to download Syria:

[100☭] BlackPixxel - Red cmdr (rain)

It will depend on the launcher (and maybe distance to target, as the missile gets an additional command if the target is very close). ~1.5s for catapult launcher, ~0.4s for rail launcher. But in DCS right now it somehow depends on the rocket motor type. ~1.5s for E-missiles, ~0.4s for non-E-missiles If it was properly implemented R-27T and R-27ET should always have the shorter safety maneuver, as they will only be launched from the rail.

That would be a pretty cool feature. It would also be nice if they would finally fix the incorrect signal strengths that the SPO-15 shows right now. F-18 and JF-17 for example show with a much higher strength than a F-14 at the same range.

2:40 in this video shows a modified R-27R. Note the green proximity fuze antennas.

nvm

Notching should not really depend on RCS

Notching should not depend on RCS

In this video you can see very often how he is unable to keep the nose in a straight line, it is always pumping up and down. What makes it so difficult to fly precisely is that it feels like 95% of the stick travel is for trim, and 5% are actually used for the full maneuvering around the trim center. When landing, tiny movements of the stick make the plane go up and down by alot, which makes it harder to touch down smoothly than with any another plane. Not sure if this is correct or not, but this is the simple reason why the MiG is so weird to fly in DCS.

Also, note how it has some memory/extrapolation even in close combat modes. In DCS exceeding the gimbal limits of the sensor in any mode other than BVR will result in an instant loss of lock. But in the video you can see how the IRST is trying to scan the area of the last known position as good as it can (it of course cannot reach it, as it cannot look that far below the nose).

This is the placeholder texture. I have the same issue. Looks like that part is not textured, or something went wrong.

This is very good news and will be very appreciated by the redfor players! Is there any difference beside the higher off-boresight angle when firing compared to the current R-73 in DCS? When do you think is the implementation of the missile into DCS to be expected?

Yes, HOJ has always been there, but with a worse guidance (it was pure pursuit) which made it less effective. The missile also had reduced burn through ranges when going active. Now the HOJ guidance is perfect, making ECM useless. Also it is questionable whether an unsupported missile will identify a suddenly appearing jammer as its original target.

Will an improved effect of ECM be implemented for the new Aim-120 autopilot? Right now ECM makes the missile perfectly track the target from any distance. An Aim-120 can be launched on a non-jamming target, the shooter can turn his radar off. If the target now starts jamming, then the unsupported Aim-120 will instantly snap to that jammer and start guiding to it with lead pursuit. This makes ECM 100% useless, as it improves the Aim-120 guidance.

MaxMPower, the russian Su-30SM/Su-35 pilot, wrote in this forum that the R-27ET is also used in offensive combat.

The R-27P/EP can engage targets that maneuver with up to 5.5g. Looks more than good enough to track a non-suspecting fighter. It is even advertised for such operation.

You can see it on the images I posted. They show what the datalink packets look like. It is sending a vector that is the absolute change as well as a vector that is the rate of change. This is done because sending the absolute change with a fast moving target would consume much more bandwidth. With this method only smaller numbers have to be sent, and less bits are required. These datalink messages will constantly update the initial position of the target that was given to the missile when it was launched. When datalink is used, the missile is flying in a stabilized coordinate system, where it is using its inertial sensors and gyros to track its own position, and the datalink to update the position of the target.

And the correction vector and the rate of change (target speed vector) is sent via datalink every second, not just the pure angular coordinates to the target as you wrote earlier.