speedbird5

Developers, please see this thread for problem description... http://forums.eagle.ru/showthread.php?t=151735 i posted it here as well because the rudder authority for the F-15C has been changed in DCS 1.5..... http://forums.eagle.ru/showthread.php?t=147601

This is a suggestion on how the ILS implementation might be improved in the Flaming Cliffs F-15 and other aircraft where an ILS frequency cannot be tuned on an ILS receiver. 1. Survey all ILS serving all runways in DCS and ensure that their glideslope is 3 degrees, the GPI (glideslope point of intercept) is 1000 feet from the threshold and the TCH (threshold crossing height) is 50 feet. This is the standard real world implementation. 2. For aircraft where it is not possible to tune an ILS frquency and set a front course (such as the F-15C), then perhaps a Navigation Menu should be implemented so that you can select the airport, then select the runway and then the ILS for that runway. 3. Implement a unique identifier for each ILS which displays on the HUD. For example, the ILS at Batumi might have an identifier such as IBAT (In the real world, this is how ILS are identified e.g the identifier for Runway 28L in KSFO, is ISFO) . If a runway has an ILS at each end then unique identifiers would have to be assigned.

The F-15C ILS Glideslope on the ADI is showing fly down command when HUD showing on Glideslope. I have tested this at Batumi, Vanziani and Sochi. All show the same thing. Screenshot attached

Great find Pete. This would confirm to me that they might have mucked things up when they increased rudder authority in the F-15C: http://forums.eagle.ru/showthread.php?t=147601 I did the same as you and tried numerous high speed aborts in 1.5 for testing and could not keep it straight. I have never tried DCS1.2, only 1.5. Is it possible to have both installed at the same time? If so, how did you do it?

No, it's not the Saitek Combat pedals. You answered it yourself when you said ..." But, I certainly don't have this issue in other sims. " As I said in my original post, in the VRS Superbug in Prepar3D, these pedals allow me to apply max braking at 140 knots on touchdown and apply rudder and I have no problem staying straight. I certainly agree they need to fix this.

Hmmm. This leads me to further suspect it needs changes to the flight model. As I stated in my original post..... Do you use your CH rudder pedals with FSX or P3D with the VRS Superbug or other aircraft? If so, can you apply braking and rudder on landing at very high speeds and can keep the aircraft dead straight ?

I also found that you can only place the landing waypoint halfway down the runway and not at the threshold. It's funny, but I fly exclusively with the HUD and that is what i was doing in the screenshots, I didn't even look at the ADI. I will try an approach using the raw data on the ADI.

Pete, I do not use the flight planner for an ILS. I just use the ILS function by being in NAV mode and pressing 1 on my keyboard to bring up the crosshairs. Here is a track of an ILS at Sochi and some screenshots over the threshold and the touch down point. In this exercise I am merely following the G/S down to TD to see where I end up. The pre-saved mission is one I use for landing practice. I start at about 1000 feet and it takes me a little time to get into the slot. The tracks seem to be working again. Make sure you have version DCS 1.5.1.47025. You should be able to pause the track at any stage. The first and second screen shots are over the threshold. The third and fourth are at touchdown. As you can see the TCH is about 60 feet (Sochi is about 100 feet elevation) but the TD point is a fair way in. (You probably know this, but to play my track, just save the track to your desktop and then double-click on it and DCS should open with the track loaded) Would be interested to know if the track played back accurately on your setup. F-15 landing.trk

I don't think the ILS implementation is that precise with respect to a TCH of 50'. I use the G/S down to about 300 feet and then select and maintain an aim point on the 500' markers with the VV. As the threshold disappears under the nose I flare and put the VV on the horizon. I notice in the change log here http://forums.eagle.ru/showthread.php?t=147601 that they say for the F-15..... F-15C Infinite fuel after aerial refueling has been fixed Transonic Roll-off eliminated Wing rock effects implemented Rudders have more authority Could this change have affected the ground handling characteristics ?

I have come to the conclusion that the simulation is deficient in it's modelling of rudder sensitivity and damping in the landing roll above 50 knots. It is quite unrealistic in that regard. No amount of tweaking of the axis curves can fix it. I think it needs changes to the flight model which are beyond the user's reach. Pete, if you perform a landing as per the Belsimtek flight manual with respect to AoA to touchdown and use aerodynamic braking to get your speed below 100 knots, then de-rotate, place the nosewheel on the runway and then, without touching the brakes, allow the aircraft to slow to 50 knots, you can then confidently apply brakes and it will keep straight.

Tracks are broken in 1.5. The track has me landing on the grass to one side of the runway. The nose-wheel would not have a braking system attached, therefore no anti-skid. All the aircraft I have flown in real life (C130H Hercules, Falcon 900 and B737 classic and NG) have anti-skid on the main gear wheels only.

Hi all, I have excessive rudder sensitivity in the FC F-15 and DCS 1.5 with Saitek Combat rudder pedals on landing. My toe brakes are set up so that if you apply braking, it applies braking to both brakes evenly - just like pressing the W key. I have tried setting the toe brakes individually and the problem persists. Now, I don't want to get into a discussion about correct landing technique in the F-15. I know and use the precise technique as per the flight manual and if I allow the aircraft to slow, without touching the rudder pedals or brakes, and then apply brakes below 50 knots directional control is OK. However, one should be able to apply the brakes at 100 knots and not lose directional control. On landing, when I apply the brakes at about 100 knots with the nose-wheel on the ground, if the nose of the aircraft diverges slightly from centre-line, then any rudder input to correct it causes the nose to over correct and I end up losing directional control and cannot keep it on the centre-line. I can only successfully apply braking and rudder below 50 knots. I have searched the forums at length and nothing seems to solve the problem. I have adjusted the axis tuning extensively and no luck. In Prepared3D with the VRS Superbug, the rudder and braking control is perfect and you can apply braking and rudder on landing at vey high speeds and can keep the aircraft dead straight. I have verified the rudder controllers are recognized by Windows game controller settings. Can someone with these rudder pedals and the FC F-15 verify that if you de-rotate on landing at about 100 knots, and put the nose-wheel on the ground, and you apply brakes, can you keep it dead straight from 100 knots to a full stop with rudder control and braking? If you can, then can you share your axis settings for both the rudder and the toe brakes and whether you have individual toe brakes set. I am trying to determine if there is a setting in DCS which works for these rudder pedals. My current rudder axis setting is attached. I do not use the Saitek SST software.