OverStratos 3rd Party Developer



Join Date: Sep 2015 Posts: 569

DCS MiG-19P Status update_First report Hello pilots,



First of all, please excuse this non English speaker if any typos slip through his revisions…



1) Known flight model issues of the MiG-19P as of release are:

Stall behavior lacks some features characteristic of aircraft stalls. Like, aircraft vibration at low speed and AOA and roll of the wings in dependence of how much the stick is pulled and a subsequent drop of the nose. Impossibility to get into Spins.

Thrust at MIL setting too high, causing the aircraft to super-cruise.

Incorrect tuning of the MIL engine setting in a specific RPM range.

Lack of airframe damage because of excessive G overload and overspeed.

Lack of external stores rip-off with the aircraft pulling more than 5Gs.

STR and ITR behavior still needs to be improved.

Bad operation of the pilot´s G-suit making the pilot to start to black out starting at 6Gs.

Engine damage because of oil supply cut.

Engine stability during the different overloads, heights and pilot control. 2) Correct parameters of the flight model of the MiG-19P as released:



- The stall behavior was mostly correct.



From the real aircraft flight manual:



“…If the aircraft slows down to the speed of 280km/h (with the flaps and gear in) a slight vibration appears and the aircraft starts to oscillate laterally. As the speed decreases the vibrations increase.”



“…If the pilot pulls the stick smoothly after the nose drops down, the aircraft starts a shallow glide with a slight bank or not bank at all. The aircraft retains controllability in this glide at speeds between 250-270km/h. This behavior is the same regardless of gear and flaps being in or out.”



- Rotation speed during take-off.



Real MiG-19P: 230 km/h

DCS MiG-19P: 224 km/h (-3%)



- Take off speed. (Clean aircraft)



Real MiG-19P: 280 km/h

DCS MiG-19P: 278 km/h (-1%)



- Sustained turn at the altitude of 5.000 meters (5.4G)



Real MiG-19P: 31 seconds

DCS MiG-19P: 36 seconds (+16%)



- Max true airspeed (TAS)



Real MiG-19P: 1370 km/h

DCS MiG-19P: 1393 km/h (+2%)



- Landing speed



Real MiG-19P: 235 km/h

DCS MiG-19P: 230 km/h (-3.5%)



- Aircraft static ceiling



Real MiG-19P: 17.500 meters

DCS MiG-19P: 17.700 meters (+1%)

18.500 meters achieved dynamically.



- Aircraft range and endurance



Around 1390 km max and 1hr 43min without drop tanks.

Around 2200 km max and 2hr 38min with 760 lts drop tanks



These tests were performed with the engine working in NOMINAL at the height of 14.000 meters. The DCS version is within 4-6% of these values.



A dedicated chart with the different ranges and endurances per altitude will be made available in the flight manual.



- Roll speeds and roll and pitch inertia values



The roll speeds and inertia values are correct since release for the DCS MiG-19P aircraft, as these values are taken from the real aircraft performance manual and thereby included in the calculations.



- MP-100M Flight control G-limiter

This is an artificial stick effort device. It won´t allow the aircraft to go above 8G units during a maneuver. In real life, this device can be overridden if the pilot applies a considerable greater effort to pull the sitck.



- Aircraft trim law in all the range of speeds.



We decided to present the most important parameters for this report that were close or the same as the real aircraft, there´re a few more parameters like max time in Afterburner at different heights, fuel consumption, take-off speed with different loads, take-off at different engine regimes, ARU-2V Flight control system, etc., that were tested deeply and carefully and are correctly modeled since the release.





3) Work on the flight model continues:



The current flight model in testing and release candidate for the next update have been “cured” of many of the issues that were present at release. The new working features are:



a) Stall features:

Now the aircraft starts to vibrate as the speed decreases below 280km/h and will maintain the glide if the stick is not overpulled. In case that the stick is retained all the way back, the aircraft will roll over one wing and drop the nose.



https://www.youtube.com/watch?v=TaYQYdwTJKI



b) Spins

If during the stall, the stick is maintained all the way back, is suddenly pulled back, during the stall, turns or a loop, the aircraft will enter a spin or inverted spin. Any rudder movement during stalls its excessive use during turn will cause the aircraft to spin in the direction the rudder was used. The spin can be exited using especial measures that will be included in the flight manual.



This behavior is totally dynamic.



https://www.youtube.com/watch?v=ojAGk8LrmR8



https://www.youtube.com/watch?v=eOvbdBpP0ZE



c) Pilot G-suit has been improved. Now the pilot can sustain much greater Gs, close to 8 units without blacking out.



d) Engine thrust at MIL and airframe drag.

Engine thrust at MIL was completely reworked (as you will be able to see in the charts below). Now the aircraft is not able to super-cruise in level flight. However, be aware that when using MAX/MIL power setting the aircraft can break/graze the sound barrier in a shallow dive. This is correctly modeled based on real data.



e) The following charts have been made using a tool we have developed to assist in the accurate recreation of the flight models of present and future Razbam aircrafts. The tool was first used to create the FM of the DCS MiG-19P aircraft. It allows us to tune the simulated aircraft performance against the real aircraft charts. This will greatly increase the flight models development speed and accuracy.



NOTE: The dotted lines are the real life reference, taken from the aircraft performance manual. The continuous lines are from the simulated DCS MiG-19P aircraft.



Chart No.1 Longitudinal acceleration (nx) with the engine working in MIL and AB:









Chart No.2 Longitudinal deceleration (-nx) at the altitudes of 5300; 10.500 and 15.000 meters with and without airbrakes:







Chart No.3 Engine RPM variation with speed and altitude :









*The oscillations seen in the chart above are not present when tested in the simulation and were generated by the testing tool.





Chart No.4 Engine thrust in NOMINAL; MIL and AB based in speed and height:











f) As we were aware that some people in the community have doubts regarding the aircraft capacity to lose speed while airbraking, engine at IDLE, both with and without airbrakes, we want to explain this better.



The real aircraft performance charts indicate that it may take as much as 58 seconds with airbrakes and more than 100 seconds without them for an aircraft TAS to fall from 1.100 km/h to 600 km/h at the altitude of 5.300 meters. These values are even greater for higher altitudes.



g) The appearance and interaction with the cockpit illumination changes.



For the next update of the DCS MiG-19P; the cockpit lighting have been changed to work as how its real world counterpart was. There´s in general a total lack of information regarding all the variants of the MiG-19 and while we were able to get many and good quality manuals about the aircraft performance and systems as we have showed in the past, many other details like cockpit lighting, colors and some systems arrangement is hard to know. Thanks to the help of many knowledgeable individuals like foxbat155 and others we are getting to know all these important details better.



- ARUFOs-45 UV lamps models have been added.

- UV light intensity can be controlled by means of the RUFO-45 knobs, this being reflected in the cockpit.

- Phosphor based text changed from yellow to the correct green color.

- White light is independent of the UV lighting and can only be turned ON or OFF, no intensity control.

- Cockpit instruments that had its own yellow backlight added, like the AGI-1; AR18-19 radar control panel gauge, ARK-5P frequency range between others.















4) Rockets and bombs modes for the ASP-5N gunsight.



While the ASP-5N air to air cannon modes are working correctly, we still need to get into the air to ground modes for the rockets and bombs that currently are not working as they should.



First, the rockets mode should work the same as the cannons in RADAR mode for air targets. Rockets can be used for ground targets the same as the cannons in OPTIC mode, with the manual introduction of base (span) and distance. Several tables are used also, indicating the correct “lead” angle to be introduced in the gunsight; altitude and dive angle at which several types of rockets can be used.



Bombs mode for the ASP-5N gunsight is a simple method in which the reticle drops down in order for the pilot to have the reference of the aircraft longitudinal axis against the ground. “Lead” angles for the gunsight, release altitude and dive angle data is given in a table for the pilot.



All this is currently being worked for the sight to operate as intended and the manual changes to reflect this changes. Tables for the armament use will also be included.









In general this is the Razbam Simulations report regarding the current DCS MiG-19P status and the plan to make it better. We decided to get this approach because of the community concerns and feedback, so you can know firsthand what to expect from our modules, know their true state and don´t be misled by the lack of data and feelings. You can expect similar reports to be presented from time to time for every Razbam aircraft developed or in development.



Because of the complexity of the work required to develop aircraft modules for DCS, the sometimes lack of data and the fact that no human work is perfect, our products may never be fully featured and 98-100% close in performance to its real counterpart the day of its release.



We are really sorry for the misunderstandings in communication and we will prove that we learn from our mistakes with palpable facts. Starting today, expect a report of “present vs missing” features for any new Razbam release and also reports on the state of the missing features and its completion in present modules, and of course you can be sure that our current aircrafts will be made feature complete.





Well, now if you don´t mind, I will return to development…



Last edited by OverStratos; 03-21-2019 at 08:14 PM .