foxbat155

Pictures posted by me few posts earlier shows different rollerons, small proof that already missiles wasn't 100% interchangeable, lot of others parameters ( seeker gimbal limits, range, weight etc ) clearly show that those missiles differs and because of this parts cannot be placed each other ( maybe except screws ) . Those book stories are just kind of urban stories, some kind of memories colorization. True source is original manual. I don't judging which missile was better ( data shows that R-3S was slight better, but this really deciding in combat situation? ), but for me one thing is sure: Soviets appreciated AIM-9 simplificity, production easiness, and created own missile, tailored to they's own production and service standards. They copied ideas not missiles. Many modern technical devices are very simmilar, using many simmilar technical solutions but this not means that they are interchangeable.

Yes, Soviets got missiles from Chinese military, and they copied them - this way was created R-3. But very small number of those missiles were produced and they never were used in operational units. Soviets quick realized that AIM-9B have a lot of shortcommings and those can be improved. So keeping aerodynamical layout, they changed many internal things and R-3S show up. Conclusion is simple: R-3S is inspired by AIM-9B/R-3, not copied from.

Uncle Google is able find proofs in few seconds, technical description is achievable, lot of photos for compare technical differences. Everything what you need is time, and russian language knowledge. PRD-80A wasn't direct copy of Thiokol, is one from many Cold War myts. Soviet engine was shorter ( 1570 mm vs 1900 mm in AIM-9B ), burning time up to 3,2 sec ( AIM-9B - 2,2 sec ), max thrust impulse 38 kN vs 36,47 kN of AIM-9B. IR seeker gimbal limits +- 28 deg for R-3S, +- 25 deg for AIM-9B, R-3S max range 7,6 km, AIM-9B max range 4,8 km........ . AIM-9B rolleron. R-3S/R rolleron.

R-3S never was a direct copy of AIM-9B. R-3S missile got lot of changes, different warhead, totally new gas generator ( source of power on missile's aboard, prolonged systems life time from 11 to 21 seconds ), different body construction, changes in engine, and rollerons with totally new construction ( with after launch safety blokade which don't exist on the AIM-9B ). Only IR seeker retained without bigger changes . We can say that generally was a new missile inspired by AIM-9B. R-3 was strict copy of Sidewinder, but only few hundreds were produced, and she never saw regular service in units.

Fixed beam mode have two purposes: 1. In A-G mode, measuring distance to earth surface for rockets and canon use, 2. In A-A mode, measuring distance to air target in heavy jamming conditions, when RP-22 radar functionality is minimized ( all anti-jamming technics not working, most of them not present in module) then pilot switches radar to "fixed beam" mode and points whole aircraft to target in order to get distance readout. You never saw picture with R-55 because those missiles were never sold outside USSR, and even in USSR were in use mostly on Su-9 interceptor ( the plane for which they were created in the first place ).

Yep precisely how should look like. :thumbup: This is how should look home cockpit. This guy is my new idol since today:pilotfly:. This is good:

Thanks Toriy, I found this in my MiG-21UM manual. Yes aircraft have four red lights in total ( two on the IP, one left cockpit side, one right cockpit side ), and one white light which is use mostly only by ground service during night servicing and generally is disassembled from cockpit ( probably that's why LNS did white light without visible fixture ). All APN's with "console" knob, all S-60, S-80, SW, AGL with "instruments" knob, there is no distinction for left console, right console or instrument panel, all lights groups are activated by one dedicated knob in the same time. Yes this is thing pointed by Toriy, in two-seaters aircrafts flood light have additional switch "Manual-Auto". In manual mode flood light are operated by pilot by knob, in automatic mode ( and seems this default situation ) flood lights are emergency lights: if "instruments" lights electric installation will fail, then automatically red flood lights are on. I was looking in cockpit for this switch but no succes, maybe is hidden in one of service panels outside cockpit, but if manual mention about this, probably flood lights funcionality is the same like in two-seaters. This is SW light, part of "instruments" lighting. Yes, definitelly this is no easy to do, here IP example: Red circle - APN's lights, yellow - S-60, blue - S-80, pink - AGL, orange SW. But we have to remember that is no light simulation in cockpit, only textures. Already we have three groups of lights, they need only modification.

Yes, two-seaters had more white flood lights: two per cabin. On combat variants was only one white light on the right cockpit side, and yes was used mostly only for maintance stuff, that's why in most aircraft was dissassembled and is realy hard to find photo of cockpit with this light. I didn't know that red flood is emergency only, do you have any info about this from manual?.

If you will look closer, is clearly visible source of those lights: all those small posts around instruments and panel. I think that picture in post procesing got lower contrast, that's why difference is small. No, no flood lights on this picture. IP have only two flood lights (yellow circle), right beside radar's control box: On picture this place is completely dark and no visible cast from lights. Weapon panel is lighted (beside original post lights) by small light from device mounted on left side (red/blue circle). No idea what purpose have this thing, no information so far about. RSBN panel have five backlight lights (APN), those are connected with backlight rheostat on the right side of cockpit. Standard APN light used for backlight in many types of panel and control boxes in Soviet aircrafts.

"About two times" is a very wide and unprecise definition, in Polish AF this value was 1,7 what means that stall angle is ~19,5 deg. ( 33 deg. UUA-1 ). Even if 2 is true number this gives us about 16,5 deg, now in game we have 14 deg. Every 2-3 deg. is a big difference.

Nice try...., unfortunately CRT type is correct one: On that photo lights are definitely red. MiG-21's have АЧС-1М, so no internal lights, only heating. When I wrote "no connection with aircraft" I meant "no connection with lighting system", my fault, I was not enough precise.

I found photo how should look type 75B cockpit lights without flood lights ( text and instruments lights ). I took closer look on the radar CRT, and seems that only "Turn off" light is red, rest should be green ( or at least looks like green ).

Minimum sustained turns according manual: 1.Second reheat, weight 7500 kg, 0,5 Ma: - 1000 m (altitude) - 760 m (radius); - 2000 m - 880 m; - 3000 m - 960 m, 2.First reheat, weight 7500 kg, 0,5 Ma: - 1000 m - 870 m; - 3000 m - 1030 m; - 5000 m - 1320 m.

Screen hood looks perfect, historically realistic ( was one from three options: short, long, long with cumbersome ) and most practical from DCS point of view. Generally cockpit looks very promising. Thanks for update. :thumbup:

Some gauges have own post lighting, eg KPP. Here very good example how should look illumination (although photo is bit oversaturated): -yellow circle for texts backlight, -blue for instruments local lights, -green for red flood lights, -pink for white flood lights, here we have missed in Mig-21 lamp. Second photo posted by you ( front MiG-23UB cockpit ) is great example how should look illumination with only local lamps and texts backlights. Honestly, my knowledge about optics is really basic. But in my opinion focal lenght is related here. Diameter of fixed grid pattern (photo-etched plate) is about 1,5 smaller like lens, and probably that why lens have 200 mm, because grid picture need to be magnified. Here ASP-PFD optics schematics: Unfortunately my CAD software is basic, no plugins for assigning optical properties to objects.

Great news!, Thank you Overstratos.

This is sim, all stuff the same like in reality, no simplifications, nobody said that sim developing is easy. Not "would be" but must be. Those screens ( three first ) represent state without flood lights, yes you right with red flood lights on, fluorescent texts should be pinkish, but without flood lights should be green. Texts marked yellow works with illumination knob ( can be dimmer or lighter ) what is mistake. No, reflector cannot be tilted or moved from his position, need to be fixed at some constant values ( like distance from pilot's eyes, distance from gunsight's lens etc. ) because this guarantees proper aiming precision. I have precise 3D model of ASP-PFD in 1:1 scale, so I did few quick renders: View from pilot's point of view, 1,5 deg down and distance between pilot's eyes and reflector's surface about 700 mm. 10 deg. over normal view line. 10 deg. below normal view line. Pilot's eye's level, 10 deg right from normal view line. Those renders don't shows grid magnification by lens. Gunsight's lens have focal lenght 200 mm ( view angle 8,67 deg. ), distance beetwen reflector and lens is 77 mm, this means that grid reflection ( blue circle ) should be bigger about 7% like lens reflection ( red circle ).

Hi all, Lately I'm back to flying MiG-21, I did few night flights and I realize a few strange things in cockpit illumination: I marked yellow, texts which should not have red highlight, in real cockpit those texts are made as a print with fluorescent paint. Clock is a pure mechanical device and don't have any electrical connection with the aircraft and any battery inside. All scales and digits are painted with green fluorescent paint. Autopilot control panel don't have any highlight at all, but should be red. RL clock. ARK rotary control switch should be fluorescent green. Areas marked blue: they are red lights for highlighting instruments and small panels ( don't mistake with general flood lights), it's seems they not working or I'm wrong?. Orange marked space: where is source of this light?, I'm asking because according manual should be there SK-1WM light. Now gunsight's reflector. Compare to photos of RL device, first off all, lens reflection position is too low and is bigger like lens itself (green lines), and second this is size and position of fixed grid. According manual's drawings ( and logic because reflector glass is flat ) fixed grid reflection ( blue circle ) cannot be bigger like lens reflection ( red circle ), and moving grid cannot cross lens reflection borders.

Well, this depends from situation, one or two sockets can be in use. If service crew doing engine maintance and engine check runs, then only DC connector is in use, the same for engine start before flight. If some deeper maintance procedures have place, including avionics checks, then AC connector is in use as well. Generally from pilot's point of view most of time this is only DC socket, because he just need start engine, all routine preflight tests he doing with working engine so AC external source is no needed. Different story are maintance and overhauls works, technicians can't work with working engine so they have to use external power.

All variants have two sockets, only early aircraft have ( up to PFM ) one socket on the left fuselage side and second socket under fuselage right behind front undercarriage leg. Yes, to radar maintance external power is needed. In Soviet service practice, always any typical activity with aircraft's systems is done with external power use. If you will check pictures, aircrafts are always connected to some APA, or fixed generator ( some big airbases had fixed electrical and fuel infrastructure ). In Soviet service doctrine battery is considered as auxiliary/emergency source of power, used only in non typical situations.

MiG-21 have two electrical sockets for external power: one for DC (28V) and one for AC (115V). Any typical Soviet truck generator ( like older APA-50, APA-4 or newer APA-5, APA-80) is able provide full needed power for all systems.

Perfect explanation for perfect confusion: from about 9000 combat Mig-21 variants produced, only about 700-800 were Bis type 75b, so standard altimeter was VDI-30K because all that about 8200 aircrafts had some variation of Lazur system. At the service start all type 75b had VDI-30, but later during service many of them got standard altimeter VDI -30K ( because of malfunction, overhaul, service life expiry etc) . Both altimeters were functionally identical in main role, so no reason to not use K variant on type 75b.

OK guys, I found were is problem. Two seater variants of MiG-21 ( U,US,UM ) had different barometric altimeter - VD-28, and those in VD-28K variant have two markers, so looks like LN puted wrong altimeter into module. Photo: You can be sure Seb71 that I'm able spell vodka by W.:megalol:

Yea, should be VDI, I can't get used to english transliteration, letter V don't exist in russian and others slavic languages. Yes we should have in DCS VDI-30 without any triangles markers.

In real world MiG-21's barometric altimeter exist in two variants: WDI-30 and WDI-30K. Only difference between them is the command marker ( from Lazur system ) on the inner scale in that second one. Any others markers not exist, and here in DCS MiG-21 we should have WDI-30, because type 75B aircrafts don't have GCI. Here the picture of real WDI-30K: