bkthunder Posted June 3, 2020 Posted June 3, 2020 According to this post, the F-16s HUD in DCS is displaying KEAS rather than KCAS. I've done a test myself and can confirm. This obviously leads to pretty big discrepancies in speed readings, with all associated consequences. Windows 10 - Intel i7 7700K 4.2 Ghz (no OC) - Asus Strix GTX 1080 8Gb - 16GB DDR4 (3000 MHz) - SSD 500GB + WD Black FZEX 1TB 6Gb/s
bkthunder Posted June 3, 2020 Author Posted June 3, 2020 IMPORTANT: KEAS instead of KCAS! Ok, we might have stumbled on something big. Kudos to the original poster on reddit Summary: It is very likely that ALL AIRCRAFT IN DCS DISPLAY KEAS INSTEAD OF KCAS on their digital insturments (i.e. HUD, MFDs etc) This could lead to FM issues if devs used those numbers thinking it was KCAS. Test: I just tested F-18, F-15, F-16. Mirage-2000, Su-27. Test parameters: Standard atmosphere No wind 35000ft Mach 0.9 or ~290 kts Equivalent Air Speed Pay attention: it turns out the speed displayed as "IAS" in the F2 inforbar is the Equivalent Air Speed. So, given 290kts EAS (from the infobar), we should have: KCAS: 310 kts KTAS: 518.5 kts GS: 518.5 kts (there's no wind) All parameters match, except KCAS displayed on the HUD of the different airplanes is 291 kts instead of 310 kts. That's 20kts difference, going to increase as speed and / or altitude increase. All calculations are based on this page http://www.aerospaceweb.org/design/scripts/atmosphere/ The very worrying part: Not sure if it's just a displayed speed issue, but if FMs are being made and tweaked based on what devs think is KCAS, but turns out it is actually KEAS, it could mean all FMs in the game are off. Example: I have personally tested and reported that the F-16's level acceleration at 10k feet and above is severly slower than IRL. The reports have been acknowledged. In some cases the timings were off by as much as 40%, so while there is still a high chance that the DCS F-16 is indeed undeperfroming, it might not be as bad as 40%, and if the speed displayed on the hud is taken as a measurment, the FM would result in a grossly over-powered F-16. I hope you get what I mean. @ED please check! Windows 10 - Intel i7 7700K 4.2 Ghz (no OC) - Asus Strix GTX 1080 8Gb - 16GB DDR4 (3000 MHz) - SSD 500GB + WD Black FZEX 1TB 6Gb/s
bkthunder Posted June 3, 2020 Author Posted June 3, 2020 Found out this is a general DCS bug. Posted here: https://forums.eagle.ru/showthread.php?t=276368 Windows 10 - Intel i7 7700K 4.2 Ghz (no OC) - Asus Strix GTX 1080 8Gb - 16GB DDR4 (3000 MHz) - SSD 500GB + WD Black FZEX 1TB 6Gb/s
JTFF - Raph Posted June 4, 2020 Posted June 4, 2020 +1 Modules: Nevada, Persian Gulf, Syria, Normandie, FC3, CA, Super Carrier, A-10C, A-10C II, F/A-18C, F-16 C, F-14 B, SA342, and WWII assets. Hardware: I7 8700K, Geforce GTX 1080Ti 11Go OC, 32Gb RAM, screen resolution 2K Devices: Hotas Warthog, Cougar MFDs, Saitek rudder pedals, Track IR
rrohde Posted June 4, 2020 Posted June 4, 2020 That's one of the occasions where I would love to see ED's Yo-Yo chime in. PC: AMD Ryzen 9 5950X | MSI Suprim GeForce 3090 TI | ASUS Prime X570-P | 128GB DDR4 3600 RAM | 2TB Samsung 870 EVO SSD | Win10 Pro 64bit Gear: HP Reverb G2 | JetPad FSE | VKB Gunfighter Pro Mk.III w/ MCG Ultimate VKBcontrollers.com
ED Team NineLine Posted June 4, 2020 ED Team Posted June 4, 2020 That's one of the occasions where I would love to see ED's Yo-Yo chime in. Yo-Yo isn't involved in this FM, but I have pinged the appropriate people :) Forum Rules • My YouTube • My Discord - NineLine#0440• **How to Report a Bug**
ED Team NineLine Posted June 4, 2020 ED Team Posted June 4, 2020 Thanks for the report guys, the team is actively looking into it. Forum Rules • My YouTube • My Discord - NineLine#0440• **How to Report a Bug**
bkthunder Posted June 5, 2020 Author Posted June 5, 2020 I personally PMd Yo-Yo, Kate and Wags about this. Yo-yo replied so I am sure they are aware. Important to note that this is not just about one particular modules, but it's sim-wise. Thinking about all the EM charts, analyses and comparisons the community has ran on these modules...jeez, those are all based on the wrong numbers! Hopefully 3rd party devs didn't trust the in-game speed readings when testing their FMs :doh: Windows 10 - Intel i7 7700K 4.2 Ghz (no OC) - Asus Strix GTX 1080 8Gb - 16GB DDR4 (3000 MHz) - SSD 500GB + WD Black FZEX 1TB 6Gb/s
ED Team NineLine Posted June 5, 2020 ED Team Posted June 5, 2020 I personally PMd Yo-Yo, Kate and Wags about this. Yo-yo replied so I am sure they are aware. Important to note that this is not just about one particular modules, but it's sim-wise. Thinking about all the EM charts, analyses and comparisons the community has ran on these modules...jeez, those are all based on the wrong numbers! Hopefully 3rd party devs didn't trust the in-game speed readings when testing their FMs :doh: Don't worry, the team is looking into it, Yo-Yo didn't seem as concerned with the stuff he works on, but possible its a bigger issue with more modern stuff, anyways when I hear something I will let you know. Forum Rules • My YouTube • My Discord - NineLine#0440• **How to Report a Bug**
ED Team NineLine Posted June 16, 2020 ED Team Posted June 16, 2020 Sorry it has been a bit, I am still waiting on an answer. I am told it is coming. Forum Rules • My YouTube • My Discord - NineLine#0440• **How to Report a Bug**
aSnatchyConman Posted June 17, 2020 Posted June 17, 2020 (edited) @bkthunder Not sure how to go about proving this but, I was the original poster on Reddit (u/espressoandcream). Appreciate you taking the discussion over here for the ED folks (glad that they're aware and investigating). Now that my account is actually activated on the ED forums, I'd be happy to help with any future data gathering/investigating. What can I say, my IRL job is flight testing F-16's. Makes sense that I do it in my spare time too. :D I'm pretty ignorant when it comes to flight models in DCS, but I can say from personal experience that something feels slightly "off" about the DCS F-16 when compared to real-world experience (hence why I was out doing the level accels that I mentioned on Reddit to gather data to compare to my own IRL experience). In addition to the obvious effects a bug like this would have on performance, I'm interested to see if there would be any trickle-down effects of using KEAS vs. KCAS, when it comes to stability & handling qualities. Probably not a whole lot at lower altitudes, but I can imagine there would be some noticeable difference up high. Hopefully I didn't open too big of a "can of worms" with this one. Thanks! Edited June 17, 2020 by aSnatchyConman
stormrider Posted June 17, 2020 Posted June 17, 2020 @bkthunder Not sure how to go about proving this but, I was the original poster on Reddit (u/espressoandcream). Appreciate you taking the discussion over here for the ED folks (glad that they're aware and investigating). Now that my account is actually activated on the ED forums, I'd be happy to help with any future data gathering/investigating. What can I say, my IRL job is flight testing F-16's. Makes sense that I do it in my spare time too. :D I'm pretty ignorant when it comes to flight models in DCS, but I can say from personal experience that something feels slightly "off" about the DCS F-16 when compared to real-world experience (hence why I was out doing the level accels that I mentioned on Reddit to gather data to compare to my own IRL experience). In addition to the obvious effects a bug like this would have on performance, I'm interested to see if there would be any trickle-down effects of using KEAS vs. KCAS, when it comes to stability & handling qualities. Probably not a whole lot at lower altitudes, but I can imagine there would be some noticeable difference up high. Hopefully I didn't open too big of a "can of worms" with this one. Thanks! Thank you. Banned by cunts.
bkthunder Posted June 19, 2020 Author Posted June 19, 2020 @bkthunder Not sure how to go about proving this but, I was the original poster on Reddit (u/espressoandcream). Appreciate you taking the discussion over here for the ED folks (glad that they're aware and investigating). Now that my account is actually activated on the ED forums, I'd be happy to help with any future data gathering/investigating. What can I say, my IRL job is flight testing F-16's. Makes sense that I do it in my spare time too. :D I'm pretty ignorant when it comes to flight models in DCS, but I can say from personal experience that something feels slightly "off" about the DCS F-16 when compared to real-world experience (hence why I was out doing the level accels that I mentioned on Reddit to gather data to compare to my own IRL experience). In addition to the obvious effects a bug like this would have on performance, I'm interested to see if there would be any trickle-down effects of using KEAS vs. KCAS, when it comes to stability & handling qualities. Probably not a whole lot at lower altitudes, but I can imagine there would be some noticeable difference up high. Hopefully I didn't open too big of a "can of worms" with this one. Thanks! Awesome, thanks for joining the discussion and, with your experience, hopefully ED will be listening. They sure have a history of being extremely reluctant to admit mistakes, maybe this time it'll be different. Personally I'm looking forward to your contributions here and a little envious of your awesome RL job :thumbup: Windows 10 - Intel i7 7700K 4.2 Ghz (no OC) - Asus Strix GTX 1080 8Gb - 16GB DDR4 (3000 MHz) - SSD 500GB + WD Black FZEX 1TB 6Gb/s
Nealius Posted June 24, 2020 Posted June 24, 2020 Does this affect the mach indicator as well? I've been wondering why I get sonic booms when at M0.98.
ED Team NineLine Posted June 24, 2020 ED Team Posted June 24, 2020 Just a small update, the team is putting together a bit of a report on DCS FMs as part of this discussion, when that gets closer I hope we will have an answer to this and more. Thanks guys. Forum Rules • My YouTube • My Discord - NineLine#0440• **How to Report a Bug**
Emmy Posted June 24, 2020 Posted June 24, 2020 Thanks for the update 9L... [sIGPIC][/sIGPIC] http://www.476vfightergroup.com/content.php High Quality Aviation Photography For Personal Enjoyment And Editorial Use. www.crosswindimages.com
stormrider Posted June 25, 2020 Posted June 25, 2020 Just a small update, the team is putting together a bit of a report on DCS FMs as part of this discussion, when that gets closer I hope we will have an answer to this and more. Thanks guys. Thank you. Banned by cunts.
Sideburns Posted July 16, 2020 Posted July 16, 2020 Any update on this? Ryzen 5800x@5Ghz | 96gb DDR4 3200Mhz | Asus Rx6800xt TUF OC | 500Gb OS SSD + 1TB Gaming SSD | Asus VG27AQ | Trackhat clip | VPC WarBRD base | Thrustmaster stick and throttle (Deltasim minijoystick mod). F14 | F16 | AJS37 | F5 | Av8b | FC3 | Mig21 | FW190D9 | Huey Been playing DCS from Flanker 2.0 to present
CoBlue Posted August 21, 2020 Posted August 21, 2020 Just a small update, the team is putting together a bit of a report on DCS FMs as part of this discussion, when that gets closer I hope we will have an answer to this and more. Thanks guys. All HUD-airplanes are showing KEAS in the HUD. ED has to change that. What speed is the DCS FMs based on? Did quick tests & the nr's are correct as per TS linked redit tests. When is this going to be a confirmed as a MAJOR BUG? Ok, we might have stumbled on something big. Kudos to the original poster on reddit Summary: It is very likely that ALL AIRCRAFT IN DCS DISPLAY KEAS INSTEAD OF KCAS on their digital insturments (i.e. HUD, MFDs etc) This could lead to FM issues if devs used those numbers thinking it was KCAS. Test: I just tested F-18, F-15, F-16. Mirage-2000, Su-27. Test parameters: Standard atmosphere No wind 35000ft Mach 0.9 or ~290 kts Equivalent Air Speed Pay attention: it turns out the speed displayed as "IAS" in the F2 inforbar is the Equivalent Air Speed. So, given 290kts EAS (from the infobar), we should have: KCAS: 310 kts KTAS: 518.5 kts GS: 518.5 kts (there's no wind) All parameters match, except KCAS displayed on the HUD of the different airplanes is 291 kts instead of 310 kts. That's 20kts difference, going to increase as speed and / or altitude increase. All calculations are based on this page http://www.aerospaceweb.org/design/scripts/atmosphere/ The very worrying part: Not sure if it's just a displayed speed issue, but if FMs are being made and tweaked based on what devs think is KCAS, but turns out it is actually KEAS, it could mean all FMs in the game are off. Example: I have personally tested and reported that the F-16's level acceleration at 10k feet and above is severly slower than IRL. The reports have been acknowledged. In some cases the timings were off by as much as 40%, so while there is still a high chance that the DCS F-16 is indeed undeperfroming, it might not be as bad as 40%, and if the speed displayed on the hud is taken as a measurment, the FM would result in a grossly over-powered F-16. I hope you get what I mean. @ED please check! Jepp, they'll have to redo ALL FM's & God knows what else? i7 8700k@4.7, 1080ti, DDR4 32GB, 2x SSD , HD 2TB, W10, ASUS 27", TrackIr5, TMWH, X-56, GProR.
dundun92 Posted August 21, 2020 Posted August 21, 2020 This has NOTHING to do with FMs, ED stated this clearly. It purely affects the numbers shown to us in the cockpit, nothing else Eagle Enthusiast, Fresco Fan. Patiently waiting for the F-15E. Clicky F-15C when? HP Z400 Workstation Intel Xeon W3680 (i7-980X) OC'd to 4.0 GHz, EVGA GTX 1060 6GB SSC Gaming, 24 GB DDR3 RAM, 500GB Crucial MX500 SSD. Thrustmaster T16000M FCS HOTAS, DIY opentrack head-tracking. I upload DCS videos here https://www.youtube.com/channel/UC0-7L3Z5nJ-QUX5M7Dh1pGg
CoBlue Posted August 21, 2020 Posted August 21, 2020 This has NOTHING to do with FMs, ED stated this clearly. It purely affects the numbers shown to us in the cockpit, nothing else Link? i7 8700k@4.7, 1080ti, DDR4 32GB, 2x SSD , HD 2TB, W10, ASUS 27", TrackIr5, TMWH, X-56, GProR.
Dee-Jay Posted August 22, 2020 Posted August 22, 2020 (edited) Hi! Test parameters: Standard atmosphere No wind 35000ft Mach 0.9 or ~290 kts Equivalent Air Speed Pay attention: it turns out the speed displayed as "IAS" in the F2 inforbar is the Equivalent Air Speed. So, given 290kts EAS (from the infobar), we should have: KCAS: 310 kts KTAS: 518.5 kts GS: 518.5 kts (there's no wind) All parameters match, except KCAS displayed on the HUD of the different airplanes is 291 kts instead of 310 kts. This has NOTHING to do with FMs, ED stated this clearly. It purely affects the numbers shown to us in the cockpit, nothing else To know if the airspeed in HUD vs info bar is correct, ... etc ... it is easy to be checked with two points on the map (known distance), an air temperature (defined in weather page), and a watch. Regards. Edited August 22, 2020 by Dee-Jay ASUSTeK ROG MAXIMUS X HERO / Intel Core i5-8600K (4.6 GHz) / NVIDIA GeForce RTX 3080 Ti FE 12GB / 32GB DDR4 Ballistix Elite 3200 MHz / Samsung SSD 970 EVO Plus 2TB / Be Quiet! Straight Power 11 1000W Platinum / Windows 10 Home 64-bit / HOTAS Cougar FSSB R1 (Warthog grip) / SIMPED / MFD Cougar / ViperGear ICP / SimShaker JetPad / Track IR 5 / Curved LED 27'' Monitor 1080p Samsung C27F396 / HP Reverb G2 VR Headset.
dundun92 Posted August 22, 2020 Posted August 22, 2020 Link? I see you didnt read the FM paper... https://forums.eagle.ru/showthread.php?t=281651 Eagle Enthusiast, Fresco Fan. Patiently waiting for the F-15E. Clicky F-15C when? HP Z400 Workstation Intel Xeon W3680 (i7-980X) OC'd to 4.0 GHz, EVGA GTX 1060 6GB SSC Gaming, 24 GB DDR3 RAM, 500GB Crucial MX500 SSD. Thrustmaster T16000M FCS HOTAS, DIY opentrack head-tracking. I upload DCS videos here https://www.youtube.com/channel/UC0-7L3Z5nJ-QUX5M7Dh1pGg
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