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This report details inconsistencies in the DCS F/A-18C Hornet's flight model behavior, specifically Cl-δA (roll control effectiveness by the aileron) and Cn-δA (adverse yaw by the aileron) at high Angles of Attack (AOA), comparing public wind tunnel data by NASA. Issues: 1. Minimal Adverse Yaw: At high AOA (around 40-50 degrees), the aircraft exhibits minimal adverse yaw during aileron deflection. This is unrealistic, as real Hornets experience significant adverse yaw at these AOA due to asymmetric induced-drag generated by the aileron, according the Cn-δA chart from NASA. 2. Excessive Roll Control Authority: At high AOA, the ailerons appear to retain an unrealistic amount of roll control authority. Real F/A-18C Hornets experience a reduction by more than a half in roll control effectiveness at high AOA compared to those at 0 AOA, according the Cl-δA chart from NASA. Supporting Evidence: The report "AERODYNAMIC PARAMETERS OF HIGH-ANGLE-OF-ATTACK RESEARCH VEHICLE (HARV) ESTIMATED FROM FLIGHT DATA" (NASA TM 202692 with a link https://ntrs.nasa.gov/api/citations/19900019262/downloads/19900019262.pdf) provides real-world aerodynamic coefficient data relevant to the F/A-18C. Specifically, the following parameters are crucial: Cl-δA: This coefficient represents the rolling moment generated by the aileron deflection. A decrease in this value at high AOA signifies reduced roll control effectiveness. Cn-δA: This coefficient represents the yawing moment generated by the aileron deflection. A positive value at high AOA signifies adverse yaw. But be aware that the Cn contribution of differential stabs are not included in the NASA document, so the total amount of adverse yaw moement should be higher than a single Cn-δA. The data from this report can be used to compare with the current flight model's behavior and identify discrepancies. Testing Information: MSRM (manual spin recovery mode) is used for separate control surface manipulation. Turn on the MSRM switch to the rightside of the right DDI before testing. Thank you for your time and consideration. Video link: https://packaged-media.redd.it/uk23tvykr6uc1/pb/m2-res_480p.mp4?m=DASHPlaylist.mpd&v=1&e=1713337200&s=f9d5e02a332e95290ab60fe357a05fb884d866ab#t=0 F18 no adverse yaw at high AOA.trk
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- aileron
- correct as is
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a minor thing but since the april 24 patch the RWR BIT no longer works RWR-BIT_not-working.trk
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Hello, I created a mission with f18s and supercarrier in Caucacus.I saw on the SA page HAFU symbols from f18s even with EWR,radar,Dlink and IFF switches in OFF position !!. On the ground or carrierdeck and in the Air. My question is where does this symbols come from . -
correct as is Bug: Missing Radio Freqs for Bandar-e-Jask
Elphaba posted a topic in Bugs and Problems
Here's the entry in: \DCS World\Mods\terrains\PersianGulf\radio.lua { radioId = 'airfield21_0'; role = {"ground", "tower", "approach"}; callsign = {{["common"] = {_("Jask"), "Jask"}}}; frequency = {}; sceneObjects = {'t:82673668'}; }; However in the M.E. window you see this: Where is that data coming from if not from the radio.lua for the terrain pack?!
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As the titel says, the AGM 62 seems to be not available anymore for the Hornet. Could not find it in weapons. Activated the clock or not, no way. Has anyone information about the walleye ?
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So I had a Pylon shot off, George wouldnt fire on Target as the Missile that was showing on the Weapons page was readied on a pylon that no longer existing. It was my understanding that we could "Step" through to other Missiles. My intention was to Step through until a missile was readied on an existing Pylon. I set to MANUAL mode and pressed the button I had mapped for "Missile Advance" but it would not advance? I double checked the button assignment in the controls option and found it to be functional, but its not Advancing/Stepping? nullnullnull null
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This could be tangentially related to https://forum.dcs.world/topic/345045-fcs-wow-mode-after-fm-update For the Hornet, when taking off, 22 degrees of ANU is commanded mid-takeoff roll, and after weight-off-wheels one can find the stabs being commanded to 19 degrees NU well into 30 degrees of AoA. I did not include further moments of the track, but after 19 degrees of NU STABs is seen, the STABs would be "eased off" to ~11 degrees NU, and is immediately fixed or at least alleviated by (via keybinds) cycling the flaps from AUTO to HALF/FULL and back into AUTO, with a different resulting STAB position. I have the FCS page on my right DDI - those of you watching the track should be able to see it as well. Hornet AUTO takeoff flaps cycled.trk One should find the stabilators returning to approximately 3 degs NU upon cycling the flaps in the track attached. Throughout the process the gear is not raised nor did the airspeed exceed 250 kts. To test the reset logic itself: I have attempted a normal takeoff, STABs are commanded to ~14-15 degs ANU. After WoW I put flaps to AUTO, gear handle up, and then put the gear handle down again. At ~180kts IAS, STAB is at 2-3 degs NU. Hornet normal takeoff 180kts.trk The same occurs without putting the gear handle up in the first place. Hornet normal takeoff no gear-up 180kts.trk Then - a second takeoff with flaps in AUTO. The aforementioned 22 degrees ANU STABs is observed with aggressive pitch-up tendencies. I used full stick forward to try to counter this tendency but there is not enough authority to counteract this. Cycled flaps from AUTO to FULL and back to AUTO. No gear up, ~180kts, STAB is also at 2-3 degs NU. Hornet AUTO takeoff 180kts.trk A third takeoff with flaps set to FULL would still have the STABs on 22 degrees ANU, but when flaps is put back into AUTO without gear up, STAB is observed at 2-3 degs NU at ~180kts. Hornet FULL takeoff 180kts.trk The gear handle appears to have no influence on the trim reset logic. Putting flaps from non-AUTO to AUTO does. Cheers. -
correct as is Brakes not holding on MIL check (vs changelog)
Ahmed posted a topic in Bugs and Problems
Last changelog included: Fixed: Brake check holding at Mil power. However, they don't. The FCS commanding aft stabilator deflection to rotate the nose also looks suspicious, as the NATOPS technique states that the pilot must apply aft input at the nose wheel liftoff speed. brake_check.trk -
I can't say for sure when the Radalt would show in the Viper, but I can say that they only usually work to a max alt of 2500ft. It's not a major issue obviously but just another little addition to the realism. Cheers, Dr Spanklle
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Steps to replicate: Set A-G SMS select AG-65D. Set to PRE. Set right MFD to WPN Set left MFD to TGP. Set TGP to SOI. Set TGP to AUTO. Locate target Target designate SOI will change to WPN during handover. Additionally, TGP SNOWPLOW gets fixed to the horizontal plane and not at an angle to the ground when in TGP/AGM-65D. TGP Loses SOI When Targeting and WPN Active.trk
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correct as is F-16 Parking brake not working since last update
void68 posted a topic in Bugs and Problems
Bound the parking brake to a switch before, worked fine. Now hitting the switch in my homepit into upward position (PB) no upward switch position in the simulated cockpit. Checked it in Settings, the switch gives immediate and correct feedback "PARKINGBRAKE". However there are two entries, both are in orange? AntiSkid on/off positions however work like before. Changelog says: "Fixed: 3-way switch for ANTI-SKID/PB doesn't engage Parking Brake." Strange, I never had problems, it always engaged the Parking brake before. NOW it's broken. -
After latest update, it is become impossible to catch E-bracet during landing. Also, it is become impossible to hold aircraft on speed doing only throttle inputs. You need constantly correct aircraft vertically with a stick. I'm sure everyone is able to recreate this. -
No electric power when engines are at idle. Have to turn on APU.
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This can't be right. The accuracy or Circular Error Probable (CEP) of the GBU38 is as bad as a dumb bomb. The waypoint is from the editor, exactly in the middle of the tank X Y Z. https://streamable.com/pi8l3e F16 GBU38 CEP.trk
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Hello DCS community, Did you guys noticed the transition that is noticeable when the aircraft transitions from landing gains to cruise gains ? almost as if the aircraft wants to pitch up by itself ? Behaviour on ground: it really feels wrong, i do not have fighter time but i have jet engine time and the way the F-16 behaves on the ground feels really off, especially on landing with no wind, it is almost impossible to brake evenly and keep it straight on the runway, i almost always find myself skidding down the runway with one rudder pedal almost fully deflected while trying to brake. The airplane has in general a tendency to weer off the centerline, this is normal in most airplanes but here i feel it is exagerated. It is very hard to do aerodynamic breaking; especially for people who have FSSB sidestick, it requires a huge amount of back stick pressure to keep the nose in the air after landing .. too much if you ask me. In most airplanes you have to apply a bit of differential braking and at the same time some rudder inputs to keep it on the centerline, but here it really feels off. But in DCs i feel like i loose control of the airplane very easily on ground, airplanes don't skid like if they were on ice like that. other users feedback welcome and i would like to know what you think and if this is something ED could please have a look into it ? -
There are two accumulators inside the F-16 to start Jet Fuel Starter. If putting Jet fuel switch to START 1, it empties both - which is incorrect. Only when switching to START 2, should empty both at the same rate/time. f-16_JFS_start2_issue.trk
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As the title says. Only way to back to the nav point is by undesignating through the TGP, which is annoying if you haven't loaded one. Reproduction: - prep Miz with one steerpoint - Load bombs -take off - designate any location with AGR/GM - try to undesignate
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Good morning fellow pilots / DCS team, As the title indicates, my on-board gun no longer works when the FCR is active. I made a short video of it. And maybe that's how it should work, I'm curious about your ideas about this.
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![[31st] Spider](https://forum.dcs.world/uploads/monthly_2020_12/Spider.thumb.jpg.7aa9fd9a54acb8d8bb937d808464595d.jpg)
correct as is Loading weapons on fuselage stations
[31st] Spider posted a topic in Bugs and Problems
Since a few updates ago, I can no longer put a weapon on all stations 5, 6 and 7. When I load one on 6, and then on 5 or 7, the one on 6 is removed. If I put weapons on 5 and 7 and then on 6, the ones on 5 and 7 are gone. When I select a configuration with weapons on 5, 6 and 7 I made before the update that changed this, they are all loaded just fine. As long as I don't change any of the weapons on 5, 6 or 7. -
Hi ! Since the lighting in the F-16 is somewhat weird I don't know if it is working as intended or not but ... the wingtips red/green lights are always lit up even if you have the position switch on "off" The only way to turn it off is by rotating the master light knob to off or covert positions or turning the form lights knob all the way down. What is weird is that in either bright or dim position you can see the bulbs. In the off position, the bulbs are off but the lights are still there. The white bulb at the base of the vertical stab is working as intended ... It's been a while since I flown the Viper but I don't remember this working that way.
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I'm new to this module and actually jets altogether as I'm a warbird pilot so if this is a dumb question answer it anyway. After you change waypoints and make a turn towards the new one the instructor instructs you to make a new steer point using the HUD and TDC then pressing the TMS up once. This does nothing and the lesson will not continue. Any thoughts? I did make the MFD SOI and tried it using the cross and hitting the TMS to the right instead of up and I do get a box on the map but nothing on the HUD. Thanks!
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correct as is Mast bump more frequently after update
gonzolofogous posted a topic in Bugs and Problems
I'm experiencing mast bumping way more frequently after the March performance update. Even sometimes in level flight the rotor separates from the mast. I'll notice it's prominent going from a left bank to a right bank at about 40 kts with the same pitch input. Before the update, I would have to maneuver aggressively to induce a mast bump, but with this update, it seems to happen under normal flight characteristics. Any input would be appreciated, Tomcat 1-1 -
I have tested the AI Spitfire on both the Channel and Normandy maps , different heights, bomb loads. The bombs do Not explode. With the exact same ME settings, the other WW2 aircraft all drop and their bombs explode. Bomber test 1.miz Bomber test 2.miz
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I noticed that the SHOT reports when looked at will always display zulu time, regardless of the setting in the TSD->UTIL page. Is that correct?
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correct as is SHOW page's 'FCR TGTS/OBSTACLES' does nothing
LorenLuke posted a topic in Bugs and Problems
Title FCR Show Track.trk
