Dr_Arrow Posted August 4, 2018 Posted August 4, 2018 I have already posted that L-39C AIs are too slow: https://forums.eagle.ru/showthread.php?t=209586 This is some serious AI flight model bug which prevents use of L-39c in any realistic manner in missions as wingman or other tasks (recon, aerobatics, training, etc.). If you set AI L-39C to fly for example at 5000 meters at 600 G/S, its speed will continuously drop up to 323 km/h IAS, which translates to 417 G/S at standard ISA atmosphere. The AI has its throttle at 99% and is flying at 5.7 degrees of AoA and cannot attain any higher speed than 323 km/h. See the attached picture: Why is it a bug?? Because the L-39c in clean config should not have any problem to maintain cruise at 5000m at 464 km/h IAS = 600 km/h GS at standard ISA and if you change the aircraft to L-39ZA, which is heavier and has the same engine and nearly the same airframe it has no problem to maintain the set ground speed, it uses 90% RPM and flies at 2.9 AoA: This regards only AI flight model, which is correct for the ZA but not working for the L-39C, which seriously limits the use of this aircraft in AI scenarios.
Dr_Arrow Posted August 15, 2018 Author Posted August 15, 2018 Still not fixed (or noticed) in the latest update - DCS 2.5.2.20601 Update 9 OB. I am also attaching a track showing flight of AI L-39C set to maintain 600 G/S at 5000m but barely managing 416 G/S with its throttle set to 99%, there must by something of in its AI flight model. AI L39-ZA is working fine, human L-39s are both working fine.L-39c_cruise_bug.trk
Dr_Arrow Posted August 16, 2018 Author Posted August 16, 2018 At 8000 meters AI is not capable of flying at all and will stall and fall out of the sky. Does this really bother no-one? At 8000 the aircraft is falling out of the sky, it seems like engine power is not well defined or L-39C AI is using some bad flight model. AI L-39C is unusable this way in campaigns or anywhere above 2000 meters.
Rowan Posted August 18, 2018 Posted August 18, 2018 (edited) I have noticed similar behavior in the recent past with other AI aircraft for example the M-2000. Edited August 18, 2018 by Rowan
Highwayman-Ed Posted August 23, 2018 Posted August 23, 2018 AI seems to suffer from this with many, many AI aircraft, it's not unique to the L-39. Sometimes they work, sometimes not. Setting up an AI S-3B Tanker is a prime example. Occasionally they will fly their orbit pattern at the desired speed, other times they'll only fly at 250Kts... Intel i9-9900KF @5.2GHz MSI Z390 Gaming Pro Carbon 32GB G.Skill Trident Z DDR3200 RAM MSI RTX 2080 Ti Gaming X Trio 40" Panasonic TH-40DX600U @ 4K Pimax Vision 8K Plus / Oculus Rift CV1 / HTC Vive Gametrix JetSeat with SimShaker Windows 10 64 Bit Home Edition [sIGPIC][/sIGPIC]
Shadow KT Posted August 24, 2018 Posted August 24, 2018 Let me guess, you spawn your AI in the air ? Yeah, spawning AI in the air seems to bug their speed and altitude. Try spawning them on an airfield and take-off, they should maintain their given parameters 'Shadow' Everybody gotta be offended and take it personally now-a-days
Dr_Arrow Posted August 24, 2018 Author Posted August 24, 2018 Let me guess, you spawn your AI in the air ? Yeah, spawning AI in the air seems to bug their speed and altitude. Try spawning them on an airfield and take-off, they should maintain their given parameters Unfortunately not, it is the same problem - AI is running at 99% throttle all the time and has even big problems to climb to 5000 meters. Seems like engine power at altitude is insufficient. L-39ZA works well.
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